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v0.5.1
v0.5.1
https://github.com/python/cpython
Revision 2de91ba2ab02f914a6ea71f329d4efbe02293e9d authored by Edward Loper on 27 August 2004, 02:07:46 UTC, committed by Edward Loper on 27 August 2004, 02:07:46 UTC
- Improvements to interactive debugging support: - Changed the replacement pdb.set_trace to redirect stdout to the real stdout *only* during interactive debugging; stdout from code continues to go to the fake stdout. - When the interactive debugger gets to the end of an example, automatically continue. - Use a replacement linecache.getlines that will return source lines from doctest examples; this makes the source available to the debugger for interactive debugging. - In test_doctest, use a specialized _FakeOutput class instead of a temporary file to fake stdin for the interactive interpreter.
1 parent 8ce9f16
Tip revision: 2de91ba2ab02f914a6ea71f329d4efbe02293e9d authored by Edward Loper on 27 August 2004, 02:07:46 UTC
- Removed redundant call to expandtabs in DocTestParesr.
- Removed redundant call to expandtabs in DocTestParesr.
Tip revision: 2de91ba
weakref.py
"""Weak reference support for Python.
This module is an implementation of PEP 205:
http://python.sourceforge.net/peps/pep-0205.html
"""
# Naming convention: Variables named "wr" are weak reference objects;
# they are called this instead of "ref" to avoid name collisions with
# the module-global ref() function imported from _weakref.
import UserDict
from _weakref import \
getweakrefcount, \
getweakrefs, \
ref, \
proxy, \
CallableProxyType, \
ProxyType, \
ReferenceType
from exceptions import ReferenceError
ProxyTypes = (ProxyType, CallableProxyType)
__all__ = ["ref", "proxy", "getweakrefcount", "getweakrefs",
"WeakKeyDictionary", "ReferenceType", "ProxyType",
"CallableProxyType", "ProxyTypes", "WeakValueDictionary"]
class WeakValueDictionary(UserDict.UserDict):
"""Mapping class that references values weakly.
Entries in the dictionary will be discarded when no strong
reference to the value exists anymore
"""
# We inherit the constructor without worrying about the input
# dictionary; since it uses our .update() method, we get the right
# checks (if the other dictionary is a WeakValueDictionary,
# objects are unwrapped on the way out, and we always wrap on the
# way in).
def __init__(self, *args, **kw):
UserDict.UserDict.__init__(self, *args, **kw)
def remove(wr, selfref=ref(self)):
self = selfref()
if self is not None:
del self.data[wr.key]
self._remove = remove
def __getitem__(self, key):
o = self.data[key]()
if o is None:
raise KeyError, key
else:
return o
def __contains__(self, key):
try:
o = self.data[key]()
except KeyError:
return False
return o is not None
def has_key(self, key):
try:
o = self.data[key]()
except KeyError:
return False
return o is not None
def __repr__(self):
return "<WeakValueDictionary at %s>" % id(self)
def __setitem__(self, key, value):
self.data[key] = KeyedRef(value, self._remove, key)
def copy(self):
new = WeakValueDictionary()
for key, wr in self.data.items():
o = wr()
if o is not None:
new[key] = o
return new
def get(self, key, default=None):
try:
wr = self.data[key]
except KeyError:
return default
else:
o = wr()
if o is None:
# This should only happen
return default
else:
return o
def items(self):
L = []
for key, wr in self.data.items():
o = wr()
if o is not None:
L.append((key, o))
return L
def iteritems(self):
for wr in self.data.itervalues():
value = wr()
if value is not None:
yield wr.key, value
def iterkeys(self):
return self.data.iterkeys()
def __iter__(self):
return self.data.iterkeys()
def itervalues(self):
for wr in self.data.itervalues():
obj = wr()
if obj is not None:
yield obj
def popitem(self):
while 1:
key, wr = self.data.popitem()
o = wr()
if o is not None:
return key, o
def pop(self, key, *args):
try:
o = self.data.pop(key)()
except KeyError:
if args:
return args[0]
raise
if o is None:
raise KeyError, key
else:
return o
def setdefault(self, key, default=None):
try:
wr = self.data[key]
except KeyError:
self.data[key] = KeyedRef(default, self._remove, key)
return default
else:
return wr()
def update(self, dict=None, **kwargs):
d = self.data
if dict is not None:
if not hasattr(dict, "items"):
dict = type({})(dict)
for key, o in dict.items():
d[key] = KeyedRef(o, self._remove, key)
if len(kwargs):
self.update(kwargs)
def values(self):
L = []
for wr in self.data.values():
o = wr()
if o is not None:
L.append(o)
return L
class KeyedRef(ref):
"""Specialized reference that includes a key corresponding to the value.
This is used in the WeakValueDictionary to avoid having to create
a function object for each key stored in the mapping. A shared
callback object can use the 'key' attribute of a KeyedRef instead
of getting a reference to the key from an enclosing scope.
"""
__slots__ = "key",
def __new__(type, ob, callback, key):
self = ref.__new__(type, ob, callback)
self.key = key
return self
def __init__(self, ob, callback, key):
super(KeyedRef, self).__init__(ob, callback)
class WeakKeyDictionary(UserDict.UserDict):
""" Mapping class that references keys weakly.
Entries in the dictionary will be discarded when there is no
longer a strong reference to the key. This can be used to
associate additional data with an object owned by other parts of
an application without adding attributes to those objects. This
can be especially useful with objects that override attribute
accesses.
"""
def __init__(self, dict=None):
self.data = {}
def remove(k, selfref=ref(self)):
self = selfref()
if self is not None:
del self.data[k]
self._remove = remove
if dict is not None: self.update(dict)
def __delitem__(self, key):
del self.data[ref(key)]
def __getitem__(self, key):
return self.data[ref(key)]
def __repr__(self):
return "<WeakKeyDictionary at %s>" % id(self)
def __setitem__(self, key, value):
self.data[ref(key, self._remove)] = value
def copy(self):
new = WeakKeyDictionary()
for key, value in self.data.items():
o = key()
if o is not None:
new[o] = value
return new
def get(self, key, default=None):
return self.data.get(ref(key),default)
def has_key(self, key):
try:
wr = ref(key)
except TypeError:
return 0
return wr in self.data
def __contains__(self, key):
try:
wr = ref(key)
except TypeError:
return 0
return wr in self.data
def items(self):
L = []
for key, value in self.data.items():
o = key()
if o is not None:
L.append((o, value))
return L
def iteritems(self):
for wr, value in self.data.iteritems():
key = wr()
if key is not None:
yield key, value
def iterkeys(self):
for wr in self.data.iterkeys():
obj = wr()
if obj is not None:
yield obj
def __iter__(self):
return self.iterkeys()
def itervalues(self):
return self.data.itervalues()
def keys(self):
L = []
for wr in self.data.keys():
o = wr()
if o is not None:
L.append(o)
return L
def popitem(self):
while 1:
key, value = self.data.popitem()
o = key()
if o is not None:
return o, value
def pop(self, key, *args):
return self.data.pop(ref(key), *args)
def setdefault(self, key, default=None):
return self.data.setdefault(ref(key, self._remove),default)
def update(self, dict=None, **kwargs):
d = self.data
if dict is not None:
if not hasattr(dict, "items"):
dict = type({})(dict)
for key, value in dict.items():
d[ref(key, self._remove)] = value
if len(kwargs):
self.update(kwargs)
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