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# util/compat.py
# Copyright (C) 2005-2011 the SQLAlchemy authors and contributors <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php
"""Handle Python version/platform incompatibilities."""
import sys
# Py2K
import __builtin__
# end Py2K
try:
import threading
except ImportError:
import dummy_threading as threading
py32 = sys.version_info >= (3, 2)
py3k = getattr(sys, 'py3kwarning', False) or sys.version_info >= (3, 0)
jython = sys.platform.startswith('java')
pypy = hasattr(sys, 'pypy_version_info')
win32 = sys.platform.startswith('win')
if py3k:
set_types = set
elif sys.version_info < (2, 6):
import sets
set_types = set, sets.Set
else:
# 2.6 deprecates sets.Set, but we still need to be able to detect them
# in user code and as return values from DB-APIs
ignore = ('ignore', None, DeprecationWarning, None, 0)
import warnings
try:
warnings.filters.insert(0, ignore)
except Exception:
import sets
else:
import sets
warnings.filters.remove(ignore)
set_types = set, sets.Set
if py3k:
import pickle
else:
try:
import cPickle as pickle
except ImportError:
import pickle
# a controversial feature, required by MySQLdb currently
def buffer(x):
return x
# Py2K
buffer = getattr(__builtin__, 'buffer', buffer)
# end Py2K
try:
from functools import update_wrapper
except ImportError:
def update_wrapper(wrapper, wrapped,
assigned=('__doc__', '__module__', '__name__'),
updated=('__dict__',)):
for attr in assigned:
setattr(wrapper, attr, getattr(wrapped, attr))
for attr in updated:
getattr(wrapper, attr).update(getattr(wrapped, attr, ()))
return wrapper
try:
from functools import partial
except ImportError:
def partial(func, *args, **keywords):
def newfunc(*fargs, **fkeywords):
newkeywords = keywords.copy()
newkeywords.update(fkeywords)
return func(*(args + fargs), **newkeywords)
return newfunc
if py3k:
# they're bringing it back in 3.2. brilliant !
def callable(fn):
return hasattr(fn, '__call__')
def cmp(a, b):
return (a > b) - (a < b)
from functools import reduce
else:
callable = __builtin__.callable
cmp = __builtin__.cmp
reduce = __builtin__.reduce
try:
from collections import defaultdict
except ImportError:
class defaultdict(dict):
def __init__(self, default_factory=None, *a, **kw):
if (default_factory is not None and
not hasattr(default_factory, '__call__')):
raise TypeError('first argument must be callable')
dict.__init__(self, *a, **kw)
self.default_factory = default_factory
def __getitem__(self, key):
try:
return dict.__getitem__(self, key)
except KeyError:
return self.__missing__(key)
def __missing__(self, key):
if self.default_factory is None:
raise KeyError(key)
self[key] = value = self.default_factory()
return value
def __reduce__(self):
if self.default_factory is None:
args = tuple()
else:
args = self.default_factory,
return type(self), args, None, None, self.iteritems()
def copy(self):
return self.__copy__()
def __copy__(self):
return type(self)(self.default_factory, self)
def __deepcopy__(self, memo):
import copy
return type(self)(self.default_factory,
copy.deepcopy(self.items()))
def __repr__(self):
return 'defaultdict(%s, %s)' % (self.default_factory,
dict.__repr__(self))
# find or create a dict implementation that supports __missing__
class _probe(dict):
def __missing__(self, key):
return 1
try:
try:
_probe()['missing']
py25_dict = dict
except KeyError:
class py25_dict(dict):
def __getitem__(self, key):
try:
return dict.__getitem__(self, key)
except KeyError:
try:
missing = self.__missing__
except AttributeError:
raise KeyError(key)
else:
return missing(key)
finally:
del _probe
try:
import hashlib
_md5 = hashlib.md5
except ImportError:
import md5
_md5 = md5.new
def md5_hex(x):
# Py3K
#x = x.encode('utf-8')
m = _md5()
m.update(x)
return m.hexdigest()
import time
if win32 or jython:
time_func = time.clock
else:
time_func = time.time
if sys.version_info >= (2, 5):
def decode_slice(slc):
"""decode a slice object as sent to __getitem__.
takes into account the 2.5 __index__() method, basically.
"""
ret = []
for x in slc.start, slc.stop, slc.step:
if hasattr(x, '__index__'):
x = x.__index__()
ret.append(x)
return tuple(ret)
else:
def decode_slice(slc):
return (slc.start, slc.stop, slc.step)
if sys.version_info >= (2, 6):
from operator import attrgetter as dottedgetter
else:
def dottedgetter(attr):
def g(obj):
for name in attr.split("."):
obj = getattr(obj, name)
return obj
return g
import decimal
|
