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v0.5.1
https://github.com/python/cpython
Revision 1c7b14197b10924e2efc1e6c99c720958be1f681 authored by Ned Deily on 08 October 2019, 02:13:04 UTC, committed by GitHub on 08 October 2019, 02:13:04 UTC
1 parent a6df224
Tip revision: 1c7b14197b10924e2efc1e6c99c720958be1f681 authored by Ned Deily on 08 October 2019, 02:13:04 UTC
Update macOS installer displays for 2.7.17rc1 (#16634)
Update macOS installer displays for 2.7.17rc1 (#16634)
Tip revision: 1c7b141
anydbm.py
"""Generic interface to all dbm clones.
Instead of
import dbm
d = dbm.open(file, 'w', 0666)
use
import anydbm
d = anydbm.open(file, 'w')
The returned object is a dbhash, gdbm, dbm or dumbdbm object,
dependent on the type of database being opened (determined by whichdb
module) in the case of an existing dbm. If the dbm does not exist and
the create or new flag ('c' or 'n') was specified, the dbm type will
be determined by the availability of the modules (tested in the above
order).
It has the following interface (key and data are strings):
d[key] = data # store data at key (may override data at
# existing key)
data = d[key] # retrieve data at key (raise KeyError if no
# such key)
del d[key] # delete data stored at key (raises KeyError
# if no such key)
flag = key in d # true if the key exists
list = d.keys() # return a list of all existing keys (slow!)
Future versions may change the order in which implementations are
tested for existence, and add interfaces to other dbm-like
implementations.
"""
class error(Exception):
pass
_names = ['dbhash', 'gdbm', 'dbm', 'dumbdbm']
_errors = [error]
_defaultmod = None
for _name in _names:
try:
_mod = __import__(_name)
except ImportError:
continue
if not _defaultmod:
_defaultmod = _mod
_errors.append(_mod.error)
if not _defaultmod:
raise ImportError, "no dbm clone found; tried %s" % _names
error = tuple(_errors)
def open(file, flag='r', mode=0666):
"""Open or create database at path given by *file*.
Optional argument *flag* can be 'r' (default) for read-only access, 'w'
for read-write access of an existing database, 'c' for read-write access
to a new or existing database, and 'n' for read-write access to a new
database.
Note: 'r' and 'w' fail if the database doesn't exist; 'c' creates it
only if it doesn't exist; and 'n' always creates a new database.
"""
# guess the type of an existing database
from whichdb import whichdb
result=whichdb(file)
if result is None:
# db doesn't exist
if 'c' in flag or 'n' in flag:
# file doesn't exist and the new
# flag was used so use default type
mod = _defaultmod
else:
raise error, "need 'c' or 'n' flag to open new db"
elif result == "":
# db type cannot be determined
raise error, "db type could not be determined"
else:
mod = __import__(result)
return mod.open(file, flag, mode)
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