577 lines
20 KiB
Python
577 lines
20 KiB
Python
"""Utilities for writing code that runs on Python 2 and 3"""
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# Copyright (c) 2010-2013 Benjamin Peterson
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in all
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# copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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import operator
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import sys
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import types
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__author__ = "Benjamin Peterson <benjamin@python.org>"
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__version__ = "1.4.1"
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# Useful for very coarse version differentiation.
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PY2 = sys.version_info[0] == 2
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PY3 = sys.version_info[0] == 3
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if PY3:
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string_types = str,
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integer_types = int,
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class_types = type,
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text_type = str
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binary_type = bytes
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MAXSIZE = sys.maxsize
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else:
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string_types = basestring,
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integer_types = (int, long)
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class_types = (type, types.ClassType)
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text_type = unicode
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binary_type = str
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if sys.platform.startswith("java"):
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# Jython always uses 32 bits.
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MAXSIZE = int((1 << 31) - 1)
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else:
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# It's possible to have sizeof(long) != sizeof(Py_ssize_t).
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class X(object):
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def __len__(self):
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return 1 << 31
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try:
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len(X())
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except OverflowError:
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# 32-bit
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MAXSIZE = int((1 << 31) - 1)
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else:
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# 64-bit
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MAXSIZE = int((1 << 63) - 1)
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del X
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def _add_doc(func, doc):
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"""Add documentation to a function."""
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func.__doc__ = doc
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def _import_module(name):
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"""Import module, returning the module after the last dot."""
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__import__(name)
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return sys.modules[name]
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class _LazyDescr(object):
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def __init__(self, name):
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self.name = name
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def __get__(self, obj, tp):
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result = self._resolve()
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setattr(obj, self.name, result)
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# This is a bit ugly, but it avoids running this again.
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delattr(tp, self.name)
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return result
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class MovedModule(_LazyDescr):
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def __init__(self, name, old, new=None):
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super(MovedModule, self).__init__(name)
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if PY3:
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if new is None:
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new = name
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self.mod = new
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else:
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self.mod = old
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def _resolve(self):
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return _import_module(self.mod)
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class MovedAttribute(_LazyDescr):
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def __init__(self, name, old_mod, new_mod, old_attr=None, new_attr=None):
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super(MovedAttribute, self).__init__(name)
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if PY3:
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if new_mod is None:
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new_mod = name
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self.mod = new_mod
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if new_attr is None:
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if old_attr is None:
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new_attr = name
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else:
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new_attr = old_attr
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self.attr = new_attr
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else:
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self.mod = old_mod
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if old_attr is None:
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old_attr = name
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self.attr = old_attr
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def _resolve(self):
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module = _import_module(self.mod)
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return getattr(module, self.attr)
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class _MovedItems(types.ModuleType):
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"""Lazy loading of moved objects"""
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_moved_attributes = [
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MovedAttribute("cStringIO", "cStringIO", "io", "StringIO"),
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MovedAttribute("filter", "itertools", "builtins", "ifilter", "filter"),
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MovedAttribute("filterfalse", "itertools", "itertools", "ifilterfalse", "filterfalse"),
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MovedAttribute("input", "__builtin__", "builtins", "raw_input", "input"),
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MovedAttribute("map", "itertools", "builtins", "imap", "map"),
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MovedAttribute("range", "__builtin__", "builtins", "xrange", "range"),
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MovedAttribute("reload_module", "__builtin__", "imp", "reload"),
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MovedAttribute("reduce", "__builtin__", "functools"),
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MovedAttribute("StringIO", "StringIO", "io"),
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MovedAttribute("UserString", "UserString", "collections"),
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MovedAttribute("xrange", "__builtin__", "builtins", "xrange", "range"),
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MovedAttribute("zip", "itertools", "builtins", "izip", "zip"),
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MovedAttribute("zip_longest", "itertools", "itertools", "izip_longest", "zip_longest"),
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MovedModule("builtins", "__builtin__"),
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MovedModule("configparser", "ConfigParser"),
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MovedModule("copyreg", "copy_reg"),
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MovedModule("http_cookiejar", "cookielib", "http.cookiejar"),
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MovedModule("http_cookies", "Cookie", "http.cookies"),
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MovedModule("html_entities", "htmlentitydefs", "html.entities"),
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MovedModule("html_parser", "HTMLParser", "html.parser"),
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MovedModule("http_client", "httplib", "http.client"),
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MovedModule("email_mime_multipart", "email.MIMEMultipart", "email.mime.multipart"),
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MovedModule("email_mime_text", "email.MIMEText", "email.mime.text"),
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MovedModule("email_mime_base", "email.MIMEBase", "email.mime.base"),
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MovedModule("BaseHTTPServer", "BaseHTTPServer", "http.server"),
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MovedModule("CGIHTTPServer", "CGIHTTPServer", "http.server"),
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MovedModule("SimpleHTTPServer", "SimpleHTTPServer", "http.server"),
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MovedModule("cPickle", "cPickle", "pickle"),
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MovedModule("queue", "Queue"),
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MovedModule("reprlib", "repr"),
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MovedModule("socketserver", "SocketServer"),
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MovedModule("tkinter", "Tkinter"),
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MovedModule("tkinter_dialog", "Dialog", "tkinter.dialog"),
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MovedModule("tkinter_filedialog", "FileDialog", "tkinter.filedialog"),
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MovedModule("tkinter_scrolledtext", "ScrolledText", "tkinter.scrolledtext"),
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MovedModule("tkinter_simpledialog", "SimpleDialog", "tkinter.simpledialog"),
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MovedModule("tkinter_tix", "Tix", "tkinter.tix"),
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MovedModule("tkinter_constants", "Tkconstants", "tkinter.constants"),
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MovedModule("tkinter_dnd", "Tkdnd", "tkinter.dnd"),
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MovedModule("tkinter_colorchooser", "tkColorChooser",
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"tkinter.colorchooser"),
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MovedModule("tkinter_commondialog", "tkCommonDialog",
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"tkinter.commondialog"),
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MovedModule("tkinter_tkfiledialog", "tkFileDialog", "tkinter.filedialog"),
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MovedModule("tkinter_font", "tkFont", "tkinter.font"),
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MovedModule("tkinter_messagebox", "tkMessageBox", "tkinter.messagebox"),
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MovedModule("tkinter_tksimpledialog", "tkSimpleDialog",
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"tkinter.simpledialog"),
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MovedModule("urllib_parse", __name__ + ".moves.urllib_parse", "urllib.parse"),
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MovedModule("urllib_error", __name__ + ".moves.urllib_error", "urllib.error"),
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MovedModule("urllib", __name__ + ".moves.urllib", __name__ + ".moves.urllib"),
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MovedModule("urllib_robotparser", "robotparser", "urllib.robotparser"),
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MovedModule("winreg", "_winreg"),
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]
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for attr in _moved_attributes:
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setattr(_MovedItems, attr.name, attr)
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del attr
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moves = sys.modules[__name__ + ".moves"] = _MovedItems(__name__ + ".moves")
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class Module_six_moves_urllib_parse(types.ModuleType):
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"""Lazy loading of moved objects in six.moves.urllib_parse"""
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_urllib_parse_moved_attributes = [
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MovedAttribute("ParseResult", "urlparse", "urllib.parse"),
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MovedAttribute("parse_qs", "urlparse", "urllib.parse"),
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MovedAttribute("parse_qsl", "urlparse", "urllib.parse"),
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MovedAttribute("urldefrag", "urlparse", "urllib.parse"),
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MovedAttribute("urljoin", "urlparse", "urllib.parse"),
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MovedAttribute("urlparse", "urlparse", "urllib.parse"),
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MovedAttribute("urlsplit", "urlparse", "urllib.parse"),
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MovedAttribute("urlunparse", "urlparse", "urllib.parse"),
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MovedAttribute("urlunsplit", "urlparse", "urllib.parse"),
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MovedAttribute("quote", "urllib", "urllib.parse"),
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MovedAttribute("quote_plus", "urllib", "urllib.parse"),
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MovedAttribute("unquote", "urllib", "urllib.parse"),
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MovedAttribute("unquote_plus", "urllib", "urllib.parse"),
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MovedAttribute("urlencode", "urllib", "urllib.parse"),
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]
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for attr in _urllib_parse_moved_attributes:
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setattr(Module_six_moves_urllib_parse, attr.name, attr)
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del attr
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sys.modules[__name__ + ".moves.urllib_parse"] = Module_six_moves_urllib_parse(__name__ + ".moves.urllib_parse")
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sys.modules[__name__ + ".moves.urllib.parse"] = Module_six_moves_urllib_parse(__name__ + ".moves.urllib.parse")
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class Module_six_moves_urllib_error(types.ModuleType):
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"""Lazy loading of moved objects in six.moves.urllib_error"""
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_urllib_error_moved_attributes = [
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MovedAttribute("URLError", "urllib2", "urllib.error"),
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MovedAttribute("HTTPError", "urllib2", "urllib.error"),
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MovedAttribute("ContentTooShortError", "urllib", "urllib.error"),
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]
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for attr in _urllib_error_moved_attributes:
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setattr(Module_six_moves_urllib_error, attr.name, attr)
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del attr
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sys.modules[__name__ + ".moves.urllib_error"] = Module_six_moves_urllib_error(__name__ + ".moves.urllib_error")
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sys.modules[__name__ + ".moves.urllib.error"] = Module_six_moves_urllib_error(__name__ + ".moves.urllib.error")
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class Module_six_moves_urllib_request(types.ModuleType):
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"""Lazy loading of moved objects in six.moves.urllib_request"""
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_urllib_request_moved_attributes = [
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MovedAttribute("urlopen", "urllib2", "urllib.request"),
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MovedAttribute("install_opener", "urllib2", "urllib.request"),
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MovedAttribute("build_opener", "urllib2", "urllib.request"),
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MovedAttribute("pathname2url", "urllib", "urllib.request"),
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MovedAttribute("url2pathname", "urllib", "urllib.request"),
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MovedAttribute("getproxies", "urllib", "urllib.request"),
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MovedAttribute("Request", "urllib2", "urllib.request"),
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MovedAttribute("OpenerDirector", "urllib2", "urllib.request"),
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MovedAttribute("HTTPDefaultErrorHandler", "urllib2", "urllib.request"),
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MovedAttribute("HTTPRedirectHandler", "urllib2", "urllib.request"),
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MovedAttribute("HTTPCookieProcessor", "urllib2", "urllib.request"),
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MovedAttribute("ProxyHandler", "urllib2", "urllib.request"),
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MovedAttribute("BaseHandler", "urllib2", "urllib.request"),
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MovedAttribute("HTTPPasswordMgr", "urllib2", "urllib.request"),
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MovedAttribute("HTTPPasswordMgrWithDefaultRealm", "urllib2", "urllib.request"),
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MovedAttribute("AbstractBasicAuthHandler", "urllib2", "urllib.request"),
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MovedAttribute("HTTPBasicAuthHandler", "urllib2", "urllib.request"),
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MovedAttribute("ProxyBasicAuthHandler", "urllib2", "urllib.request"),
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MovedAttribute("AbstractDigestAuthHandler", "urllib2", "urllib.request"),
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MovedAttribute("HTTPDigestAuthHandler", "urllib2", "urllib.request"),
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MovedAttribute("ProxyDigestAuthHandler", "urllib2", "urllib.request"),
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MovedAttribute("HTTPHandler", "urllib2", "urllib.request"),
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MovedAttribute("HTTPSHandler", "urllib2", "urllib.request"),
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MovedAttribute("FileHandler", "urllib2", "urllib.request"),
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MovedAttribute("FTPHandler", "urllib2", "urllib.request"),
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MovedAttribute("CacheFTPHandler", "urllib2", "urllib.request"),
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MovedAttribute("UnknownHandler", "urllib2", "urllib.request"),
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MovedAttribute("HTTPErrorProcessor", "urllib2", "urllib.request"),
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MovedAttribute("urlretrieve", "urllib", "urllib.request"),
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MovedAttribute("urlcleanup", "urllib", "urllib.request"),
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MovedAttribute("URLopener", "urllib", "urllib.request"),
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MovedAttribute("FancyURLopener", "urllib", "urllib.request"),
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]
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for attr in _urllib_request_moved_attributes:
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setattr(Module_six_moves_urllib_request, attr.name, attr)
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del attr
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sys.modules[__name__ + ".moves.urllib_request"] = Module_six_moves_urllib_request(__name__ + ".moves.urllib_request")
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sys.modules[__name__ + ".moves.urllib.request"] = Module_six_moves_urllib_request(__name__ + ".moves.urllib.request")
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class Module_six_moves_urllib_response(types.ModuleType):
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"""Lazy loading of moved objects in six.moves.urllib_response"""
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_urllib_response_moved_attributes = [
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MovedAttribute("addbase", "urllib", "urllib.response"),
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MovedAttribute("addclosehook", "urllib", "urllib.response"),
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MovedAttribute("addinfo", "urllib", "urllib.response"),
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MovedAttribute("addinfourl", "urllib", "urllib.response"),
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]
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for attr in _urllib_response_moved_attributes:
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setattr(Module_six_moves_urllib_response, attr.name, attr)
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del attr
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sys.modules[__name__ + ".moves.urllib_response"] = Module_six_moves_urllib_response(__name__ + ".moves.urllib_response")
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sys.modules[__name__ + ".moves.urllib.response"] = Module_six_moves_urllib_response(__name__ + ".moves.urllib.response")
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class Module_six_moves_urllib_robotparser(types.ModuleType):
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"""Lazy loading of moved objects in six.moves.urllib_robotparser"""
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_urllib_robotparser_moved_attributes = [
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MovedAttribute("RobotFileParser", "robotparser", "urllib.robotparser"),
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]
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for attr in _urllib_robotparser_moved_attributes:
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setattr(Module_six_moves_urllib_robotparser, attr.name, attr)
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del attr
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sys.modules[__name__ + ".moves.urllib_robotparser"] = Module_six_moves_urllib_robotparser(__name__ + ".moves.urllib_robotparser")
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sys.modules[__name__ + ".moves.urllib.robotparser"] = Module_six_moves_urllib_robotparser(__name__ + ".moves.urllib.robotparser")
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class Module_six_moves_urllib(types.ModuleType):
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"""Create a six.moves.urllib namespace that resembles the Python 3 namespace"""
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parse = sys.modules[__name__ + ".moves.urllib_parse"]
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error = sys.modules[__name__ + ".moves.urllib_error"]
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request = sys.modules[__name__ + ".moves.urllib_request"]
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response = sys.modules[__name__ + ".moves.urllib_response"]
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robotparser = sys.modules[__name__ + ".moves.urllib_robotparser"]
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sys.modules[__name__ + ".moves.urllib"] = Module_six_moves_urllib(__name__ + ".moves.urllib")
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def add_move(move):
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"""Add an item to six.moves."""
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setattr(_MovedItems, move.name, move)
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def remove_move(name):
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"""Remove item from six.moves."""
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try:
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delattr(_MovedItems, name)
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except AttributeError:
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try:
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del moves.__dict__[name]
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except KeyError:
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raise AttributeError("no such move, %r" % (name,))
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if PY3:
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_meth_func = "__func__"
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_meth_self = "__self__"
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_func_closure = "__closure__"
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_func_code = "__code__"
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_func_defaults = "__defaults__"
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_func_globals = "__globals__"
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_iterkeys = "keys"
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_itervalues = "values"
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_iteritems = "items"
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_iterlists = "lists"
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else:
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_meth_func = "im_func"
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_meth_self = "im_self"
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_func_closure = "func_closure"
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_func_code = "func_code"
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_func_defaults = "func_defaults"
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_func_globals = "func_globals"
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_iterkeys = "iterkeys"
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_itervalues = "itervalues"
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_iteritems = "iteritems"
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_iterlists = "iterlists"
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try:
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advance_iterator = next
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except NameError:
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def advance_iterator(it):
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return it.next()
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next = advance_iterator
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try:
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callable = callable
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except NameError:
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def callable(obj):
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return any("__call__" in klass.__dict__ for klass in type(obj).__mro__)
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if PY3:
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def get_unbound_function(unbound):
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return unbound
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create_bound_method = types.MethodType
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Iterator = object
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else:
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def get_unbound_function(unbound):
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return unbound.im_func
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def create_bound_method(func, obj):
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return types.MethodType(func, obj, obj.__class__)
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class Iterator(object):
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def next(self):
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return type(self).__next__(self)
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callable = callable
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_add_doc(get_unbound_function,
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"""Get the function out of a possibly unbound function""")
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get_method_function = operator.attrgetter(_meth_func)
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get_method_self = operator.attrgetter(_meth_self)
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get_function_closure = operator.attrgetter(_func_closure)
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get_function_code = operator.attrgetter(_func_code)
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get_function_defaults = operator.attrgetter(_func_defaults)
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get_function_globals = operator.attrgetter(_func_globals)
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def iterkeys(d, **kw):
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"""Return an iterator over the keys of a dictionary."""
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return iter(getattr(d, _iterkeys)(**kw))
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def itervalues(d, **kw):
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"""Return an iterator over the values of a dictionary."""
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|
return iter(getattr(d, _itervalues)(**kw))
|
|
|
|
def iteritems(d, **kw):
|
|
"""Return an iterator over the (key, value) pairs of a dictionary."""
|
|
return iter(getattr(d, _iteritems)(**kw))
|
|
|
|
def iterlists(d, **kw):
|
|
"""Return an iterator over the (key, [values]) pairs of a dictionary."""
|
|
return iter(getattr(d, _iterlists)(**kw))
|
|
|
|
|
|
if PY3:
|
|
def b(s):
|
|
return s.encode("latin-1")
|
|
def u(s):
|
|
return s
|
|
unichr = chr
|
|
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")
|
|
byte2int = operator.itemgetter(0)
|
|
indexbytes = operator.getitem
|
|
iterbytes = iter
|
|
import io
|
|
StringIO = io.StringIO
|
|
BytesIO = io.BytesIO
|
|
else:
|
|
def b(s):
|
|
return s
|
|
def u(s):
|
|
return unicode(s, "unicode_escape")
|
|
unichr = unichr
|
|
int2byte = chr
|
|
def byte2int(bs):
|
|
return ord(bs[0])
|
|
def indexbytes(buf, i):
|
|
return ord(buf[i])
|
|
def iterbytes(buf):
|
|
return (ord(byte) for byte in buf)
|
|
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, *bases):
|
|
"""Create a base class with a metaclass."""
|
|
return meta("NewBase", bases, {})
|
|
|
|
def add_metaclass(metaclass):
|
|
"""Class decorator for creating a class with a metaclass."""
|
|
def wrapper(cls):
|
|
orig_vars = cls.__dict__.copy()
|
|
orig_vars.pop('__dict__', None)
|
|
orig_vars.pop('__weakref__', None)
|
|
for slots_var in orig_vars.get('__slots__', ()):
|
|
orig_vars.pop(slots_var)
|
|
return metaclass(cls.__name__, cls.__bases__, orig_vars)
|
|
return wrapper
|