277 lines
7.2 KiB
Python
277 lines
7.2 KiB
Python
|
"""Utilities for writing code that runs on Python 2 and 3"""
|
||
|
|
||
|
# Copyright (c) 2010-2012 Benjamin Peterson
|
||
|
#
|
||
|
# Permission is hereby granted, free of charge, to any person obtaining a copy of
|
||
|
# this software and associated documentation files (the "Software"), to deal in
|
||
|
# the Software without restriction, including without limitation the rights to
|
||
|
# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
|
||
|
# the Software, and to permit persons to whom the Software is furnished to do so,
|
||
|
# subject to the following conditions:
|
||
|
#
|
||
|
# The above copyright notice and this permission notice shall be included in all
|
||
|
# copies or substantial portions of the Software.
|
||
|
#
|
||
|
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||
|
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
|
||
|
# FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
|
||
|
# COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
|
||
|
# IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
||
|
# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
||
|
|
||
|
import operator
|
||
|
import sys
|
||
|
import types
|
||
|
|
||
|
__author__ = "Benjamin Peterson <benjamin@python.org>"
|
||
|
__version__ = "1.2.0"
|
||
|
|
||
|
|
||
|
# True if we are running on Python 3.
|
||
|
PY3 = sys.version_info[0] == 3
|
||
|
|
||
|
if PY3:
|
||
|
string_types = str,
|
||
|
integer_types = int,
|
||
|
class_types = type,
|
||
|
text_type = str
|
||
|
binary_type = bytes
|
||
|
|
||
|
MAXSIZE = sys.maxsize
|
||
|
else:
|
||
|
string_types = basestring,
|
||
|
integer_types = (int, long)
|
||
|
class_types = (type, types.ClassType)
|
||
|
text_type = unicode
|
||
|
binary_type = str
|
||
|
|
||
|
if sys.platform.startswith("java"):
|
||
|
# Jython always uses 32 bits.
|
||
|
MAXSIZE = int((1 << 31) - 1)
|
||
|
else:
|
||
|
# It's possible to have sizeof(long) != sizeof(Py_ssize_t).
|
||
|
class X(object):
|
||
|
def __len__(self):
|
||
|
return 1 << 31
|
||
|
try:
|
||
|
len(X())
|
||
|
except OverflowError:
|
||
|
# 32-bit
|
||
|
MAXSIZE = int((1 << 31) - 1)
|
||
|
else:
|
||
|
# 64-bit
|
||
|
MAXSIZE = int((1 << 63) - 1)
|
||
|
del X
|
||
|
|
||
|
|
||
|
def _add_doc(func, doc):
|
||
|
"""Add documentation to a function."""
|
||
|
func.__doc__ = doc
|
||
|
|
||
|
|
||
|
def _import_module(name):
|
||
|
"""Import module, returning the module after the last dot."""
|
||
|
__import__(name)
|
||
|
return sys.modules[name]
|
||
|
|
||
|
|
||
|
# Replacement for lazy loading stuff in upstream six. See gh-2764
|
||
|
if PY3:
|
||
|
import builtins
|
||
|
import functools
|
||
|
reduce = functools.reduce
|
||
|
zip = builtins.zip
|
||
|
xrange = builtins.range
|
||
|
else:
|
||
|
import __builtin__
|
||
|
import itertools
|
||
|
builtins = __builtin__
|
||
|
reduce = __builtin__.reduce
|
||
|
zip = itertools.izip
|
||
|
xrange = __builtin__.xrange
|
||
|
|
||
|
|
||
|
if PY3:
|
||
|
_meth_func = "__func__"
|
||
|
_meth_self = "__self__"
|
||
|
|
||
|
_func_code = "__code__"
|
||
|
_func_defaults = "__defaults__"
|
||
|
|
||
|
_iterkeys = "keys"
|
||
|
_itervalues = "values"
|
||
|
_iteritems = "items"
|
||
|
else:
|
||
|
_meth_func = "im_func"
|
||
|
_meth_self = "im_self"
|
||
|
|
||
|
_func_code = "func_code"
|
||
|
_func_defaults = "func_defaults"
|
||
|
|
||
|
_iterkeys = "iterkeys"
|
||
|
_itervalues = "itervalues"
|
||
|
_iteritems = "iteritems"
|
||
|
|
||
|
|
||
|
try:
|
||
|
advance_iterator = next
|
||
|
except NameError:
|
||
|
def advance_iterator(it):
|
||
|
return it.next()
|
||
|
next = advance_iterator
|
||
|
|
||
|
|
||
|
if PY3:
|
||
|
def get_unbound_function(unbound):
|
||
|
return unbound
|
||
|
|
||
|
Iterator = object
|
||
|
|
||
|
def callable(obj):
|
||
|
return any("__call__" in klass.__dict__ for klass in type(obj).__mro__)
|
||
|
else:
|
||
|
def get_unbound_function(unbound):
|
||
|
return unbound.im_func
|
||
|
|
||
|
class Iterator(object):
|
||
|
|
||
|
def next(self):
|
||
|
return type(self).__next__(self)
|
||
|
|
||
|
callable = callable
|
||
|
_add_doc(get_unbound_function,
|
||
|
"""Get the function out of a possibly unbound function""")
|
||
|
|
||
|
|
||
|
get_method_function = operator.attrgetter(_meth_func)
|
||
|
get_method_self = operator.attrgetter(_meth_self)
|
||
|
get_function_code = operator.attrgetter(_func_code)
|
||
|
get_function_defaults = operator.attrgetter(_func_defaults)
|
||
|
|
||
|
|
||
|
def iterkeys(d):
|
||
|
"""Return an iterator over the keys of a dictionary."""
|
||
|
return iter(getattr(d, _iterkeys)())
|
||
|
|
||
|
|
||
|
def itervalues(d):
|
||
|
"""Return an iterator over the values of a dictionary."""
|
||
|
return iter(getattr(d, _itervalues)())
|
||
|
|
||
|
|
||
|
def iteritems(d):
|
||
|
"""Return an iterator over the (key, value) pairs of a dictionary."""
|
||
|
return iter(getattr(d, _iteritems)())
|
||
|
|
||
|
|
||
|
if PY3:
|
||
|
def b(s):
|
||
|
return s.encode("latin-1")
|
||
|
|
||
|
def u(s):
|
||
|
return s
|
||
|
|
||
|
if sys.version_info[1] <= 1:
|
||
|
def int2byte(i):
|
||
|
return bytes((i,))
|
||
|
else:
|
||
|
# This is about 2x faster than the implementation above on 3.2+
|
||
|
int2byte = operator.methodcaller("to_bytes", 1, "big")
|
||
|
import io
|
||
|
StringIO = io.StringIO
|
||
|
BytesIO = io.BytesIO
|
||
|
else:
|
||
|
def b(s):
|
||
|
return s
|
||
|
|
||
|
def u(s):
|
||
|
return unicode(s, "unicode_escape")
|
||
|
int2byte = chr
|
||
|
import StringIO
|
||
|
StringIO = BytesIO = StringIO.StringIO
|
||
|
_add_doc(b, """Byte literal""")
|
||
|
_add_doc(u, """Text literal""")
|
||
|
|
||
|
|
||
|
if PY3:
|
||
|
import builtins
|
||
|
exec_ = getattr(builtins, "exec")
|
||
|
|
||
|
def reraise(tp, value, tb=None):
|
||
|
if value.__traceback__ is not tb:
|
||
|
raise value.with_traceback(tb)
|
||
|
raise value
|
||
|
|
||
|
print_ = getattr(builtins, "print")
|
||
|
del builtins
|
||
|
|
||
|
else:
|
||
|
def exec_(code, globs=None, locs=None):
|
||
|
"""Execute code in a namespace."""
|
||
|
if globs is None:
|
||
|
frame = sys._getframe(1)
|
||
|
globs = frame.f_globals
|
||
|
if locs is None:
|
||
|
locs = frame.f_locals
|
||
|
del frame
|
||
|
elif locs is None:
|
||
|
locs = globs
|
||
|
exec("""exec code in globs, locs""")
|
||
|
|
||
|
exec_("""def reraise(tp, value, tb=None):
|
||
|
raise tp, value, tb
|
||
|
""")
|
||
|
|
||
|
def print_(*args, **kwargs):
|
||
|
"""The new-style print function."""
|
||
|
fp = kwargs.pop("file", sys.stdout)
|
||
|
if fp is None:
|
||
|
return
|
||
|
|
||
|
def write(data):
|
||
|
if not isinstance(data, basestring):
|
||
|
data = str(data)
|
||
|
fp.write(data)
|
||
|
want_unicode = False
|
||
|
sep = kwargs.pop("sep", None)
|
||
|
if sep is not None:
|
||
|
if isinstance(sep, unicode):
|
||
|
want_unicode = True
|
||
|
elif not isinstance(sep, str):
|
||
|
raise TypeError("sep must be None or a string")
|
||
|
end = kwargs.pop("end", None)
|
||
|
if end is not None:
|
||
|
if isinstance(end, unicode):
|
||
|
want_unicode = True
|
||
|
elif not isinstance(end, str):
|
||
|
raise TypeError("end must be None or a string")
|
||
|
if kwargs:
|
||
|
raise TypeError("invalid keyword arguments to print()")
|
||
|
if not want_unicode:
|
||
|
for arg in args:
|
||
|
if isinstance(arg, unicode):
|
||
|
want_unicode = True
|
||
|
break
|
||
|
if want_unicode:
|
||
|
newline = unicode("\n")
|
||
|
space = unicode(" ")
|
||
|
else:
|
||
|
newline = "\n"
|
||
|
space = " "
|
||
|
if sep is None:
|
||
|
sep = space
|
||
|
if end is None:
|
||
|
end = newline
|
||
|
for i, arg in enumerate(args):
|
||
|
if i:
|
||
|
write(sep)
|
||
|
write(arg)
|
||
|
write(end)
|
||
|
|
||
|
_add_doc(reraise, """Reraise an exception.""")
|
||
|
|
||
|
|
||
|
def with_metaclass(meta, base=object):
|
||
|
"""Create a base class with a metaclass."""
|
||
|
return meta("NewBase", (base,), {})
|