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|
# util/compat.py
# Copyright (C) 2005-2013 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
try:
import threading
except ImportError:
import dummy_threading as threading
py32 = sys.version_info >= (3, 2)
py3k = sys.version_info >= (3, 0)
py2k = not py3k
jython = sys.platform.startswith('java')
pypy = hasattr(sys, 'pypy_version_info')
win32 = sys.platform.startswith('win')
cpython = not pypy and not jython # TODO: something better for this ?
next = next
if py3k:
import pickle
else:
try:
import pickle as pickle
except ImportError:
import pickle
if py3k:
import builtins
from inspect import getfullargspec as inspect_getfullargspec
from urllib.parse import quote_plus, unquote_plus, parse_qsl
import configparser
from io import StringIO
string_types = str,
binary_type = bytes
text_type = str
int_types = int,
iterbytes = iter
def u(s):
return s
def ue(s):
return s
def b(s):
return s.encode("latin-1")
if py32:
callable = callable
else:
def callable(fn):
return hasattr(fn, '__call__')
def cmp(a, b):
return (a > b) - (a < b)
from functools import reduce
print_ = getattr(builtins, "print")
import_ = getattr(builtins, '__import__')
import itertools
itertools_filterfalse = itertools.filterfalse
itertools_imap = map
else:
from inspect import getargspec as inspect_getfullargspec
from urllib import quote_plus, unquote_plus
from urlparse import parse_qsl
import ConfigParser as configparser
from StringIO import StringIO
string_types = basestring,
binary_type = str
text_type = unicode
int_types = int, long
def iterbytes(buf):
return (ord(byte) for byte in buf)
def u(s):
# this differs from what six does, which doesn't support non-ASCII
# strings - we only use u() with
# literal source strings, and all our source files with non-ascii
# in them (all are tests) are utf-8 encoded.
return unicode(s, "utf-8")
def ue(s):
return unicode(s, "unicode_escape")
def b(s):
return s
def import_(*args):
if len(args) == 4:
args = args[0:3] + ([str(arg) for arg in args[3]],)
return __import__(*args)
callable = callable
cmp = cmp
reduce = reduce
def print_(*args, **kwargs):
fp = kwargs.pop("file", sys.stdout)
if fp is None:
return
for arg in enumerate(args):
if not isinstance(arg, basestring):
arg = str(arg)
fp.write(arg)
import itertools
itertools_filterfalse = itertools.ifilterfalse
itertools_imap = itertools.imap
try:
from weakref import WeakSet
except:
import weakref
class WeakSet(object):
"""Implement the small subset of set() which SQLAlchemy needs
here. """
def __init__(self, values=None):
self._storage = weakref.WeakKeyDictionary()
if values is not None:
self._storage.update((value, None) for value in values)
def __iter__(self):
return iter(self._storage)
def union(self, other):
return WeakSet(set(self).union(other))
def add(self, other):
self._storage[other] = True
import time
if win32 or jython:
time_func = time.clock
else:
time_func = time.time
from collections import namedtuple
from operator import attrgetter as dottedgetter
if py3k:
def reraise(tp, value, tb=None, cause=None):
if cause is not None:
value.__cause__ = cause
if value.__traceback__ is not tb:
raise value.with_traceback(tb)
raise value
def raise_from_cause(exception, exc_info=None):
if exc_info is None:
exc_info = sys.exc_info()
exc_type, exc_value, exc_tb = exc_info
reraise(type(exception), exception, tb=exc_tb, cause=exc_value)
else:
exec("def reraise(tp, value, tb=None, cause=None):\n"
" raise tp, value, tb\n")
def raise_from_cause(exception, exc_info=None):
# not as nice as that of Py3K, but at least preserves
# the code line where the issue occurred
if exc_info is None:
exc_info = sys.exc_info()
exc_type, exc_value, exc_tb = exc_info
reraise(type(exception), exception, tb=exc_tb)
if py3k:
exec_ = getattr(builtins, 'exec')
else:
def exec_(func_text, globals_, lcl=None):
if lcl is None:
exec('exec func_text in globals_')
else:
exec('exec func_text in globals_, lcl')
def with_metaclass(meta, *bases):
"""Create a base class with a metaclass."""
return meta("MetaBase", bases, {})
|
