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1# Copyright (c) 2010-2020 Benjamin Peterson
2#
3# Permission is hereby granted, free of charge, to any person obtaining a copy
4# of this software and associated documentation files (the "Software"), to deal
5# in the Software without restriction, including without limitation the rights
6# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
7# copies of the Software, and to permit persons to whom the Software is
8# furnished to do so, subject to the following conditions:
9#
10# The above copyright notice and this permission notice shall be included in all
11# copies or substantial portions of the Software.
12#
13# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
18# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
19# SOFTWARE.
21"""Utilities for writing code that runs on Python 2 and 3"""
23from __future__ import absolute_import
25import functools
26import itertools
27import operator
28import sys
29import types
31__author__ = "Benjamin Peterson <benjamin@python.org>"
32__version__ = "1.15.0"
35# Useful for very coarse version differentiation.
36PY2 = sys.version_info[0] == 2
37PY3 = sys.version_info[0] == 3
38PY34 = sys.version_info[0:2] >= (3, 4)
40if PY3:
41 string_types = str,
42 integer_types = int,
43 class_types = type,
44 text_type = str
45 binary_type = bytes
47 MAXSIZE = sys.maxsize
48else:
49 string_types = basestring,
50 integer_types = (int, long)
51 class_types = (type, types.ClassType)
52 text_type = unicode
53 binary_type = str
55 if sys.platform.startswith("java"):
56 # Jython always uses 32 bits.
57 MAXSIZE = int((1 << 31) - 1)
58 else:
59 # It's possible to have sizeof(long) != sizeof(Py_ssize_t).
60 class X(object):
62 def __len__(self):
63 return 1 << 31
64 try:
65 len(X())
66 except OverflowError:
67 # 32-bit
68 MAXSIZE = int((1 << 31) - 1)
69 else:
70 # 64-bit
71 MAXSIZE = int((1 << 63) - 1)
72 del X
75def _add_doc(func, doc):
76 """Add documentation to a function."""
77 func.__doc__ = doc
80def _import_module(name):
81 """Import module, returning the module after the last dot."""
82 __import__(name)
83 return sys.modules[name]
86class _LazyDescr(object):
88 def __init__(self, name):
89 self.name = name
91 def __get__(self, obj, tp):
92 result = self._resolve()
93 setattr(obj, self.name, result) # Invokes __set__.
94 try:
95 # This is a bit ugly, but it avoids running this again by
96 # removing this descriptor.
97 delattr(obj.__class__, self.name)
98 except AttributeError:
99 pass
100 return result
103class MovedModule(_LazyDescr):
105 def __init__(self, name, old, new=None):
106 super(MovedModule, self).__init__(name)
107 if PY3:
108 if new is None:
109 new = name
110 self.mod = new
111 else:
112 self.mod = old
114 def _resolve(self):
115 return _import_module(self.mod)
117 def __getattr__(self, attr):
118 _module = self._resolve()
119 value = getattr(_module, attr)
120 setattr(self, attr, value)
121 return value
124class _LazyModule(types.ModuleType):
126 def __init__(self, name):
127 super(_LazyModule, self).__init__(name)
128 self.__doc__ = self.__class__.__doc__
130 def __dir__(self):
131 attrs = ["__doc__", "__name__"]
132 attrs += [attr.name for attr in self._moved_attributes]
133 return attrs
135 # Subclasses should override this
136 _moved_attributes = []
139class MovedAttribute(_LazyDescr):
141 def __init__(self, name, old_mod, new_mod, old_attr=None, new_attr=None):
142 super(MovedAttribute, self).__init__(name)
143 if PY3:
144 if new_mod is None:
145 new_mod = name
146 self.mod = new_mod
147 if new_attr is None:
148 if old_attr is None:
149 new_attr = name
150 else:
151 new_attr = old_attr
152 self.attr = new_attr
153 else:
154 self.mod = old_mod
155 if old_attr is None:
156 old_attr = name
157 self.attr = old_attr
159 def _resolve(self):
160 module = _import_module(self.mod)
161 return getattr(module, self.attr)
164class _SixMetaPathImporter(object):
166 """
167 A meta path importer to import six.moves and its submodules.
169 This class implements a PEP302 finder and loader. It should be compatible
170 with Python 2.5 and all existing versions of Python3
171 """
173 def __init__(self, six_module_name):
174 self.name = six_module_name
175 self.known_modules = {}
177 def _add_module(self, mod, *fullnames):
178 for fullname in fullnames:
179 self.known_modules[self.name + "." + fullname] = mod
181 def _get_module(self, fullname):
182 return self.known_modules[self.name + "." + fullname]
184 def find_module(self, fullname, path=None):
185 if fullname in self.known_modules:
186 return self
187 return None
189 def __get_module(self, fullname):
190 try:
191 return self.known_modules[fullname]
192 except KeyError:
193 raise ImportError("This loader does not know module " + fullname)
195 def load_module(self, fullname):
196 try:
197 # in case of a reload
198 return sys.modules[fullname]
199 except KeyError:
200 pass
201 mod = self.__get_module(fullname)
202 if isinstance(mod, MovedModule):
203 mod = mod._resolve()
204 else:
205 mod.__loader__ = self
206 sys.modules[fullname] = mod
207 return mod
209 def is_package(self, fullname):
210 """
211 Return true, if the named module is a package.
213 We need this method to get correct spec objects with
214 Python 3.4 (see PEP451)
215 """
216 return hasattr(self.__get_module(fullname), "__path__")
218 def get_code(self, fullname):
219 """Return None
221 Required, if is_package is implemented"""
222 self.__get_module(fullname) # eventually raises ImportError
223 return None
224 get_source = get_code # same as get_code
226_importer = _SixMetaPathImporter(__name__)
229class _MovedItems(_LazyModule):
231 """Lazy loading of moved objects"""
232 __path__ = [] # mark as package
235_moved_attributes = [
236 MovedAttribute("cStringIO", "cStringIO", "io", "StringIO"),
237 MovedAttribute("filter", "itertools", "builtins", "ifilter", "filter"),
238 MovedAttribute("filterfalse", "itertools", "itertools", "ifilterfalse", "filterfalse"),
239 MovedAttribute("input", "__builtin__", "builtins", "raw_input", "input"),
240 MovedAttribute("intern", "__builtin__", "sys"),
241 MovedAttribute("map", "itertools", "builtins", "imap", "map"),
242 MovedAttribute("getcwd", "os", "os", "getcwdu", "getcwd"),
243 MovedAttribute("getcwdb", "os", "os", "getcwd", "getcwdb"),
244 MovedAttribute("getoutput", "commands", "subprocess"),
245 MovedAttribute("range", "__builtin__", "builtins", "xrange", "range"),
246 MovedAttribute("reload_module", "__builtin__", "importlib" if PY34 else "imp", "reload"),
247 MovedAttribute("reduce", "__builtin__", "functools"),
248 MovedAttribute("shlex_quote", "pipes", "shlex", "quote"),
249 MovedAttribute("StringIO", "StringIO", "io"),
250 MovedAttribute("UserDict", "UserDict", "collections"),
251 MovedAttribute("UserList", "UserList", "collections"),
252 MovedAttribute("UserString", "UserString", "collections"),
253 MovedAttribute("xrange", "__builtin__", "builtins", "xrange", "range"),
254 MovedAttribute("zip", "itertools", "builtins", "izip", "zip"),
255 MovedAttribute("zip_longest", "itertools", "itertools", "izip_longest", "zip_longest"),
256 MovedModule("builtins", "__builtin__"),
257 MovedModule("configparser", "ConfigParser"),
258 MovedModule("collections_abc", "collections", "collections.abc" if sys.version_info >= (3, 3) else "collections"),
259 MovedModule("copyreg", "copy_reg"),
260 MovedModule("dbm_gnu", "gdbm", "dbm.gnu"),
261 MovedModule("dbm_ndbm", "dbm", "dbm.ndbm"),
262 MovedModule("_dummy_thread", "dummy_thread", "_dummy_thread" if sys.version_info < (3, 9) else "_thread"),
263 MovedModule("http_cookiejar", "cookielib", "http.cookiejar"),
264 MovedModule("http_cookies", "Cookie", "http.cookies"),
265 MovedModule("html_entities", "htmlentitydefs", "html.entities"),
266 MovedModule("html_parser", "HTMLParser", "html.parser"),
267 MovedModule("http_client", "httplib", "http.client"),
268 MovedModule("email_mime_base", "email.MIMEBase", "email.mime.base"),
269 MovedModule("email_mime_image", "email.MIMEImage", "email.mime.image"),
270 MovedModule("email_mime_multipart", "email.MIMEMultipart", "email.mime.multipart"),
271 MovedModule("email_mime_nonmultipart", "email.MIMENonMultipart", "email.mime.nonmultipart"),
272 MovedModule("email_mime_text", "email.MIMEText", "email.mime.text"),
273 MovedModule("BaseHTTPServer", "BaseHTTPServer", "http.server"),
274 MovedModule("CGIHTTPServer", "CGIHTTPServer", "http.server"),
275 MovedModule("SimpleHTTPServer", "SimpleHTTPServer", "http.server"),
276 MovedModule("cPickle", "cPickle", "pickle"),
277 MovedModule("queue", "Queue"),
278 MovedModule("reprlib", "repr"),
279 MovedModule("socketserver", "SocketServer"),
280 MovedModule("_thread", "thread", "_thread"),
281 MovedModule("tkinter", "Tkinter"),
282 MovedModule("tkinter_dialog", "Dialog", "tkinter.dialog"),
283 MovedModule("tkinter_filedialog", "FileDialog", "tkinter.filedialog"),
284 MovedModule("tkinter_scrolledtext", "ScrolledText", "tkinter.scrolledtext"),
285 MovedModule("tkinter_simpledialog", "SimpleDialog", "tkinter.simpledialog"),
286 MovedModule("tkinter_tix", "Tix", "tkinter.tix"),
287 MovedModule("tkinter_ttk", "ttk", "tkinter.ttk"),
288 MovedModule("tkinter_constants", "Tkconstants", "tkinter.constants"),
289 MovedModule("tkinter_dnd", "Tkdnd", "tkinter.dnd"),
290 MovedModule("tkinter_colorchooser", "tkColorChooser",
291 "tkinter.colorchooser"),
292 MovedModule("tkinter_commondialog", "tkCommonDialog",
293 "tkinter.commondialog"),
294 MovedModule("tkinter_tkfiledialog", "tkFileDialog", "tkinter.filedialog"),
295 MovedModule("tkinter_font", "tkFont", "tkinter.font"),
296 MovedModule("tkinter_messagebox", "tkMessageBox", "tkinter.messagebox"),
297 MovedModule("tkinter_tksimpledialog", "tkSimpleDialog",
298 "tkinter.simpledialog"),
299 MovedModule("urllib_parse", __name__ + ".moves.urllib_parse", "urllib.parse"),
300 MovedModule("urllib_error", __name__ + ".moves.urllib_error", "urllib.error"),
301 MovedModule("urllib", __name__ + ".moves.urllib", __name__ + ".moves.urllib"),
302 MovedModule("urllib_robotparser", "robotparser", "urllib.robotparser"),
303 MovedModule("xmlrpc_client", "xmlrpclib", "xmlrpc.client"),
304 MovedModule("xmlrpc_server", "SimpleXMLRPCServer", "xmlrpc.server"),
305]
306# Add windows specific modules.
307if sys.platform == "win32":
308 _moved_attributes += [
309 MovedModule("winreg", "_winreg"),
310 ]
312for attr in _moved_attributes:
313 setattr(_MovedItems, attr.name, attr)
314 if isinstance(attr, MovedModule):
315 _importer._add_module(attr, "moves." + attr.name)
316del attr
318_MovedItems._moved_attributes = _moved_attributes
320moves = _MovedItems(__name__ + ".moves")
321_importer._add_module(moves, "moves")
324class Module_six_moves_urllib_parse(_LazyModule):
326 """Lazy loading of moved objects in six.moves.urllib_parse"""
329_urllib_parse_moved_attributes = [
330 MovedAttribute("ParseResult", "urlparse", "urllib.parse"),
331 MovedAttribute("SplitResult", "urlparse", "urllib.parse"),
332 MovedAttribute("parse_qs", "urlparse", "urllib.parse"),
333 MovedAttribute("parse_qsl", "urlparse", "urllib.parse"),
334 MovedAttribute("urldefrag", "urlparse", "urllib.parse"),
335 MovedAttribute("urljoin", "urlparse", "urllib.parse"),
336 MovedAttribute("urlparse", "urlparse", "urllib.parse"),
337 MovedAttribute("urlsplit", "urlparse", "urllib.parse"),
338 MovedAttribute("urlunparse", "urlparse", "urllib.parse"),
339 MovedAttribute("urlunsplit", "urlparse", "urllib.parse"),
340 MovedAttribute("quote", "urllib", "urllib.parse"),
341 MovedAttribute("quote_plus", "urllib", "urllib.parse"),
342 MovedAttribute("unquote", "urllib", "urllib.parse"),
343 MovedAttribute("unquote_plus", "urllib", "urllib.parse"),
344 MovedAttribute("unquote_to_bytes", "urllib", "urllib.parse", "unquote", "unquote_to_bytes"),
345 MovedAttribute("urlencode", "urllib", "urllib.parse"),
346 MovedAttribute("splitquery", "urllib", "urllib.parse"),
347 MovedAttribute("splittag", "urllib", "urllib.parse"),
348 MovedAttribute("splituser", "urllib", "urllib.parse"),
349 MovedAttribute("splitvalue", "urllib", "urllib.parse"),
350 MovedAttribute("uses_fragment", "urlparse", "urllib.parse"),
351 MovedAttribute("uses_netloc", "urlparse", "urllib.parse"),
352 MovedAttribute("uses_params", "urlparse", "urllib.parse"),
353 MovedAttribute("uses_query", "urlparse", "urllib.parse"),
354 MovedAttribute("uses_relative", "urlparse", "urllib.parse"),
355]
356for attr in _urllib_parse_moved_attributes:
357 setattr(Module_six_moves_urllib_parse, attr.name, attr)
358del attr
360Module_six_moves_urllib_parse._moved_attributes = _urllib_parse_moved_attributes
362_importer._add_module(Module_six_moves_urllib_parse(__name__ + ".moves.urllib_parse"),
363 "moves.urllib_parse", "moves.urllib.parse")
366class Module_six_moves_urllib_error(_LazyModule):
368 """Lazy loading of moved objects in six.moves.urllib_error"""
371_urllib_error_moved_attributes = [
372 MovedAttribute("URLError", "urllib2", "urllib.error"),
373 MovedAttribute("HTTPError", "urllib2", "urllib.error"),
374 MovedAttribute("ContentTooShortError", "urllib", "urllib.error"),
375]
376for attr in _urllib_error_moved_attributes:
377 setattr(Module_six_moves_urllib_error, attr.name, attr)
378del attr
380Module_six_moves_urllib_error._moved_attributes = _urllib_error_moved_attributes
382_importer._add_module(Module_six_moves_urllib_error(__name__ + ".moves.urllib.error"),
383 "moves.urllib_error", "moves.urllib.error")
386class Module_six_moves_urllib_request(_LazyModule):
388 """Lazy loading of moved objects in six.moves.urllib_request"""
391_urllib_request_moved_attributes = [
392 MovedAttribute("urlopen", "urllib2", "urllib.request"),
393 MovedAttribute("install_opener", "urllib2", "urllib.request"),
394 MovedAttribute("build_opener", "urllib2", "urllib.request"),
395 MovedAttribute("pathname2url", "urllib", "urllib.request"),
396 MovedAttribute("url2pathname", "urllib", "urllib.request"),
397 MovedAttribute("getproxies", "urllib", "urllib.request"),
398 MovedAttribute("Request", "urllib2", "urllib.request"),
399 MovedAttribute("OpenerDirector", "urllib2", "urllib.request"),
400 MovedAttribute("HTTPDefaultErrorHandler", "urllib2", "urllib.request"),
401 MovedAttribute("HTTPRedirectHandler", "urllib2", "urllib.request"),
402 MovedAttribute("HTTPCookieProcessor", "urllib2", "urllib.request"),
403 MovedAttribute("ProxyHandler", "urllib2", "urllib.request"),
404 MovedAttribute("BaseHandler", "urllib2", "urllib.request"),
405 MovedAttribute("HTTPPasswordMgr", "urllib2", "urllib.request"),
406 MovedAttribute("HTTPPasswordMgrWithDefaultRealm", "urllib2", "urllib.request"),
407 MovedAttribute("AbstractBasicAuthHandler", "urllib2", "urllib.request"),
408 MovedAttribute("HTTPBasicAuthHandler", "urllib2", "urllib.request"),
409 MovedAttribute("ProxyBasicAuthHandler", "urllib2", "urllib.request"),
410 MovedAttribute("AbstractDigestAuthHandler", "urllib2", "urllib.request"),
411 MovedAttribute("HTTPDigestAuthHandler", "urllib2", "urllib.request"),
412 MovedAttribute("ProxyDigestAuthHandler", "urllib2", "urllib.request"),
413 MovedAttribute("HTTPHandler", "urllib2", "urllib.request"),
414 MovedAttribute("HTTPSHandler", "urllib2", "urllib.request"),
415 MovedAttribute("FileHandler", "urllib2", "urllib.request"),
416 MovedAttribute("FTPHandler", "urllib2", "urllib.request"),
417 MovedAttribute("CacheFTPHandler", "urllib2", "urllib.request"),
418 MovedAttribute("UnknownHandler", "urllib2", "urllib.request"),
419 MovedAttribute("HTTPErrorProcessor", "urllib2", "urllib.request"),
420 MovedAttribute("urlretrieve", "urllib", "urllib.request"),
421 MovedAttribute("urlcleanup", "urllib", "urllib.request"),
422 MovedAttribute("URLopener", "urllib", "urllib.request"),
423 MovedAttribute("FancyURLopener", "urllib", "urllib.request"),
424 MovedAttribute("proxy_bypass", "urllib", "urllib.request"),
425 MovedAttribute("parse_http_list", "urllib2", "urllib.request"),
426 MovedAttribute("parse_keqv_list", "urllib2", "urllib.request"),
427]
428for attr in _urllib_request_moved_attributes:
429 setattr(Module_six_moves_urllib_request, attr.name, attr)
430del attr
432Module_six_moves_urllib_request._moved_attributes = _urllib_request_moved_attributes
434_importer._add_module(Module_six_moves_urllib_request(__name__ + ".moves.urllib.request"),
435 "moves.urllib_request", "moves.urllib.request")
438class Module_six_moves_urllib_response(_LazyModule):
440 """Lazy loading of moved objects in six.moves.urllib_response"""
443_urllib_response_moved_attributes = [
444 MovedAttribute("addbase", "urllib", "urllib.response"),
445 MovedAttribute("addclosehook", "urllib", "urllib.response"),
446 MovedAttribute("addinfo", "urllib", "urllib.response"),
447 MovedAttribute("addinfourl", "urllib", "urllib.response"),
448]
449for attr in _urllib_response_moved_attributes:
450 setattr(Module_six_moves_urllib_response, attr.name, attr)
451del attr
453Module_six_moves_urllib_response._moved_attributes = _urllib_response_moved_attributes
455_importer._add_module(Module_six_moves_urllib_response(__name__ + ".moves.urllib.response"),
456 "moves.urllib_response", "moves.urllib.response")
459class Module_six_moves_urllib_robotparser(_LazyModule):
461 """Lazy loading of moved objects in six.moves.urllib_robotparser"""
464_urllib_robotparser_moved_attributes = [
465 MovedAttribute("RobotFileParser", "robotparser", "urllib.robotparser"),
466]
467for attr in _urllib_robotparser_moved_attributes:
468 setattr(Module_six_moves_urllib_robotparser, attr.name, attr)
469del attr
471Module_six_moves_urllib_robotparser._moved_attributes = _urllib_robotparser_moved_attributes
473_importer._add_module(Module_six_moves_urllib_robotparser(__name__ + ".moves.urllib.robotparser"),
474 "moves.urllib_robotparser", "moves.urllib.robotparser")
477class Module_six_moves_urllib(types.ModuleType):
479 """Create a six.moves.urllib namespace that resembles the Python 3 namespace"""
480 __path__ = [] # mark as package
481 parse = _importer._get_module("moves.urllib_parse")
482 error = _importer._get_module("moves.urllib_error")
483 request = _importer._get_module("moves.urllib_request")
484 response = _importer._get_module("moves.urllib_response")
485 robotparser = _importer._get_module("moves.urllib_robotparser")
487 def __dir__(self):
488 return ['parse', 'error', 'request', 'response', 'robotparser']
490_importer._add_module(Module_six_moves_urllib(__name__ + ".moves.urllib"),
491 "moves.urllib")
494def add_move(move):
495 """Add an item to six.moves."""
496 setattr(_MovedItems, move.name, move)
499def remove_move(name):
500 """Remove item from six.moves."""
501 try:
502 delattr(_MovedItems, name)
503 except AttributeError:
504 try:
505 del moves.__dict__[name]
506 except KeyError:
507 raise AttributeError("no such move, %r" % (name,))
510if PY3:
511 _meth_func = "__func__"
512 _meth_self = "__self__"
514 _func_closure = "__closure__"
515 _func_code = "__code__"
516 _func_defaults = "__defaults__"
517 _func_globals = "__globals__"
518else:
519 _meth_func = "im_func"
520 _meth_self = "im_self"
522 _func_closure = "func_closure"
523 _func_code = "func_code"
524 _func_defaults = "func_defaults"
525 _func_globals = "func_globals"
528try:
529 advance_iterator = next
530except NameError:
531 def advance_iterator(it):
532 return it.next()
533next = advance_iterator
536try:
537 callable = callable
538except NameError:
539 def callable(obj):
540 return any("__call__" in klass.__dict__ for klass in type(obj).__mro__)
543if PY3:
544 def get_unbound_function(unbound):
545 return unbound
547 create_bound_method = types.MethodType
549 def create_unbound_method(func, cls):
550 return func
552 Iterator = object
553else:
554 def get_unbound_function(unbound):
555 return unbound.im_func
557 def create_bound_method(func, obj):
558 return types.MethodType(func, obj, obj.__class__)
560 def create_unbound_method(func, cls):
561 return types.MethodType(func, None, cls)
563 class Iterator(object):
565 def next(self):
566 return type(self).__next__(self)
568 callable = callable
569_add_doc(get_unbound_function,
570 """Get the function out of a possibly unbound function""")
573get_method_function = operator.attrgetter(_meth_func)
574get_method_self = operator.attrgetter(_meth_self)
575get_function_closure = operator.attrgetter(_func_closure)
576get_function_code = operator.attrgetter(_func_code)
577get_function_defaults = operator.attrgetter(_func_defaults)
578get_function_globals = operator.attrgetter(_func_globals)
581if PY3:
582 def iterkeys(d, **kw):
583 return iter(d.keys(**kw))
585 def itervalues(d, **kw):
586 return iter(d.values(**kw))
588 def iteritems(d, **kw):
589 return iter(d.items(**kw))
591 def iterlists(d, **kw):
592 return iter(d.lists(**kw))
594 viewkeys = operator.methodcaller("keys")
596 viewvalues = operator.methodcaller("values")
598 viewitems = operator.methodcaller("items")
599else:
600 def iterkeys(d, **kw):
601 return d.iterkeys(**kw)
603 def itervalues(d, **kw):
604 return d.itervalues(**kw)
606 def iteritems(d, **kw):
607 return d.iteritems(**kw)
609 def iterlists(d, **kw):
610 return d.iterlists(**kw)
612 viewkeys = operator.methodcaller("viewkeys")
614 viewvalues = operator.methodcaller("viewvalues")
616 viewitems = operator.methodcaller("viewitems")
618_add_doc(iterkeys, "Return an iterator over the keys of a dictionary.")
619_add_doc(itervalues, "Return an iterator over the values of a dictionary.")
620_add_doc(iteritems,
621 "Return an iterator over the (key, value) pairs of a dictionary.")
622_add_doc(iterlists,
623 "Return an iterator over the (key, [values]) pairs of a dictionary.")
626if PY3:
627 def b(s):
628 return s.encode("latin-1")
630 def u(s):
631 return s
632 unichr = chr
633 import struct
634 int2byte = struct.Struct(">B").pack
635 del struct
636 byte2int = operator.itemgetter(0)
637 indexbytes = operator.getitem
638 iterbytes = iter
639 import io
640 StringIO = io.StringIO
641 BytesIO = io.BytesIO
642 del io
643 _assertCountEqual = "assertCountEqual"
644 if sys.version_info[1] <= 1:
645 _assertRaisesRegex = "assertRaisesRegexp"
646 _assertRegex = "assertRegexpMatches"
647 _assertNotRegex = "assertNotRegexpMatches"
648 else:
649 _assertRaisesRegex = "assertRaisesRegex"
650 _assertRegex = "assertRegex"
651 _assertNotRegex = "assertNotRegex"
652else:
653 def b(s):
654 return s
655 # Workaround for standalone backslash
657 def u(s):
658 return unicode(s.replace(r'\\', r'\\\\'), "unicode_escape")
659 unichr = unichr
660 int2byte = chr
662 def byte2int(bs):
663 return ord(bs[0])
665 def indexbytes(buf, i):
666 return ord(buf[i])
667 iterbytes = functools.partial(itertools.imap, ord)
668 import StringIO
669 StringIO = BytesIO = StringIO.StringIO
670 _assertCountEqual = "assertItemsEqual"
671 _assertRaisesRegex = "assertRaisesRegexp"
672 _assertRegex = "assertRegexpMatches"
673 _assertNotRegex = "assertNotRegexpMatches"
674_add_doc(b, """Byte literal""")
675_add_doc(u, """Text literal""")
678def assertCountEqual(self, *args, **kwargs):
679 return getattr(self, _assertCountEqual)(*args, **kwargs)
682def assertRaisesRegex(self, *args, **kwargs):
683 return getattr(self, _assertRaisesRegex)(*args, **kwargs)
686def assertRegex(self, *args, **kwargs):
687 return getattr(self, _assertRegex)(*args, **kwargs)
690def assertNotRegex(self, *args, **kwargs):
691 return getattr(self, _assertNotRegex)(*args, **kwargs)
694if PY3:
695 exec_ = getattr(moves.builtins, "exec")
697 def reraise(tp, value, tb=None):
698 try:
699 if value is None:
700 value = tp()
701 if value.__traceback__ is not tb:
702 raise value.with_traceback(tb)
703 raise value
704 finally:
705 value = None
706 tb = None
708else:
709 def exec_(_code_, _globs_=None, _locs_=None):
710 """Execute code in a namespace."""
711 if _globs_ is None:
712 frame = sys._getframe(1)
713 _globs_ = frame.f_globals
714 if _locs_ is None:
715 _locs_ = frame.f_locals
716 del frame
717 elif _locs_ is None:
718 _locs_ = _globs_
719 exec("""exec _code_ in _globs_, _locs_""")
721 exec_("""def reraise(tp, value, tb=None):
722 try:
723 raise tp, value, tb
724 finally:
725 tb = None
726""")
729if sys.version_info[:2] > (3,):
730 exec_("""def raise_from(value, from_value):
731 try:
732 raise value from from_value
733 finally:
734 value = None
735""")
736else:
737 def raise_from(value, from_value):
738 raise value
741print_ = getattr(moves.builtins, "print", None)
742if print_ is None:
743 def print_(*args, **kwargs):
744 """The new-style print function for Python 2.4 and 2.5."""
745 fp = kwargs.pop("file", sys.stdout)
746 if fp is None:
747 return
749 def write(data):
750 if not isinstance(data, basestring):
751 data = str(data)
752 # If the file has an encoding, encode unicode with it.
753 if (isinstance(fp, file) and
754 isinstance(data, unicode) and
755 fp.encoding is not None):
756 errors = getattr(fp, "errors", None)
757 if errors is None:
758 errors = "strict"
759 data = data.encode(fp.encoding, errors)
760 fp.write(data)
761 want_unicode = False
762 sep = kwargs.pop("sep", None)
763 if sep is not None:
764 if isinstance(sep, unicode):
765 want_unicode = True
766 elif not isinstance(sep, str):
767 raise TypeError("sep must be None or a string")
768 end = kwargs.pop("end", None)
769 if end is not None:
770 if isinstance(end, unicode):
771 want_unicode = True
772 elif not isinstance(end, str):
773 raise TypeError("end must be None or a string")
774 if kwargs:
775 raise TypeError("invalid keyword arguments to print()")
776 if not want_unicode:
777 for arg in args:
778 if isinstance(arg, unicode):
779 want_unicode = True
780 break
781 if want_unicode:
782 newline = unicode("\n")
783 space = unicode(" ")
784 else:
785 newline = "\n"
786 space = " "
787 if sep is None:
788 sep = space
789 if end is None:
790 end = newline
791 for i, arg in enumerate(args):
792 if i:
793 write(sep)
794 write(arg)
795 write(end)
796if sys.version_info[:2] < (3, 3):
797 _print = print_
799 def print_(*args, **kwargs):
800 fp = kwargs.get("file", sys.stdout)
801 flush = kwargs.pop("flush", False)
802 _print(*args, **kwargs)
803 if flush and fp is not None:
804 fp.flush()
806_add_doc(reraise, """Reraise an exception.""")
808if sys.version_info[0:2] < (3, 4):
809 # This does exactly the same what the :func:`py3:functools.update_wrapper`
810 # function does on Python versions after 3.2. It sets the ``__wrapped__``
811 # attribute on ``wrapper`` object and it doesn't raise an error if any of
812 # the attributes mentioned in ``assigned`` and ``updated`` are missing on
813 # ``wrapped`` object.
814 def _update_wrapper(wrapper, wrapped,
815 assigned=functools.WRAPPER_ASSIGNMENTS,
816 updated=functools.WRAPPER_UPDATES):
817 for attr in assigned:
818 try:
819 value = getattr(wrapped, attr)
820 except AttributeError:
821 continue
822 else:
823 setattr(wrapper, attr, value)
824 for attr in updated:
825 getattr(wrapper, attr).update(getattr(wrapped, attr, {}))
826 wrapper.__wrapped__ = wrapped
827 return wrapper
828 _update_wrapper.__doc__ = functools.update_wrapper.__doc__
830 def wraps(wrapped, assigned=functools.WRAPPER_ASSIGNMENTS,
831 updated=functools.WRAPPER_UPDATES):
832 return functools.partial(_update_wrapper, wrapped=wrapped,
833 assigned=assigned, updated=updated)
834 wraps.__doc__ = functools.wraps.__doc__
836else:
837 wraps = functools.wraps
840def with_metaclass(meta, *bases):
841 """Create a base class with a metaclass."""
842 # This requires a bit of explanation: the basic idea is to make a dummy
843 # metaclass for one level of class instantiation that replaces itself with
844 # the actual metaclass.
845 class metaclass(type):
847 def __new__(cls, name, this_bases, d):
848 if sys.version_info[:2] >= (3, 7):
849 # This version introduced PEP 560 that requires a bit
850 # of extra care (we mimic what is done by __build_class__).
851 resolved_bases = types.resolve_bases(bases)
852 if resolved_bases is not bases:
853 d['__orig_bases__'] = bases
854 else:
855 resolved_bases = bases
856 return meta(name, resolved_bases, d)
858 @classmethod
859 def __prepare__(cls, name, this_bases):
860 return meta.__prepare__(name, bases)
861 return type.__new__(metaclass, 'temporary_class', (), {})
864def add_metaclass(metaclass):
865 """Class decorator for creating a class with a metaclass."""
866 def wrapper(cls):
867 orig_vars = cls.__dict__.copy()
868 slots = orig_vars.get('__slots__')
869 if slots is not None:
870 if isinstance(slots, str):
871 slots = [slots]
872 for slots_var in slots:
873 orig_vars.pop(slots_var)
874 orig_vars.pop('__dict__', None)
875 orig_vars.pop('__weakref__', None)
876 if hasattr(cls, '__qualname__'):
877 orig_vars['__qualname__'] = cls.__qualname__
878 return metaclass(cls.__name__, cls.__bases__, orig_vars)
879 return wrapper
882def ensure_binary(s, encoding='utf-8', errors='strict'):
883 """Coerce **s** to six.binary_type.
885 For Python 2:
886 - `unicode` -> encoded to `str`
887 - `str` -> `str`
889 For Python 3:
890 - `str` -> encoded to `bytes`
891 - `bytes` -> `bytes`
892 """
893 if isinstance(s, binary_type):
894 return s
895 if isinstance(s, text_type):
896 return s.encode(encoding, errors)
897 raise TypeError("not expecting type '%s'" % type(s))
900def ensure_str(s, encoding='utf-8', errors='strict'):
901 """Coerce *s* to `str`.
903 For Python 2:
904 - `unicode` -> encoded to `str`
905 - `str` -> `str`
907 For Python 3:
908 - `str` -> `str`
909 - `bytes` -> decoded to `str`
910 """
911 # Optimization: Fast return for the common case.
912 if type(s) is str:
913 return s
914 if PY2 and isinstance(s, text_type):
915 return s.encode(encoding, errors)
916 elif PY3 and isinstance(s, binary_type):
917 return s.decode(encoding, errors)
918 elif not isinstance(s, (text_type, binary_type)):
919 raise TypeError("not expecting type '%s'" % type(s))
920 return s
923def ensure_text(s, encoding='utf-8', errors='strict'):
924 """Coerce *s* to six.text_type.
926 For Python 2:
927 - `unicode` -> `unicode`
928 - `str` -> `unicode`
930 For Python 3:
931 - `str` -> `str`
932 - `bytes` -> decoded to `str`
933 """
934 if isinstance(s, binary_type):
935 return s.decode(encoding, errors)
936 elif isinstance(s, text_type):
937 return s
938 else:
939 raise TypeError("not expecting type '%s'" % type(s))
942def python_2_unicode_compatible(klass):
943 """
944 A class decorator that defines __unicode__ and __str__ methods under Python 2.
945 Under Python 3 it does nothing.
947 To support Python 2 and 3 with a single code base, define a __str__ method
948 returning text and apply this decorator to the class.
949 """
950 if PY2:
951 if '__str__' not in klass.__dict__:
952 raise ValueError("@python_2_unicode_compatible cannot be applied "
953 "to %s because it doesn't define __str__()." %
954 klass.__name__)
955 klass.__unicode__ = klass.__str__
956 klass.__str__ = lambda self: self.__unicode__().encode('utf-8')
957 return klass
960# Complete the moves implementation.
961# This code is at the end of this module to speed up module loading.
962# Turn this module into a package.
963__path__ = [] # required for PEP 302 and PEP 451
964__package__ = __name__ # see PEP 366 @ReservedAssignment
965if globals().get("__spec__") is not None:
966 __spec__.submodule_search_locations = [] # PEP 451 @UndefinedVariable
967# Remove other six meta path importers, since they cause problems. This can
968# happen if six is removed from sys.modules and then reloaded. (Setuptools does
969# this for some reason.)
970if sys.meta_path:
971 for i, importer in enumerate(sys.meta_path):
972 # Here's some real nastiness: Another "instance" of the six module might
973 # be floating around. Therefore, we can't use isinstance() to check for
974 # the six meta path importer, since the other six instance will have
975 # inserted an importer with different class.
976 if (type(importer).__name__ == "_SixMetaPathImporter" and
977 importer.name == __name__):
978 del sys.meta_path[i]
979 break
980 del i, importer
981# Finally, add the importer to the meta path import hook.
982sys.meta_path.append(_importer)