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637 lines (520 loc) · 22.6 KB
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"""Utilities for writing code that runs on Python 2 and 3"""
# Copyright (c) 2010-2014 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.
importoperator
importsys
importtypes
__author__="Benjamin Peterson <benjamin@python.org>"
__version__="1.5.2"
# Useful for very coarse version differentiation.
PY2=sys.version_info[0] ==2
PY3=sys.version_info[0] ==3
ifPY3:
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
ifsys.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).
classX(object):
def__len__(self):
return1<<31
try:
len(X())
exceptOverflowError:
# 32-bit
MAXSIZE=int((1<<31) -1)
else:
# 64-bit
MAXSIZE=int((1<<63) -1)
delX
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)
returnsys.modules[name]
class_LazyDescr(object):
def__init__(self, name):
self.name=name
def__get__(self, obj, tp):
result=self._resolve()
setattr(obj, self.name, result) # Invokes __set__.
# This is a bit ugly, but it avoids running this again.
delattr(obj.__class__, self.name)
returnresult
classMovedModule(_LazyDescr):
def__init__(self, name, old, new=None):
super(MovedModule, self).__init__(name)
ifPY3:
ifnewisNone:
new=name
self.mod=new
else:
self.mod=old
def_resolve(self):
return_import_module(self.mod)
def__getattr__(self, attr):
# Hack around the Django autoreloader. The reloader tries to get
# __file__ or __name__ of every module in sys.modules. This doesn't work
# well if this MovedModule is for an module that is unavailable on this
# machine (like winreg on Unix systems). Thus, we pretend __file__ and
# __name__ don't exist if the module hasn't been loaded yet. We give
# __path__ the same treatment for Google AppEngine. See issues #51, #53
# and #56.
if (attrin ("__file__", "__name__", "__path__") and
self.modnotinsys.modules):
raiseAttributeError
_module=self._resolve()
value=getattr(_module, attr)
setattr(self, attr, value)
returnvalue
class_LazyModule(types.ModuleType):
def__init__(self, name):
super(_LazyModule, self).__init__(name)
self.__doc__=self.__class__.__doc__
def__dir__(self):
attrs= ["__doc__", "__name__"]
attrs+= [attr.nameforattrinself._moved_attributes]
returnattrs
# Subclasses should override this
_moved_attributes= []
classMovedAttribute(_LazyDescr):
def__init__(self, name, old_mod, new_mod, old_attr=None, new_attr=None):
super(MovedAttribute, self).__init__(name)
ifPY3:
ifnew_modisNone:
new_mod=name
self.mod=new_mod
ifnew_attrisNone:
ifold_attrisNone:
new_attr=name
else:
new_attr=old_attr
self.attr=new_attr
else:
self.mod=old_mod
ifold_attrisNone:
old_attr=name
self.attr=old_attr
def_resolve(self):
module=_import_module(self.mod)
returngetattr(module, self.attr)
class_MovedItems(_LazyModule):
"""Lazy loading of moved objects"""
_moved_attributes= [
MovedAttribute("cStringIO", "cStringIO", "io", "StringIO"),
MovedAttribute("filter", "itertools", "builtins", "ifilter", "filter"),
MovedAttribute("filterfalse", "itertools", "itertools", "ifilterfalse", "filterfalse"),
MovedAttribute("input", "__builtin__", "builtins", "raw_input", "input"),
MovedAttribute("map", "itertools", "builtins", "imap", "map"),
MovedAttribute("range", "__builtin__", "builtins", "xrange", "range"),
MovedAttribute("reload_module", "__builtin__", "imp", "reload"),
MovedAttribute("reduce", "__builtin__", "functools"),
MovedAttribute("StringIO", "StringIO", "io"),
MovedAttribute("UserString", "UserString", "collections"),
MovedAttribute("xrange", "__builtin__", "builtins", "xrange", "range"),
MovedAttribute("zip", "itertools", "builtins", "izip", "zip"),
MovedAttribute("zip_longest", "itertools", "itertools", "izip_longest", "zip_longest"),
MovedModule("builtins", "__builtin__"),
MovedModule("configparser", "ConfigParser"),
MovedModule("copyreg", "copy_reg"),
MovedModule("dbm_gnu", "gdbm", "dbm.gnu"),
MovedModule("http_cookiejar", "cookielib", "http.cookiejar"),
MovedModule("http_cookies", "Cookie", "http.cookies"),
MovedModule("html_entities", "htmlentitydefs", "html.entities"),
MovedModule("html_parser", "HTMLParser", "html.parser"),
MovedModule("http_client", "httplib", "http.client"),
MovedModule("email_mime_multipart", "email.MIMEMultipart", "email.mime.multipart"),
MovedModule("email_mime_text", "email.MIMEText", "email.mime.text"),
MovedModule("email_mime_base", "email.MIMEBase", "email.mime.base"),
MovedModule("BaseHTTPServer", "BaseHTTPServer", "http.server"),
MovedModule("CGIHTTPServer", "CGIHTTPServer", "http.server"),
MovedModule("SimpleHTTPServer", "SimpleHTTPServer", "http.server"),
MovedModule("cPickle", "cPickle", "pickle"),
MovedModule("queue", "Queue"),
MovedModule("reprlib", "repr"),
MovedModule("socketserver", "SocketServer"),
MovedModule("_thread", "thread", "_thread"),
MovedModule("tkinter", "Tkinter"),
MovedModule("tkinter_dialog", "Dialog", "tkinter.dialog"),
MovedModule("tkinter_filedialog", "FileDialog", "tkinter.filedialog"),
MovedModule("tkinter_scrolledtext", "ScrolledText", "tkinter.scrolledtext"),
MovedModule("tkinter_simpledialog", "SimpleDialog", "tkinter.simpledialog"),
MovedModule("tkinter_tix", "Tix", "tkinter.tix"),
MovedModule("tkinter_ttk", "ttk", "tkinter.ttk"),
MovedModule("tkinter_constants", "Tkconstants", "tkinter.constants"),
MovedModule("tkinter_dnd", "Tkdnd", "tkinter.dnd"),
MovedModule("tkinter_colorchooser", "tkColorChooser",
"tkinter.colorchooser"),
MovedModule("tkinter_commondialog", "tkCommonDialog",
"tkinter.commondialog"),
MovedModule("tkinter_tkfiledialog", "tkFileDialog", "tkinter.filedialog"),
MovedModule("tkinter_font", "tkFont", "tkinter.font"),
MovedModule("tkinter_messagebox", "tkMessageBox", "tkinter.messagebox"),
MovedModule("tkinter_tksimpledialog", "tkSimpleDialog",
"tkinter.simpledialog"),
MovedModule("urllib_parse", __name__+".moves.urllib_parse", "urllib.parse"),
MovedModule("urllib_error", __name__+".moves.urllib_error", "urllib.error"),
MovedModule("urllib", __name__+".moves.urllib", __name__+".moves.urllib"),
MovedModule("urllib_robotparser", "robotparser", "urllib.robotparser"),
MovedModule("xmlrpc_client", "xmlrpclib", "xmlrpc.client"),
MovedModule("xmlrpc_server", "xmlrpclib", "xmlrpc.server"),
MovedModule("winreg", "_winreg"),
]
forattrin_moved_attributes:
setattr(_MovedItems, attr.name, attr)
ifisinstance(attr, MovedModule):
sys.modules[__name__+".moves."+attr.name] =attr
delattr
_MovedItems._moved_attributes=_moved_attributes
moves=sys.modules[__name__+".moves"] =_MovedItems(__name__+".moves")
classModule_six_moves_urllib_parse(_LazyModule):
"""Lazy loading of moved objects in six.moves.urllib_parse"""
_urllib_parse_moved_attributes= [
MovedAttribute("ParseResult", "urlparse", "urllib.parse"),
MovedAttribute("SplitResult", "urlparse", "urllib.parse"),
MovedAttribute("parse_qs", "urlparse", "urllib.parse"),
MovedAttribute("parse_qsl", "urlparse", "urllib.parse"),
MovedAttribute("urldefrag", "urlparse", "urllib.parse"),
MovedAttribute("urljoin", "urlparse", "urllib.parse"),
MovedAttribute("urlparse", "urlparse", "urllib.parse"),
MovedAttribute("urlsplit", "urlparse", "urllib.parse"),
MovedAttribute("urlunparse", "urlparse", "urllib.parse"),
MovedAttribute("urlunsplit", "urlparse", "urllib.parse"),
MovedAttribute("quote", "urllib", "urllib.parse"),
MovedAttribute("quote_plus", "urllib", "urllib.parse"),
MovedAttribute("unquote", "urllib", "urllib.parse"),
MovedAttribute("unquote_plus", "urllib", "urllib.parse"),
MovedAttribute("urlencode", "urllib", "urllib.parse"),
MovedAttribute("splitquery", "urllib", "urllib.parse"),
]
forattrin_urllib_parse_moved_attributes:
setattr(Module_six_moves_urllib_parse, attr.name, attr)
delattr
Module_six_moves_urllib_parse._moved_attributes=_urllib_parse_moved_attributes
sys.modules[__name__+".moves.urllib_parse"] =sys.modules[__name__+".moves.urllib.parse"] =Module_six_moves_urllib_parse(__name__+".moves.urllib_parse")
classModule_six_moves_urllib_error(_LazyModule):
"""Lazy loading of moved objects in six.moves.urllib_error"""
_urllib_error_moved_attributes= [
MovedAttribute("URLError", "urllib2", "urllib.error"),
MovedAttribute("HTTPError", "urllib2", "urllib.error"),
MovedAttribute("ContentTooShortError", "urllib", "urllib.error"),
]
forattrin_urllib_error_moved_attributes:
setattr(Module_six_moves_urllib_error, attr.name, attr)
delattr
Module_six_moves_urllib_error._moved_attributes=_urllib_error_moved_attributes
sys.modules[__name__+".moves.urllib_error"] =sys.modules[__name__+".moves.urllib.error"] =Module_six_moves_urllib_error(__name__+".moves.urllib.error")
classModule_six_moves_urllib_request(_LazyModule):
"""Lazy loading of moved objects in six.moves.urllib_request"""
_urllib_request_moved_attributes= [
MovedAttribute("urlopen", "urllib2", "urllib.request"),
MovedAttribute("install_opener", "urllib2", "urllib.request"),
MovedAttribute("build_opener", "urllib2", "urllib.request"),
MovedAttribute("pathname2url", "urllib", "urllib.request"),
MovedAttribute("url2pathname", "urllib", "urllib.request"),
MovedAttribute("getproxies", "urllib", "urllib.request"),
MovedAttribute("Request", "urllib2", "urllib.request"),
MovedAttribute("OpenerDirector", "urllib2", "urllib.request"),
MovedAttribute("HTTPDefaultErrorHandler", "urllib2", "urllib.request"),
MovedAttribute("HTTPRedirectHandler", "urllib2", "urllib.request"),
MovedAttribute("HTTPCookieProcessor", "urllib2", "urllib.request"),
MovedAttribute("ProxyHandler", "urllib2", "urllib.request"),
MovedAttribute("BaseHandler", "urllib2", "urllib.request"),
MovedAttribute("HTTPPasswordMgr", "urllib2", "urllib.request"),
MovedAttribute("HTTPPasswordMgrWithDefaultRealm", "urllib2", "urllib.request"),
MovedAttribute("AbstractBasicAuthHandler", "urllib2", "urllib.request"),
MovedAttribute("HTTPBasicAuthHandler", "urllib2", "urllib.request"),
MovedAttribute("ProxyBasicAuthHandler", "urllib2", "urllib.request"),
MovedAttribute("AbstractDigestAuthHandler", "urllib2", "urllib.request"),
MovedAttribute("HTTPDigestAuthHandler", "urllib2", "urllib.request"),
MovedAttribute("ProxyDigestAuthHandler", "urllib2", "urllib.request"),
MovedAttribute("HTTPHandler", "urllib2", "urllib.request"),
MovedAttribute("HTTPSHandler", "urllib2", "urllib.request"),
MovedAttribute("FileHandler", "urllib2", "urllib.request"),
MovedAttribute("FTPHandler", "urllib2", "urllib.request"),
MovedAttribute("CacheFTPHandler", "urllib2", "urllib.request"),
MovedAttribute("UnknownHandler", "urllib2", "urllib.request"),
MovedAttribute("HTTPErrorProcessor", "urllib2", "urllib.request"),
MovedAttribute("urlretrieve", "urllib", "urllib.request"),
MovedAttribute("urlcleanup", "urllib", "urllib.request"),
MovedAttribute("URLopener", "urllib", "urllib.request"),
MovedAttribute("FancyURLopener", "urllib", "urllib.request"),
MovedAttribute("proxy_bypass", "urllib", "urllib.request"),
]
forattrin_urllib_request_moved_attributes:
setattr(Module_six_moves_urllib_request, attr.name, attr)
delattr
Module_six_moves_urllib_request._moved_attributes=_urllib_request_moved_attributes
sys.modules[__name__+".moves.urllib_request"] =sys.modules[__name__+".moves.urllib.request"] =Module_six_moves_urllib_request(__name__+".moves.urllib.request")
classModule_six_moves_urllib_response(_LazyModule):
"""Lazy loading of moved objects in six.moves.urllib_response"""
_urllib_response_moved_attributes= [
MovedAttribute("addbase", "urllib", "urllib.response"),
MovedAttribute("addclosehook", "urllib", "urllib.response"),
MovedAttribute("addinfo", "urllib", "urllib.response"),
MovedAttribute("addinfourl", "urllib", "urllib.response"),
]
forattrin_urllib_response_moved_attributes:
setattr(Module_six_moves_urllib_response, attr.name, attr)
delattr
Module_six_moves_urllib_response._moved_attributes=_urllib_response_moved_attributes
sys.modules[__name__+".moves.urllib_response"] =sys.modules[__name__+".moves.urllib.response"] =Module_six_moves_urllib_response(__name__+".moves.urllib.response")
classModule_six_moves_urllib_robotparser(_LazyModule):
"""Lazy loading of moved objects in six.moves.urllib_robotparser"""
_urllib_robotparser_moved_attributes= [
MovedAttribute("RobotFileParser", "robotparser", "urllib.robotparser"),
]
forattrin_urllib_robotparser_moved_attributes:
setattr(Module_six_moves_urllib_robotparser, attr.name, attr)
delattr
Module_six_moves_urllib_robotparser._moved_attributes=_urllib_robotparser_moved_attributes
sys.modules[__name__+".moves.urllib_robotparser"] =sys.modules[__name__+".moves.urllib.robotparser"] =Module_six_moves_urllib_robotparser(__name__+".moves.urllib.robotparser")
classModule_six_moves_urllib(types.ModuleType):
"""Create a six.moves.urllib namespace that resembles the Python 3 namespace"""
parse=sys.modules[__name__+".moves.urllib_parse"]
error=sys.modules[__name__+".moves.urllib_error"]
request=sys.modules[__name__+".moves.urllib_request"]
response=sys.modules[__name__+".moves.urllib_response"]
robotparser=sys.modules[__name__+".moves.urllib_robotparser"]
def__dir__(self):
return ['parse', 'error', 'request', 'response', 'robotparser']
sys.modules[__name__+".moves.urllib"] =Module_six_moves_urllib(__name__+".moves.urllib")
defadd_move(move):
"""Add an item to six.moves."""
setattr(_MovedItems, move.name, move)
defremove_move(name):
"""Remove item from six.moves."""
try:
delattr(_MovedItems, name)
exceptAttributeError:
try:
delmoves.__dict__[name]
exceptKeyError:
raiseAttributeError("no such move, %r"% (name,))
ifPY3:
_meth_func="__func__"
_meth_self="__self__"
_func_closure="__closure__"
_func_code="__code__"
_func_defaults="__defaults__"
_func_globals="__globals__"
_iterkeys="keys"
_itervalues="values"
_iteritems="items"
_iterlists="lists"
else:
_meth_func="im_func"
_meth_self="im_self"
_func_closure="func_closure"
_func_code="func_code"
_func_defaults="func_defaults"
_func_globals="func_globals"
_iterkeys="iterkeys"
_itervalues="itervalues"
_iteritems="iteritems"
_iterlists="iterlists"
try:
advance_iterator=next
exceptNameError:
defadvance_iterator(it):
returnit.next()
next=advance_iterator
try:
callable=callable
exceptNameError:
defcallable(obj):
returnany("__call__"inklass.__dict__forklassintype(obj).__mro__)
ifPY3:
defget_unbound_function(unbound):
returnunbound
create_bound_method=types.MethodType
Iterator=object
else:
defget_unbound_function(unbound):
returnunbound.im_func
defcreate_bound_method(func, obj):
returntypes.MethodType(func, obj, obj.__class__)
classIterator(object):
defnext(self):
returntype(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_closure=operator.attrgetter(_func_closure)
get_function_code=operator.attrgetter(_func_code)
get_function_defaults=operator.attrgetter(_func_defaults)
get_function_globals=operator.attrgetter(_func_globals)
defiterkeys(d, **kw):
"""Return an iterator over the keys of a dictionary."""
returniter(getattr(d, _iterkeys)(**kw))
defitervalues(d, **kw):
"""Return an iterator over the values of a dictionary."""
returniter(getattr(d, _itervalues)(**kw))
defiteritems(d, **kw):
"""Return an iterator over the (key, value) pairs of a dictionary."""
returniter(getattr(d, _iteritems)(**kw))
defiterlists(d, **kw):
"""Return an iterator over the (key, [values]) pairs of a dictionary."""
returniter(getattr(d, _iterlists)(**kw))
ifPY3:
defb(s):
returns.encode("latin-1")
defu(s):
returns
unichr=chr
ifsys.version_info[1] <=1:
defint2byte(i):
returnbytes((i,))
else:
# This is about 2x faster than the implementation above on 3.2+
int2byte=operator.methodcaller("to_bytes", 1, "big")
byte2int=operator.itemgetter(0)
indexbytes=operator.getitem
iterbytes=iter
importio
StringIO=io.StringIO
BytesIO=io.BytesIO
else:
defb(s):
returns
# Workaround for standalone backslash
defu(s):
returnunicode(s.replace(r'\\', r'\\\\'), "unicode_escape")
unichr=unichr
int2byte=chr
defbyte2int(bs):
returnord(bs[0])
defindexbytes(buf, i):
returnord(buf[i])
defiterbytes(buf):
return (ord(byte) forbyteinbuf)
importStringIO
StringIO=BytesIO=StringIO.StringIO
_add_doc(b, """Byte literal""")
_add_doc(u, """Text literal""")
ifPY3:
exec_=getattr(moves.builtins, "exec")
defreraise(tp, value, tb=None):
ifvalue.__traceback__isnottb:
raisevalue.with_traceback(tb)
raisevalue
else:
defexec_(_code_, _globs_=None, _locs_=None):
"""Execute code in a namespace."""
if_globs_isNone:
frame=sys._getframe(1)
_globs_=frame.f_globals
if_locs_isNone:
_locs_=frame.f_locals
delframe
elif_locs_isNone:
_locs_=_globs_
exec("""exec _code_ in _globs_, _locs_""")
exec_("""def reraise(tp, value, tb=None):
raise tp, value, tb
""")
print_=getattr(moves.builtins, "print", None)
ifprint_isNone:
defprint_(*args, **kwargs):
"""The new-style print function for Python 2.4 and 2.5."""
fp=kwargs.pop("file", sys.stdout)
iffpisNone:
return
defwrite(data):
ifnotisinstance(data, basestring):
data=str(data)
# If the file has an encoding, encode unicode with it.
if (isinstance(fp, file) and
isinstance(data, unicode) and
fp.encodingisnotNone):
errors=getattr(fp, "errors", None)
iferrorsisNone:
errors="strict"
data=data.encode(fp.encoding, errors)
fp.write(data)
want_unicode=False
sep=kwargs.pop("sep", None)
ifsepisnotNone:
ifisinstance(sep, unicode):
want_unicode=True
elifnotisinstance(sep, str):
raiseTypeError("sep must be None or a string")
end=kwargs.pop("end", None)
ifendisnotNone:
ifisinstance(end, unicode):
want_unicode=True
elifnotisinstance(end, str):
raiseTypeError("end must be None or a string")
ifkwargs:
raiseTypeError("invalid keyword arguments to print()")
ifnotwant_unicode:
forarginargs:
ifisinstance(arg, unicode):
want_unicode=True
break
ifwant_unicode:
newline=unicode("\n")
space=unicode(" ")
else:
newline="\n"
space=" "
ifsepisNone:
sep=space
ifendisNone:
end=newline
fori, arginenumerate(args):
ifi:
write(sep)
write(arg)
write(end)
_add_doc(reraise, """Reraise an exception.""")
defwith_metaclass(meta, *bases):
"""Create a base class with a metaclass."""
returnmeta("NewBase", bases, {})
defadd_metaclass(metaclass):
"""Class decorator for creating a class with a metaclass."""
defwrapper(cls):
orig_vars=cls.__dict__.copy()
orig_vars.pop('__dict__', None)
orig_vars.pop('__weakref__', None)
slots=orig_vars.get('__slots__')
ifslotsisnotNone:
ifisinstance(slots, str):
slots= [slots]
forslots_varinslots:
orig_vars.pop(slots_var)
returnmetaclass(cls.__name__, cls.__bases__, orig_vars)
returnwrapper