Staging
v0.5.1
v0.5.1
https://github.com/python/cpython
Tip revision: 1f08c772f5a68bdf8309d6ad1cdddb838fc35feb authored by Larry Hastings on 03 August 2013, 19:58:12 UTC
Bumped version to 3.4.0a1.
Bumped version to 3.4.0a1.
Tip revision: 1f08c77
_bootstrap.py
"""Core implementation of import.
This module is NOT meant to be directly imported! It has been designed such
that it can be bootstrapped into Python as the implementation of import. As
such it requires the injection of specific modules and attributes in order to
work. One should use importlib as the public-facing version of this module.
"""
#
# IMPORTANT: Whenever making changes to this module, be sure to run
# a top-level make in order to get the frozen version of the module
# update. Not doing so will result in the Makefile to fail for
# all others who don't have a ./python around to freeze the module
# in the early stages of compilation.
#
# See importlib._setup() for what is injected into the global namespace.
# When editing this code be aware that code executed at import time CANNOT
# reference any injected objects! This includes not only global code but also
# anything specified at the class level.
# Bootstrap-related code ######################################################
_CASE_INSENSITIVE_PLATFORMS = 'win', 'cygwin', 'darwin'
def _make_relax_case():
if sys.platform.startswith(_CASE_INSENSITIVE_PLATFORMS):
def _relax_case():
"""True if filenames must be checked case-insensitively."""
return b'PYTHONCASEOK' in _os.environ
else:
def _relax_case():
"""True if filenames must be checked case-insensitively."""
return False
return _relax_case
def _w_long(x):
"""Convert a 32-bit integer to little-endian."""
return (int(x) & 0xFFFFFFFF).to_bytes(4, 'little')
def _r_long(int_bytes):
"""Convert 4 bytes in little-endian to an integer."""
return int.from_bytes(int_bytes, 'little')
def _path_join(*path_parts):
"""Replacement for os.path.join()."""
return path_sep.join([part.rstrip(path_separators)
for part in path_parts if part])
def _path_split(path):
"""Replacement for os.path.split()."""
if len(path_separators) == 1:
front, _, tail = path.rpartition(path_sep)
return front, tail
for x in reversed(path):
if x in path_separators:
front, tail = path.rsplit(x, maxsplit=1)
return front, tail
return '', path
def _path_is_mode_type(path, mode):
"""Test whether the path is the specified mode type."""
try:
stat_info = _os.stat(path)
except OSError:
return False
return (stat_info.st_mode & 0o170000) == mode
# XXX Could also expose Modules/getpath.c:isfile()
def _path_isfile(path):
"""Replacement for os.path.isfile."""
return _path_is_mode_type(path, 0o100000)
# XXX Could also expose Modules/getpath.c:isdir()
def _path_isdir(path):
"""Replacement for os.path.isdir."""
if not path:
path = _os.getcwd()
return _path_is_mode_type(path, 0o040000)
def _write_atomic(path, data, mode=0o666):
"""Best-effort function to write data to a path atomically.
Be prepared to handle a FileExistsError if concurrent writing of the
temporary file is attempted."""
# id() is used to generate a pseudo-random filename.
path_tmp = '{}.{}'.format(path, id(path))
fd = _os.open(path_tmp,
_os.O_EXCL | _os.O_CREAT | _os.O_WRONLY, mode & 0o666)
try:
# We first write data to a temporary file, and then use os.replace() to
# perform an atomic rename.
with _io.FileIO(fd, 'wb') as file:
file.write(data)
_os.replace(path_tmp, path)
except OSError:
try:
_os.unlink(path_tmp)
except OSError:
pass
raise
def _wrap(new, old):
"""Simple substitute for functools.update_wrapper."""
for replace in ['__module__', '__name__', '__qualname__', '__doc__']:
if hasattr(old, replace):
setattr(new, replace, getattr(old, replace))
new.__dict__.update(old.__dict__)
_code_type = type(_wrap.__code__)
# Module-level locking ########################################################
# A dict mapping module names to weakrefs of _ModuleLock instances
_module_locks = {}
# A dict mapping thread ids to _ModuleLock instances
_blocking_on = {}
class _DeadlockError(RuntimeError):
pass
class _ModuleLock:
"""A recursive lock implementation which is able to detect deadlocks
(e.g. thread 1 trying to take locks A then B, and thread 2 trying to
take locks B then A).
"""
def __init__(self, name):
self.lock = _thread.allocate_lock()
self.wakeup = _thread.allocate_lock()
self.name = name
self.owner = None
self.count = 0
self.waiters = 0
def has_deadlock(self):
# Deadlock avoidance for concurrent circular imports.
me = _thread.get_ident()
tid = self.owner
while True:
lock = _blocking_on.get(tid)
if lock is None:
return False
tid = lock.owner
if tid == me:
return True
def acquire(self):
"""
Acquire the module lock. If a potential deadlock is detected,
a _DeadlockError is raised.
Otherwise, the lock is always acquired and True is returned.
"""
tid = _thread.get_ident()
_blocking_on[tid] = self
try:
while True:
with self.lock:
if self.count == 0 or self.owner == tid:
self.owner = tid
self.count += 1
return True
if self.has_deadlock():
raise _DeadlockError('deadlock detected by %r' % self)
if self.wakeup.acquire(False):
self.waiters += 1
# Wait for a release() call
self.wakeup.acquire()
self.wakeup.release()
finally:
del _blocking_on[tid]
def release(self):
tid = _thread.get_ident()
with self.lock:
if self.owner != tid:
raise RuntimeError('cannot release un-acquired lock')
assert self.count > 0
self.count -= 1
if self.count == 0:
self.owner = None
if self.waiters:
self.waiters -= 1
self.wakeup.release()
def __repr__(self):
return '_ModuleLock({!r}) at {}'.format(self.name, id(self))
class _DummyModuleLock:
"""A simple _ModuleLock equivalent for Python builds without
multi-threading support."""
def __init__(self, name):
self.name = name
self.count = 0
def acquire(self):
self.count += 1
return True
def release(self):
if self.count == 0:
raise RuntimeError('cannot release un-acquired lock')
self.count -= 1
def __repr__(self):
return '_DummyModuleLock({!r}) at {}'.format(self.name, id(self))
# The following two functions are for consumption by Python/import.c.
def _get_module_lock(name):
"""Get or create the module lock for a given module name.
Should only be called with the import lock taken."""
lock = None
try:
lock = _module_locks[name]()
except KeyError:
pass
if lock is None:
if _thread is None:
lock = _DummyModuleLock(name)
else:
lock = _ModuleLock(name)
def cb(_):
del _module_locks[name]
_module_locks[name] = _weakref.ref(lock, cb)
return lock
def _lock_unlock_module(name):
"""Release the global import lock, and acquires then release the
module lock for a given module name.
This is used to ensure a module is completely initialized, in the
event it is being imported by another thread.
Should only be called with the import lock taken."""
lock = _get_module_lock(name)
_imp.release_lock()
try:
lock.acquire()
except _DeadlockError:
# Concurrent circular import, we'll accept a partially initialized
# module object.
pass
else:
lock.release()
# Frame stripping magic ###############################################
def _call_with_frames_removed(f, *args, **kwds):
"""remove_importlib_frames in import.c will always remove sequences
of importlib frames that end with a call to this function
Use it instead of a normal call in places where including the importlib
frames introduces unwanted noise into the traceback (e.g. when executing
module code)
"""
return f(*args, **kwds)
# Finder/loader utility code ###############################################
# Magic word to reject .pyc files generated by other Python versions.
# It should change for each incompatible change to the bytecode.
#
# The value of CR and LF is incorporated so if you ever read or write
# a .pyc file in text mode the magic number will be wrong; also, the
# Apple MPW compiler swaps their values, botching string constants.
#
# The magic numbers must be spaced apart at least 2 values, as the
# -U interpeter flag will cause MAGIC+1 being used. They have been
# odd numbers for some time now.
#
# There were a variety of old schemes for setting the magic number.
# The current working scheme is to increment the previous value by
# 10.
#
# Starting with the adoption of PEP 3147 in Python 3.2, every bump in magic
# number also includes a new "magic tag", i.e. a human readable string used
# to represent the magic number in __pycache__ directories. When you change
# the magic number, you must also set a new unique magic tag. Generally this
# can be named after the Python major version of the magic number bump, but
# it can really be anything, as long as it's different than anything else
# that's come before. The tags are included in the following table, starting
# with Python 3.2a0.
#
# Known values:
# Python 1.5: 20121
# Python 1.5.1: 20121
# Python 1.5.2: 20121
# Python 1.6: 50428
# Python 2.0: 50823
# Python 2.0.1: 50823
# Python 2.1: 60202
# Python 2.1.1: 60202
# Python 2.1.2: 60202
# Python 2.2: 60717
# Python 2.3a0: 62011
# Python 2.3a0: 62021
# Python 2.3a0: 62011 (!)
# Python 2.4a0: 62041
# Python 2.4a3: 62051
# Python 2.4b1: 62061
# Python 2.5a0: 62071
# Python 2.5a0: 62081 (ast-branch)
# Python 2.5a0: 62091 (with)
# Python 2.5a0: 62092 (changed WITH_CLEANUP opcode)
# Python 2.5b3: 62101 (fix wrong code: for x, in ...)
# Python 2.5b3: 62111 (fix wrong code: x += yield)
# Python 2.5c1: 62121 (fix wrong lnotab with for loops and
# storing constants that should have been removed)
# Python 2.5c2: 62131 (fix wrong code: for x, in ... in listcomp/genexp)
# Python 2.6a0: 62151 (peephole optimizations and STORE_MAP opcode)
# Python 2.6a1: 62161 (WITH_CLEANUP optimization)
# Python 2.7a0: 62171 (optimize list comprehensions/change LIST_APPEND)
# Python 2.7a0: 62181 (optimize conditional branches:
# introduce POP_JUMP_IF_FALSE and POP_JUMP_IF_TRUE)
# Python 2.7a0 62191 (introduce SETUP_WITH)
# Python 2.7a0 62201 (introduce BUILD_SET)
# Python 2.7a0 62211 (introduce MAP_ADD and SET_ADD)
# Python 3000: 3000
# 3010 (removed UNARY_CONVERT)
# 3020 (added BUILD_SET)
# 3030 (added keyword-only parameters)
# 3040 (added signature annotations)
# 3050 (print becomes a function)
# 3060 (PEP 3115 metaclass syntax)
# 3061 (string literals become unicode)
# 3071 (PEP 3109 raise changes)
# 3081 (PEP 3137 make __file__ and __name__ unicode)
# 3091 (kill str8 interning)
# 3101 (merge from 2.6a0, see 62151)
# 3103 (__file__ points to source file)
# Python 3.0a4: 3111 (WITH_CLEANUP optimization).
# Python 3.0a5: 3131 (lexical exception stacking, including POP_EXCEPT)
# Python 3.1a0: 3141 (optimize list, set and dict comprehensions:
# change LIST_APPEND and SET_ADD, add MAP_ADD)
# Python 3.1a0: 3151 (optimize conditional branches:
# introduce POP_JUMP_IF_FALSE and POP_JUMP_IF_TRUE)
# Python 3.2a0: 3160 (add SETUP_WITH)
# tag: cpython-32
# Python 3.2a1: 3170 (add DUP_TOP_TWO, remove DUP_TOPX and ROT_FOUR)
# tag: cpython-32
# Python 3.2a2 3180 (add DELETE_DEREF)
# Python 3.3a0 3190 __class__ super closure changed
# Python 3.3a0 3200 (__qualname__ added)
# 3210 (added size modulo 2**32 to the pyc header)
# Python 3.3a1 3220 (changed PEP 380 implementation)
# Python 3.3a4 3230 (revert changes to implicit __class__ closure)
# Python 3.4a1 3250 (evaluate positional default arguments before
# keyword-only defaults)
# Python 3.4a1 3260 (add LOAD_CLASSDEREF; allow locals of class to override
# free vars)
# Python 3.4a1 3270 (various tweaks to the __class__ closure)
# Python 3.4a1 3280 (remove implicit class argument)
#
# MAGIC must change whenever the bytecode emitted by the compiler may no
# longer be understood by older implementations of the eval loop (usually
# due to the addition of new opcodes).
MAGIC_NUMBER = (3280).to_bytes(2, 'little') + b'\r\n'
_RAW_MAGIC_NUMBER = int.from_bytes(MAGIC_NUMBER, 'little') # For import.c
_PYCACHE = '__pycache__'
SOURCE_SUFFIXES = ['.py'] # _setup() adds .pyw as needed.
DEBUG_BYTECODE_SUFFIXES = ['.pyc']
OPTIMIZED_BYTECODE_SUFFIXES = ['.pyo']
def cache_from_source(path, debug_override=None):
"""Given the path to a .py file, return the path to its .pyc/.pyo file.
The .py file does not need to exist; this simply returns the path to the
.pyc/.pyo file calculated as if the .py file were imported. The extension
will be .pyc unless sys.flags.optimize is non-zero, then it will be .pyo.
If debug_override is not None, then it must be a boolean and is used in
place of sys.flags.optimize.
If sys.implementation.cache_tag is None then NotImplementedError is raised.
"""
debug = not sys.flags.optimize if debug_override is None else debug_override
if debug:
suffixes = DEBUG_BYTECODE_SUFFIXES
else:
suffixes = OPTIMIZED_BYTECODE_SUFFIXES
head, tail = _path_split(path)
base_filename, sep, _ = tail.partition('.')
tag = sys.implementation.cache_tag
if tag is None:
raise NotImplementedError('sys.implementation.cache_tag is None')
filename = ''.join([base_filename, sep, tag, suffixes[0]])
return _path_join(head, _PYCACHE, filename)
def source_from_cache(path):
"""Given the path to a .pyc./.pyo file, return the path to its .py file.
The .pyc/.pyo file does not need to exist; this simply returns the path to
the .py file calculated to correspond to the .pyc/.pyo file. If path does
not conform to PEP 3147 format, ValueError will be raised. If
sys.implementation.cache_tag is None then NotImplementedError is raised.
"""
if sys.implementation.cache_tag is None:
raise NotImplementedError('sys.implementation.cache_tag is None')
head, pycache_filename = _path_split(path)
head, pycache = _path_split(head)
if pycache != _PYCACHE:
raise ValueError('{} not bottom-level directory in '
'{!r}'.format(_PYCACHE, path))
if pycache_filename.count('.') != 2:
raise ValueError('expected only 2 dots in '
'{!r}'.format(pycache_filename))
base_filename = pycache_filename.partition('.')[0]
return _path_join(head, base_filename + SOURCE_SUFFIXES[0])
def _get_sourcefile(bytecode_path):
"""Convert a bytecode file path to a source path (if possible).
This function exists purely for backwards-compatibility for
PyImport_ExecCodeModuleWithFilenames() in the C API.
"""
if len(bytecode_path) == 0:
return None
rest, _, extension = bytecode_path.rpartition('.')
if not rest or extension.lower()[-3:-1] != 'py':
return bytecode_path
try:
source_path = source_from_cache(bytecode_path)
except (NotImplementedError, ValueError):
source_path = bytecode_path[:-1]
return source_path if _path_isfile(source_path) else bytecode_path
def _calc_mode(path):
"""Calculate the mode permissions for a bytecode file."""
try:
mode = _os.stat(path).st_mode
except OSError:
mode = 0o666
# We always ensure write access so we can update cached files
# later even when the source files are read-only on Windows (#6074)
mode |= 0o200
return mode
def _verbose_message(message, *args, verbosity=1):
"""Print the message to stderr if -v/PYTHONVERBOSE is turned on."""
if sys.flags.verbose >= verbosity:
if not message.startswith(('#', 'import ')):
message = '# ' + message
print(message.format(*args), file=sys.stderr)
class _ManageReload:
def __init__(self, name):
self._name = name
def __enter__(self):
self._is_reload = self._name in sys.modules
def __exit__(self, *args):
if any(arg is not None for arg in args) and not self._is_reload:
try:
del sys.modules[self._name]
except KeyError:
pass
# Written as a class only because contextlib is not available.
class _ModuleManager(_ManageReload):
"""Context manager which returns the module to be loaded.
Does the proper unloading from sys.modules upon failure.
"""
def __init__(self, name, *, reset_name=True):
"""Prepare the context manager.
The reset_name argument specifies whether to unconditionally reset
the __name__ attribute if the module is found to be a reload.
"""
super().__init__(name)
self._reset_name = reset_name
def __enter__(self):
super().__enter__()
self._module = sys.modules.get(self._name)
if not self._is_reload:
# This must be done before open() is called as the 'io' module
# implicitly imports 'locale' and would otherwise trigger an
# infinite loop.
self._module = type(_io)(self._name)
# This must be done before putting the module in sys.modules
# (otherwise an optimization shortcut in import.c becomes wrong)
self._module.__initializing__ = True
sys.modules[self._name] = self._module
elif self._reset_name:
try:
self._module.__name__ = self._name
except AttributeError:
pass
return self._module
def __exit__(self, *args):
self._module.__initializing__ = False
del self._module
super().__exit__(*args)
def module_to_load(name, *, reset_name=True):
"""Return a context manager which provides the module object to load.
If reset_name is true, reset the module's __name__ to 'name'.
"""
# Hiding _ModuleManager behind a function for better naming.
return _ModuleManager(name, reset_name=reset_name)
def _init_package_attrs(loader, module):
"""Set __package__ and __path__ based on what loader.is_package() says."""
name = module.__name__
try:
is_package = loader.is_package(name)
except ImportError:
pass
else:
if is_package:
module.__package__ = name
module.__path__ = []
else:
module.__package__ = name.rpartition('.')[0]
def _init_file_attrs(loader, module):
"""Set __file__ and __path__ based on loader.get_filename()."""
try:
module.__file__ = loader.get_filename(module.__name__)
except ImportError:
pass
else:
if module.__name__ == module.__package__:
module.__path__.append(_path_split(module.__file__)[0])
def set_package(fxn):
"""Set __package__ on the returned module."""
def set_package_wrapper(*args, **kwargs):
module = fxn(*args, **kwargs)
if getattr(module, '__package__', None) is None:
module.__package__ = module.__name__
if not hasattr(module, '__path__'):
module.__package__ = module.__package__.rpartition('.')[0]
return module
_wrap(set_package_wrapper, fxn)
return set_package_wrapper
def set_loader(fxn):
"""Set __loader__ on the returned module."""
def set_loader_wrapper(self, *args, **kwargs):
module = fxn(self, *args, **kwargs)
if getattr(module, '__loader__', None) is None:
module.__loader__ = self
return module
_wrap(set_loader_wrapper, fxn)
return set_loader_wrapper
def _check_name(method):
"""Decorator to verify that the module being requested matches the one the
loader can handle.
The first argument (self) must define _name which the second argument is
compared against. If the comparison fails then ImportError is raised.
"""
def _check_name_wrapper(self, name=None, *args, **kwargs):
if name is None:
name = self.name
elif self.name != name:
raise ImportError('loader cannot handle %s' % name, name=name)
return method(self, name, *args, **kwargs)
_wrap(_check_name_wrapper, method)
return _check_name_wrapper
def _requires_builtin(fxn):
"""Decorator to verify the named module is built-in."""
def _requires_builtin_wrapper(self, fullname):
if fullname not in sys.builtin_module_names:
raise ImportError('{} is not a built-in module'.format(fullname),
name=fullname)
return fxn(self, fullname)
_wrap(_requires_builtin_wrapper, fxn)
return _requires_builtin_wrapper
def _requires_frozen(fxn):
"""Decorator to verify the named module is frozen."""
def _requires_frozen_wrapper(self, fullname):
if not _imp.is_frozen(fullname):
raise ImportError('{} is not a frozen module'.format(fullname),
name=fullname)
return fxn(self, fullname)
_wrap(_requires_frozen_wrapper, fxn)
return _requires_frozen_wrapper
def _find_module_shim(self, fullname):
"""Try to find a loader for the specified module by delegating to
self.find_loader()."""
# Call find_loader(). If it returns a string (indicating this
# is a namespace package portion), generate a warning and
# return None.
loader, portions = self.find_loader(fullname)
if loader is None and len(portions):
msg = 'Not importing directory {}: missing __init__'
_warnings.warn(msg.format(portions[0]), ImportWarning)
return loader
def _validate_bytecode_header(data, source_stats=None, name=None, path=None):
"""Validate the header of the passed-in bytecode against source_stats (if
given) and returning the bytecode that can be compiled by compile().
All other arguments are used to enhance error reporting.
ImportError is raised when the magic number is incorrect or the bytecode is
found to be stale. EOFError is raised when the data is found to be
truncated.
"""
exc_details = {}
if name is not None:
exc_details['name'] = name
else:
# To prevent having to make all messages have a conditional name.
name = '<bytecode>'
if path is not None:
exc_details['path'] = path
magic = data[:4]
raw_timestamp = data[4:8]
raw_size = data[8:12]
if magic != MAGIC_NUMBER:
message = 'bad magic number in {!r}: {!r}'.format(name, magic)
_verbose_message(message)
raise ImportError(message, **exc_details)
elif len(raw_timestamp) != 4:
message = 'reached EOF while reading timestamp in {!r}'.format(name)
_verbose_message(message)
raise EOFError(message)
elif len(raw_size) != 4:
message = 'reached EOF while reading size of source in {!r}'.format(name)
_verbose_message(message)
raise EOFError(message)
if source_stats is not None:
try:
source_mtime = int(source_stats['mtime'])
except KeyError:
pass
else:
if _r_long(raw_timestamp) != source_mtime:
message = 'bytecode is stale for {!r}'.format(name)
_verbose_message(message)
raise ImportError(message, **exc_details)
try:
source_size = source_stats['size'] & 0xFFFFFFFF
except KeyError:
pass
else:
if _r_long(raw_size) != source_size:
raise ImportError('bytecode is stale for {!r}'.format(name),
**exc_details)
return data[12:]
def _compile_bytecode(data, name=None, bytecode_path=None, source_path=None):
"""Compile bytecode as returned by _validate_bytecode_header()."""
code = marshal.loads(data)
if isinstance(code, _code_type):
_verbose_message('code object from {!r}', bytecode_path)
if source_path is not None:
_imp._fix_co_filename(code, source_path)
return code
else:
raise ImportError('Non-code object in {!r}'.format(bytecode_path),
name=name, path=bytecode_path)
def _code_to_bytecode(code, mtime=0, source_size=0):
"""Compile a code object into bytecode for writing out to a byte-compiled
file."""
data = bytearray(MAGIC_NUMBER)
data.extend(_w_long(mtime))
data.extend(_w_long(source_size))
data.extend(marshal.dumps(code))
return data
def decode_source(source_bytes):
"""Decode bytes representing source code and return the string.
Universal newline support is used in the decoding.
"""
import tokenize # To avoid bootstrap issues.
source_bytes_readline = _io.BytesIO(source_bytes).readline
encoding = tokenize.detect_encoding(source_bytes_readline)
newline_decoder = _io.IncrementalNewlineDecoder(None, True)
return newline_decoder.decode(source_bytes.decode(encoding[0]))
# Loaders #####################################################################
class BuiltinImporter:
"""Meta path import for built-in modules.
All methods are either class or static methods to avoid the need to
instantiate the class.
"""
@classmethod
def module_repr(cls, module):
return '<module {!r} (built-in)>'.format(module.__name__)
@classmethod
def find_module(cls, fullname, path=None):
"""Find the built-in module.
If 'path' is ever specified then the search is considered a failure.
"""
if path is not None:
return None
return cls if _imp.is_builtin(fullname) else None
@classmethod
@set_package
@set_loader
@_requires_builtin
def load_module(cls, fullname):
"""Load a built-in module."""
with _ManageReload(fullname):
return _call_with_frames_removed(_imp.init_builtin, fullname)
@classmethod
@_requires_builtin
def get_code(cls, fullname):
"""Return None as built-in modules do not have code objects."""
return None
@classmethod
@_requires_builtin
def get_source(cls, fullname):
"""Return None as built-in modules do not have source code."""
return None
@classmethod
@_requires_builtin
def is_package(cls, fullname):
"""Return False as built-in modules are never packages."""
return False
class FrozenImporter:
"""Meta path import for frozen modules.
All methods are either class or static methods to avoid the need to
instantiate the class.
"""
@classmethod
def module_repr(cls, m):
return '<module {!r} (frozen)>'.format(m.__name__)
@classmethod
def find_module(cls, fullname, path=None):
"""Find a frozen module."""
return cls if _imp.is_frozen(fullname) else None
@classmethod
@set_package
@set_loader
@_requires_frozen
def load_module(cls, fullname):
"""Load a frozen module."""
with _ManageReload(fullname):
m = _call_with_frames_removed(_imp.init_frozen, fullname)
# Let our own module_repr() method produce a suitable repr.
del m.__file__
return m
@classmethod
@_requires_frozen
def get_code(cls, fullname):
"""Return the code object for the frozen module."""
return _imp.get_frozen_object(fullname)
@classmethod
@_requires_frozen
def get_source(cls, fullname):
"""Return None as frozen modules do not have source code."""
return None
@classmethod
@_requires_frozen
def is_package(cls, fullname):
"""Return True if the frozen module is a package."""
return _imp.is_frozen_package(fullname)
class WindowsRegistryFinder:
"""Meta path finder for modules declared in the Windows registry.
"""
REGISTRY_KEY = (
'Software\\Python\\PythonCore\\{sys_version}'
'\\Modules\\{fullname}')
REGISTRY_KEY_DEBUG = (
'Software\\Python\\PythonCore\\{sys_version}'
'\\Modules\\{fullname}\\Debug')
DEBUG_BUILD = False # Changed in _setup()
@classmethod
def _open_registry(cls, key):
try:
return _winreg.OpenKey(_winreg.HKEY_CURRENT_USER, key)
except OSError:
return _winreg.OpenKey(_winreg.HKEY_LOCAL_MACHINE, key)
@classmethod
def _search_registry(cls, fullname):
if cls.DEBUG_BUILD:
registry_key = cls.REGISTRY_KEY_DEBUG
else:
registry_key = cls.REGISTRY_KEY
key = registry_key.format(fullname=fullname,
sys_version=sys.version[:3])
try:
with cls._open_registry(key) as hkey:
filepath = _winreg.QueryValue(hkey, '')
except OSError:
return None
return filepath
@classmethod
def find_module(cls, fullname, path=None):
"""Find module named in the registry."""
filepath = cls._search_registry(fullname)
if filepath is None:
return None
try:
_os.stat(filepath)
except OSError:
return None
for loader, suffixes, _ in _get_supported_file_loaders():
if filepath.endswith(tuple(suffixes)):
return loader(fullname, filepath)
class _LoaderBasics:
"""Base class of common code needed by both SourceLoader and
SourcelessFileLoader."""
def is_package(self, fullname):
"""Concrete implementation of InspectLoader.is_package by checking if
the path returned by get_filename has a filename of '__init__.py'."""
filename = _path_split(self.get_filename(fullname))[1]
filename_base = filename.rsplit('.', 1)[0]
tail_name = fullname.rpartition('.')[2]
return filename_base == '__init__' and tail_name != '__init__'
def init_module_attrs(self, module):
"""Set various attributes on the module.
ExecutionLoader.init_module_attrs() is used to set __loader__,
__package__, __file__, and optionally __path__. The __cached__ attribute
is set using imp.cache_from_source() and __file__.
"""
module.__loader__ = self # Loader
_init_package_attrs(self, module) # InspectLoader
_init_file_attrs(self, module) # ExecutionLoader
if hasattr(module, '__file__'): # SourceLoader
try:
module.__cached__ = cache_from_source(module.__file__)
except NotImplementedError:
pass
def load_module(self, fullname):
"""Load the specified module into sys.modules and return it."""
with module_to_load(fullname) as module:
self.init_module_attrs(module)
code = self.get_code(fullname)
if code is None:
raise ImportError('cannot load module {!r} when get_code() '
'returns None'.format(fullname))
_call_with_frames_removed(exec, code, module.__dict__)
return module
class SourceLoader(_LoaderBasics):
def path_mtime(self, path):
"""Optional method that returns the modification time (an int) for the
specified path, where path is a str.
Raises IOError when the path cannot be handled.
"""
raise IOError
def path_stats(self, path):
"""Optional method returning a metadata dict for the specified path
to by the path (str).
Possible keys:
- 'mtime' (mandatory) is the numeric timestamp of last source
code modification;
- 'size' (optional) is the size in bytes of the source code.
Implementing this method allows the loader to read bytecode files.
Raises IOError when the path cannot be handled.
"""
return {'mtime': self.path_mtime(path)}
def _cache_bytecode(self, source_path, cache_path, data):
"""Optional method which writes data (bytes) to a file path (a str).
Implementing this method allows for the writing of bytecode files.
The source path is needed in order to correctly transfer permissions
"""
# For backwards compatibility, we delegate to set_data()
return self.set_data(cache_path, data)
def set_data(self, path, data):
"""Optional method which writes data (bytes) to a file path (a str).
Implementing this method allows for the writing of bytecode files.
"""
def get_source(self, fullname):
"""Concrete implementation of InspectLoader.get_source."""
path = self.get_filename(fullname)
try:
source_bytes = self.get_data(path)
except OSError as exc:
raise ImportError('source not available through get_data()',
name=fullname) from exc
return decode_source(source_bytes)
def source_to_code(self, data, path, *, _optimize=-1):
"""Return the code object compiled from source.
The 'data' argument can be any object type that compile() supports.
"""
return _call_with_frames_removed(compile, data, path, 'exec',
dont_inherit=True, optimize=_optimize)
def get_code(self, fullname):
"""Concrete implementation of InspectLoader.get_code.
Reading of bytecode requires path_stats to be implemented. To write
bytecode, set_data must also be implemented.
"""
source_path = self.get_filename(fullname)
source_mtime = None
try:
bytecode_path = cache_from_source(source_path)
except NotImplementedError:
bytecode_path = None
else:
try:
st = self.path_stats(source_path)
except IOError:
pass
else:
source_mtime = int(st['mtime'])
try:
data = self.get_data(bytecode_path)
except OSError:
pass
else:
try:
bytes_data = _validate_bytecode_header(data,
source_stats=st, name=fullname,
path=bytecode_path)
except (ImportError, EOFError):
pass
else:
_verbose_message('{} matches {}', bytecode_path,
source_path)
return _compile_bytecode(bytes_data, name=fullname,
bytecode_path=bytecode_path,
source_path=source_path)
source_bytes = self.get_data(source_path)
code_object = self.source_to_code(source_bytes, source_path)
_verbose_message('code object from {}', source_path)
if (not sys.dont_write_bytecode and bytecode_path is not None and
source_mtime is not None):
data = _code_to_bytecode(code_object, source_mtime,
len(source_bytes))
try:
self._cache_bytecode(source_path, bytecode_path, data)
_verbose_message('wrote {!r}', bytecode_path)
except NotImplementedError:
pass
return code_object
class FileLoader:
"""Base file loader class which implements the loader protocol methods that
require file system usage."""
def __init__(self, fullname, path):
"""Cache the module name and the path to the file found by the
finder."""
self.name = fullname
self.path = path
@_check_name
def load_module(self, fullname):
"""Load a module from a file."""
# Issue #14857: Avoid the zero-argument form so the implementation
# of that form can be updated without breaking the frozen module
return super(FileLoader, self).load_module(fullname)
@_check_name
def get_filename(self, fullname):
"""Return the path to the source file as found by the finder."""
return self.path
def get_data(self, path):
"""Return the data from path as raw bytes."""
with _io.FileIO(path, 'r') as file:
return file.read()
class SourceFileLoader(FileLoader, SourceLoader):
"""Concrete implementation of SourceLoader using the file system."""
def path_stats(self, path):
"""Return the metadata for the path."""
st = _os.stat(path)
return {'mtime': st.st_mtime, 'size': st.st_size}
def _cache_bytecode(self, source_path, bytecode_path, data):
# Adapt between the two APIs
mode = _calc_mode(source_path)
return self.set_data(bytecode_path, data, _mode=mode)
def set_data(self, path, data, *, _mode=0o666):
"""Write bytes data to a file."""
parent, filename = _path_split(path)
path_parts = []
# Figure out what directories are missing.
while parent and not _path_isdir(parent):
parent, part = _path_split(parent)
path_parts.append(part)
# Create needed directories.
for part in reversed(path_parts):
parent = _path_join(parent, part)
try:
_os.mkdir(parent)
except FileExistsError:
# Probably another Python process already created the dir.
continue
except OSError as exc:
# Could be a permission error, read-only filesystem: just forget
# about writing the data.
_verbose_message('could not create {!r}: {!r}', parent, exc)
return
try:
_write_atomic(path, data, _mode)
_verbose_message('created {!r}', path)
except OSError as exc:
# Same as above: just don't write the bytecode.
_verbose_message('could not create {!r}: {!r}', path, exc)
class SourcelessFileLoader(FileLoader, _LoaderBasics):
"""Loader which handles sourceless file imports."""
def init_module_attrs(self, module):
super().init_module_attrs(module)
module.__cached__ = module.__file__
def get_code(self, fullname):
path = self.get_filename(fullname)
data = self.get_data(path)
bytes_data = _validate_bytecode_header(data, name=fullname, path=path)
return _compile_bytecode(bytes_data, name=fullname, bytecode_path=path)
def get_source(self, fullname):
"""Return None as there is no source code."""
return None
# Filled in by _setup().
EXTENSION_SUFFIXES = []
class ExtensionFileLoader:
"""Loader for extension modules.
The constructor is designed to work with FileFinder.
"""
def __init__(self, name, path):
self.name = name
self.path = path
@_check_name
@set_package
@set_loader
def load_module(self, fullname):
"""Load an extension module."""
with _ManageReload(fullname):
module = _call_with_frames_removed(_imp.load_dynamic,
fullname, self.path)
_verbose_message('extension module loaded from {!r}', self.path)
if self.is_package(fullname) and not hasattr(module, '__path__'):
module.__path__ = [_path_split(self.path)[0]]
return module
def is_package(self, fullname):
"""Return True if the extension module is a package."""
file_name = _path_split(self.path)[1]
return any(file_name == '__init__' + suffix
for suffix in EXTENSION_SUFFIXES)
def get_code(self, fullname):
"""Return None as an extension module cannot create a code object."""
return None
def get_source(self, fullname):
"""Return None as extension modules have no source code."""
return None
class _NamespacePath:
"""Represents a namespace package's path. It uses the module name
to find its parent module, and from there it looks up the parent's
__path__. When this changes, the module's own path is recomputed,
using path_finder. For top-level modules, the parent module's path
is sys.path."""
def __init__(self, name, path, path_finder):
self._name = name
self._path = path
self._last_parent_path = tuple(self._get_parent_path())
self._path_finder = path_finder
def _find_parent_path_names(self):
"""Returns a tuple of (parent-module-name, parent-path-attr-name)"""
parent, dot, me = self._name.rpartition('.')
if dot == '':
# This is a top-level module. sys.path contains the parent path.
return 'sys', 'path'
# Not a top-level module. parent-module.__path__ contains the
# parent path.
return parent, '__path__'
def _get_parent_path(self):
parent_module_name, path_attr_name = self._find_parent_path_names()
return getattr(sys.modules[parent_module_name], path_attr_name)
def _recalculate(self):
# If the parent's path has changed, recalculate _path
parent_path = tuple(self._get_parent_path()) # Make a copy
if parent_path != self._last_parent_path:
loader, new_path = self._path_finder(self._name, parent_path)
# Note that no changes are made if a loader is returned, but we
# do remember the new parent path
if loader is None:
self._path = new_path
self._last_parent_path = parent_path # Save the copy
return self._path
def __iter__(self):
return iter(self._recalculate())
def __len__(self):
return len(self._recalculate())
def __repr__(self):
return '_NamespacePath({!r})'.format(self._path)
def __contains__(self, item):
return item in self._recalculate()
def append(self, item):
self._path.append(item)
class NamespaceLoader:
def __init__(self, name, path, path_finder):
self._path = _NamespacePath(name, path, path_finder)
@classmethod
def module_repr(cls, module):
return '<module {!r} (namespace)>'.format(module.__name__)
def is_package(self, fullname):
return True
def get_source(self, fullname):
return ''
def get_code(self, fullname):
return compile('', '<string>', 'exec', dont_inherit=True)
def init_module_attrs(self, module):
module.__loader__ = self
module.__package__ = module.__name__
def load_module(self, fullname):
"""Load a namespace module."""
_verbose_message('namespace module loaded with path {!r}', self._path)
with module_to_load(fullname) as module:
self.init_module_attrs(module)
module.__path__ = self._path
return module
# Finders #####################################################################
class PathFinder:
"""Meta path finder for sys.path and package __path__ attributes."""
@classmethod
def invalidate_caches(cls):
"""Call the invalidate_caches() method on all path entry finders
stored in sys.path_importer_caches (where implemented)."""
for finder in sys.path_importer_cache.values():
if hasattr(finder, 'invalidate_caches'):
finder.invalidate_caches()
@classmethod
def _path_hooks(cls, path):
"""Search sequence of hooks for a finder for 'path'.
If 'hooks' is false then use sys.path_hooks.
"""
if not sys.path_hooks:
_warnings.warn('sys.path_hooks is empty', ImportWarning)
for hook in sys.path_hooks:
try:
return hook(path)
except ImportError:
continue
else:
return None
@classmethod
def _path_importer_cache(cls, path):
"""Get the finder for the path entry from sys.path_importer_cache.
If the path entry is not in the cache, find the appropriate finder
and cache it. If no finder is available, store None.
"""
if path == '':
path = '.'
try:
finder = sys.path_importer_cache[path]
except KeyError:
finder = cls._path_hooks(path)
sys.path_importer_cache[path] = finder
return finder
@classmethod
def _get_loader(cls, fullname, path):
"""Find the loader or namespace_path for this module/package name."""
# If this ends up being a namespace package, namespace_path is
# the list of paths that will become its __path__
namespace_path = []
for entry in path:
if not isinstance(entry, (str, bytes)):
continue
finder = cls._path_importer_cache(entry)
if finder is not None:
if hasattr(finder, 'find_loader'):
loader, portions = finder.find_loader(fullname)
else:
loader = finder.find_module(fullname)
portions = []
if loader is not None:
# We found a loader: return it immediately.
return loader, namespace_path
# This is possibly part of a namespace package.
# Remember these path entries (if any) for when we
# create a namespace package, and continue iterating
# on path.
namespace_path.extend(portions)
else:
return None, namespace_path
@classmethod
def find_module(cls, fullname, path=None):
"""Find the module on sys.path or 'path' based on sys.path_hooks and
sys.path_importer_cache."""
if path is None:
path = sys.path
loader, namespace_path = cls._get_loader(fullname, path)
if loader is not None:
return loader
else:
if namespace_path:
# We found at least one namespace path. Return a
# loader which can create the namespace package.
return NamespaceLoader(fullname, namespace_path, cls._get_loader)
else:
return None
class FileFinder:
"""File-based finder.
Interactions with the file system are cached for performance, being
refreshed when the directory the finder is handling has been modified.
"""
def __init__(self, path, *loader_details):
"""Initialize with the path to search on and a variable number of
2-tuples containing the loader and the file suffixes the loader
recognizes."""
loaders = []
for loader, suffixes in loader_details:
loaders.extend((suffix, loader) for suffix in suffixes)
self._loaders = loaders
# Base (directory) path
self.path = path or '.'
self._path_mtime = -1
self._path_cache = set()
self._relaxed_path_cache = set()
def invalidate_caches(self):
"""Invalidate the directory mtime."""
self._path_mtime = -1
find_module = _find_module_shim
def find_loader(self, fullname):
"""Try to find a loader for the specified module, or the namespace
package portions. Returns (loader, list-of-portions)."""
is_namespace = False
tail_module = fullname.rpartition('.')[2]
try:
mtime = _os.stat(self.path).st_mtime
except OSError:
mtime = -1
if mtime != self._path_mtime:
self._fill_cache()
self._path_mtime = mtime
# tail_module keeps the original casing, for __file__ and friends
if _relax_case():
cache = self._relaxed_path_cache
cache_module = tail_module.lower()
else:
cache = self._path_cache
cache_module = tail_module
# Check if the module is the name of a directory (and thus a package).
if cache_module in cache:
base_path = _path_join(self.path, tail_module)
if _path_isdir(base_path):
for suffix, loader in self._loaders:
init_filename = '__init__' + suffix
full_path = _path_join(base_path, init_filename)
if _path_isfile(full_path):
return (loader(fullname, full_path), [base_path])
else:
# A namespace package, return the path if we don't also
# find a module in the next section.
is_namespace = True
# Check for a file w/ a proper suffix exists.
for suffix, loader in self._loaders:
full_path = _path_join(self.path, tail_module + suffix)
_verbose_message('trying {}'.format(full_path), verbosity=2)
if cache_module + suffix in cache:
if _path_isfile(full_path):
return (loader(fullname, full_path), [])
if is_namespace:
_verbose_message('possible namespace for {}'.format(base_path))
return (None, [base_path])
return (None, [])
def _fill_cache(self):
"""Fill the cache of potential modules and packages for this directory."""
path = self.path
try:
contents = _os.listdir(path)
except (FileNotFoundError, PermissionError, NotADirectoryError):
# Directory has either been removed, turned into a file, or made
# unreadable.
contents = []
# We store two cached versions, to handle runtime changes of the
# PYTHONCASEOK environment variable.
if not sys.platform.startswith('win'):
self._path_cache = set(contents)
else:
# Windows users can import modules with case-insensitive file
# suffixes (for legacy reasons). Make the suffix lowercase here
# so it's done once instead of for every import. This is safe as
# the specified suffixes to check against are always specified in a
# case-sensitive manner.
lower_suffix_contents = set()
for item in contents:
name, dot, suffix = item.partition('.')
if dot:
new_name = '{}.{}'.format(name, suffix.lower())
else:
new_name = name
lower_suffix_contents.add(new_name)
self._path_cache = lower_suffix_contents
if sys.platform.startswith(_CASE_INSENSITIVE_PLATFORMS):
self._relaxed_path_cache = {fn.lower() for fn in contents}
@classmethod
def path_hook(cls, *loader_details):
"""A class method which returns a closure to use on sys.path_hook
which will return an instance using the specified loaders and the path
called on the closure.
If the path called on the closure is not a directory, ImportError is
raised.
"""
def path_hook_for_FileFinder(path):
"""Path hook for importlib.machinery.FileFinder."""
if not _path_isdir(path):
raise ImportError('only directories are supported', path=path)
return cls(path, *loader_details)
return path_hook_for_FileFinder
def __repr__(self):
return 'FileFinder({!r})'.format(self.path)
# Import itself ###############################################################
class _ImportLockContext:
"""Context manager for the import lock."""
def __enter__(self):
"""Acquire the import lock."""
_imp.acquire_lock()
def __exit__(self, exc_type, exc_value, exc_traceback):
"""Release the import lock regardless of any raised exceptions."""
_imp.release_lock()
def _resolve_name(name, package, level):
"""Resolve a relative module name to an absolute one."""
bits = package.rsplit('.', level - 1)
if len(bits) < level:
raise ValueError('attempted relative import beyond top-level package')
base = bits[0]
return '{}.{}'.format(base, name) if name else base
def _find_module(name, path):
"""Find a module's loader."""
if not sys.meta_path:
_warnings.warn('sys.meta_path is empty', ImportWarning)
for finder in sys.meta_path:
with _ImportLockContext():
loader = finder.find_module(name, path)
if loader is not None:
# The parent import may have already imported this module.
if name not in sys.modules:
return loader
else:
return sys.modules[name].__loader__
else:
return None
def _sanity_check(name, package, level):
"""Verify arguments are "sane"."""
if not isinstance(name, str):
raise TypeError('module name must be str, not {}'.format(type(name)))
if level < 0:
raise ValueError('level must be >= 0')
if package:
if not isinstance(package, str):
raise TypeError('__package__ not set to a string')
elif package not in sys.modules:
msg = ('Parent module {!r} not loaded, cannot perform relative '
'import')
raise SystemError(msg.format(package))
if not name and level == 0:
raise ValueError('Empty module name')
_ERR_MSG_PREFIX = 'No module named '
_ERR_MSG = _ERR_MSG_PREFIX + '{!r}'
def _find_and_load_unlocked(name, import_):
path = None
parent = name.rpartition('.')[0]
if parent:
if parent not in sys.modules:
_call_with_frames_removed(import_, parent)
# Crazy side-effects!
if name in sys.modules:
return sys.modules[name]
# Backwards-compatibility; be nicer to skip the dict lookup.
parent_module = sys.modules[parent]
try:
path = parent_module.__path__
except AttributeError:
msg = (_ERR_MSG + '; {} is not a package').format(name, parent)
raise ImportError(msg, name=name)
loader = _find_module(name, path)
if loader is None:
raise ImportError(_ERR_MSG.format(name), name=name)
elif name not in sys.modules:
# The parent import may have already imported this module.
loader.load_module(name)
_verbose_message('import {!r} # {!r}', name, loader)
# Backwards-compatibility; be nicer to skip the dict lookup.
module = sys.modules[name]
if parent:
# Set the module as an attribute on its parent.
parent_module = sys.modules[parent]
setattr(parent_module, name.rpartition('.')[2], module)
# Set __package__ if the loader did not.
if getattr(module, '__package__', None) is None:
try:
module.__package__ = module.__name__
if not hasattr(module, '__path__'):
module.__package__ = module.__package__.rpartition('.')[0]
except AttributeError:
pass
# Set loader if need be.
if getattr(module, '__loader__', None) is None:
try:
module.__loader__ = loader
except AttributeError:
pass
return module
def _find_and_load(name, import_):
"""Find and load the module, and release the import lock."""
try:
lock = _get_module_lock(name)
finally:
_imp.release_lock()
lock.acquire()
try:
return _find_and_load_unlocked(name, import_)
finally:
lock.release()
def _gcd_import(name, package=None, level=0):
"""Import and return the module based on its name, the package the call is
being made from, and the level adjustment.
This function represents the greatest common denominator of functionality
between import_module and __import__. This includes setting __package__ if
the loader did not.
"""
_sanity_check(name, package, level)
if level > 0:
name = _resolve_name(name, package, level)
_imp.acquire_lock()
if name not in sys.modules:
return _find_and_load(name, _gcd_import)
module = sys.modules[name]
if module is None:
_imp.release_lock()
message = ('import of {} halted; '
'None in sys.modules'.format(name))
raise ImportError(message, name=name)
_lock_unlock_module(name)
return module
def _handle_fromlist(module, fromlist, import_):
"""Figure out what __import__ should return.
The import_ parameter is a callable which takes the name of module to
import. It is required to decouple the function from assuming importlib's
import implementation is desired.
"""
# The hell that is fromlist ...
# If a package was imported, try to import stuff from fromlist.
if hasattr(module, '__path__'):
if '*' in fromlist:
fromlist = list(fromlist)
fromlist.remove('*')
if hasattr(module, '__all__'):
fromlist.extend(module.__all__)
for x in fromlist:
if not hasattr(module, x):
from_name = '{}.{}'.format(module.__name__, x)
try:
_call_with_frames_removed(import_, from_name)
except ImportError as exc:
# Backwards-compatibility dictates we ignore failed
# imports triggered by fromlist for modules that don't
# exist.
if str(exc).startswith(_ERR_MSG_PREFIX):
if exc.name == from_name:
continue
raise
return module
def _calc___package__(globals):
"""Calculate what __package__ should be.
__package__ is not guaranteed to be defined or could be set to None
to represent that its proper value is unknown.
"""
package = globals.get('__package__')
if package is None:
package = globals['__name__']
if '__path__' not in globals:
package = package.rpartition('.')[0]
return package
def _get_supported_file_loaders():
"""Returns a list of file-based module loaders.
Each item is a tuple (loader, suffixes, allow_packages).
"""
extensions = ExtensionFileLoader, _imp.extension_suffixes()
source = SourceFileLoader, SOURCE_SUFFIXES
bytecode = SourcelessFileLoader, BYTECODE_SUFFIXES
return [extensions, source, bytecode]
def __import__(name, globals=None, locals=None, fromlist=(), level=0):
"""Import a module.
The 'globals' argument is used to infer where the import is occuring from
to handle relative imports. The 'locals' argument is ignored. The
'fromlist' argument specifies what should exist as attributes on the module
being imported (e.g. ``from module import <fromlist>``). The 'level'
argument represents the package location to import from in a relative
import (e.g. ``from ..pkg import mod`` would have a 'level' of 2).
"""
if level == 0:
module = _gcd_import(name)
else:
globals_ = globals if globals is not None else {}
package = _calc___package__(globals_)
module = _gcd_import(name, package, level)
if not fromlist:
# Return up to the first dot in 'name'. This is complicated by the fact
# that 'name' may be relative.
if level == 0:
return _gcd_import(name.partition('.')[0])
elif not name:
return module
else:
# Figure out where to slice the module's name up to the first dot
# in 'name'.
cut_off = len(name) - len(name.partition('.')[0])
# Slice end needs to be positive to alleviate need to special-case
# when ``'.' not in name``.
return sys.modules[module.__name__[:len(module.__name__)-cut_off]]
else:
return _handle_fromlist(module, fromlist, _gcd_import)
def _setup(sys_module, _imp_module):
"""Setup importlib by importing needed built-in modules and injecting them
into the global namespace.
As sys is needed for sys.modules access and _imp is needed to load built-in
modules, those two modules must be explicitly passed in.
"""
global _imp, sys, BYTECODE_SUFFIXES
_imp = _imp_module
sys = sys_module
if sys.flags.optimize:
BYTECODE_SUFFIXES = OPTIMIZED_BYTECODE_SUFFIXES
else:
BYTECODE_SUFFIXES = DEBUG_BYTECODE_SUFFIXES
module_type = type(sys)
for name, module in sys.modules.items():
if isinstance(module, module_type):
if getattr(module, '__loader__', None) is None:
if name in sys.builtin_module_names:
module.__loader__ = BuiltinImporter
elif _imp.is_frozen(name):
module.__loader__ = FrozenImporter
self_module = sys.modules[__name__]
for builtin_name in ('_io', '_warnings', 'builtins', 'marshal'):
if builtin_name not in sys.modules:
builtin_module = BuiltinImporter.load_module(builtin_name)
else:
builtin_module = sys.modules[builtin_name]
setattr(self_module, builtin_name, builtin_module)
os_details = ('posix', ['/']), ('nt', ['\\', '/'])
for builtin_os, path_separators in os_details:
# Assumption made in _path_join()
assert all(len(sep) == 1 for sep in path_separators)
path_sep = path_separators[0]
if builtin_os in sys.modules:
os_module = sys.modules[builtin_os]
break
else:
try:
os_module = BuiltinImporter.load_module(builtin_os)
break
except ImportError:
continue
else:
raise ImportError('importlib requires posix or nt')
try:
thread_module = BuiltinImporter.load_module('_thread')
except ImportError:
# Python was built without threads
thread_module = None
weakref_module = BuiltinImporter.load_module('_weakref')
if builtin_os == 'nt':
winreg_module = BuiltinImporter.load_module('winreg')
setattr(self_module, '_winreg', winreg_module)
setattr(self_module, '_os', os_module)
setattr(self_module, '_thread', thread_module)
setattr(self_module, '_weakref', weakref_module)
setattr(self_module, 'path_sep', path_sep)
setattr(self_module, 'path_separators', ''.join(path_separators))
# Constants
setattr(self_module, '_relax_case', _make_relax_case())
EXTENSION_SUFFIXES.extend(_imp.extension_suffixes())
if builtin_os == 'nt':
SOURCE_SUFFIXES.append('.pyw')
if '_d.pyd' in EXTENSION_SUFFIXES:
WindowsRegistryFinder.DEBUG_BUILD = True
def _install(sys_module, _imp_module):
"""Install importlib as the implementation of import."""
_setup(sys_module, _imp_module)
supported_loaders = _get_supported_file_loaders()
sys.path_hooks.extend([FileFinder.path_hook(*supported_loaders)])
sys.meta_path.append(BuiltinImporter)
sys.meta_path.append(FrozenImporter)
if _os.__name__ == 'nt':
sys.meta_path.append(WindowsRegistryFinder)
sys.meta_path.append(PathFinder)
