ó âdc@@sdZddlmZddlZddlmZddlmZmZe Z e ƒZ e e dd„Z d„Zd gZdS( sj This module provides a newsuper() function in Python 2 that mimics the behaviour of super() in Python 3. It is designed to be used as follows: from __future__ import division, absolute_import, print_function from future.builtins import super And then, for example: class VerboseList(list): def append(self, item): print('Adding an item') super().append(item) # new simpler super() function Importing this module on Python 3 has no effect. This is based on (i.e. almost identical to) Ryan Kelly's magicsuper module here: https://github.com/rfk/magicsuper.git Excerpts from Ryan's docstring: "Of course, you can still explicitly pass in the arguments if you want to do something strange. Sometimes you really do want that, e.g. to skip over some classes in the method resolution order. "How does it work? By inspecting the calling frame to determine the function object being executed and the object on which it's being called, and then walking the object's __mro__ chain to find out where that function was defined. Yuck, but it seems to work..." i(tabsolute_importN(t FunctionType(tPY3tPY26icC@s¬|tkr‰tj|ƒ}y|j|jjd}Wn#ttfk r[tdƒ‚nXy |j }WnGt tfk r²y|j j }Wq³t k r®tdƒ‚q³XnXxÓ|D]¼}x²|j j ƒD]ž}yex^t|tƒs9t|tƒr|j}qÜy |j}WqÜt k r5|j|ƒ}qÜXqÜWWnt tfk rWqÐnX|j|jkrÐPqÐqÐWqºPqºWtdƒ‚n|tk r¢t||ƒSt|ƒS(sµLike builtin super(), but capable of magic. This acts just like the builtin super() function, but if called without any arguments it attempts to infer them at runtime. is'super() used in a function with no argss&super() used with a non-newstyle classssuper() called outside a method(t _SENTINELtsyst _getframetf_localstf_codet co_varnamest IndexErrortKeyErrort RuntimeErrort__mro__tAttributeErrort __class__t__dict__tvaluest isinstanceRtpropertytfgett__func__t__get__t TypeErrort func_codet_builtin_super(ttypt type_or_objt framedepthtftmrotmeth((sf/home/josie/.config/GIMP/2.10/plug-ins/export_layers/pygimplib/_lib/future/future/builtins/newsuper.pytnewsuper-sB         cO@s:tjdƒ}|jj}ttddƒ|ƒ||ŽS(NiRi(RRRtco_nametgetattrR (targstkwdsRtnm((sf/home/josie/.config/GIMP/2.10/plug-ins/export_layers/pygimplib/_lib/future/future/builtins/newsuper.pytsupermls R (t__doc__t __future__RRttypesRt future.utilsRRtsuperRtobjectRR R&t__all__(((sf/home/josie/.config/GIMP/2.10/plug-ins/export_layers/pygimplib/_lib/future/future/builtins/newsuper.pyt s  ? # future.moves package from __future__ import absolute_import import sys __future_module__ = True from future.standard_library import import_top_level_modules if sys.version_info[0] == 3: import_top_level_modules() from __future__ import absolute_import from future.utils import PY3 if PY3: from _dummy_thread import * else: __future_module__ = True from dummy_thread import * from __future__ import absolute_import from future.utils import PY3 if PY3: from _markupbase import * else: __future_module__ = True from markupbase import * from __future__ import absolute_import from future.utils import PY3 if PY3: from _thread import * else: __future_module__ = True from thread import * from __future__ import absolute_import from future.utils import PY3 if PY3: from builtins import * else: __future_module__ = True from __builtin__ import * # Overwrite any old definitions with the equivalent future.builtins ones: from future.builtins import * from __future__ import absolute_import import sys from future.utils import PY2, PY26 __future_module__ = True from collections import * if PY2: from UserDict import UserDict from UserList import UserList from UserString import UserString if PY26: from future.backports.misc import OrderedDict, Counter if sys.version_info < (3, 3): from future.backports.misc import ChainMap, _count_elements from __future__ import absolute_import from future.utils import PY2 if PY2: from ConfigParser import * else: from configparser import * from __future__ import absolute_import from future.utils import PY3 if PY3: from copyreg import * else: __future_module__ = True from copy_reg import * from __future__ import absolute_import from itertools import * try: zip_longest = izip_longest filterfalse = ifilterfalse except NameError: pass from __future__ import absolute_import from future.utils import PY3 if PY3: from pickle import * else: __future_module__ = True try: from cPickle import * except ImportError: from pickle import * from __future__ import absolute_import from future.utils import PY3 if PY3: from queue import * else: __future_module__ = True from Queue import * from __future__ import absolute_import from future.utils import PY3 if PY3: from reprlib import * else: __future_module__ = True from repr import * from __future__ import absolute_import from future.utils import PY3 if PY3: from socketserver import * else: __future_module__ = True from SocketServer import * from __future__ import absolute_import from future.utils import PY2, PY26 from subprocess import * if PY2: __future_module__ = True from commands import getoutput, getstatusoutput if PY26: from future.backports.misc import check_output from __future__ import absolute_import from future.utils import PY2 from sys import * if PY2: from __builtin__ import intern from __future__ import absolute_import from future.utils import PY3 if PY3: from winreg import * else: __future_module__ = True from _winreg import * from __future__ import absolute_import from future.utils import PY3 if PY3: from dbm import * else: __future_module__ = True from whichdb import * from anydbm import * # Py3.3's dbm/__init__.py imports ndbm but doesn't expose it via __all__. # In case some (badly written) code depends on dbm.ndbm after import dbm, # we simulate this: if PY3: from dbm import ndbm else: try: from future.moves.dbm import ndbm except ImportError: ndbm = None from __future__ import absolute_import from future.utils import PY3 if PY3: from dbm.dumb import * else: __future_module__ = True from dumbdbm import * from __future__ import absolute_import from future.utils import PY3 if PY3: from dbm.gnu import * else: __future_module__ = True from gdbm import * from __future__ import absolute_import from future.utils import PY3 if PY3: from dbm.ndbm import * else: __future_module__ = True from dbm import * from __future__ import absolute_import from future.utils import PY3 __future_module__ = True if PY3: from html import * else: # cgi.escape isn't good enough for the single Py3.3 html test to pass. # Define it inline here instead. From the Py3.4 stdlib. Note that the # html.escape() function from the Py3.3 stdlib is not suitable for use on # Py2.x. """ General functions for HTML manipulation. """ def escape(s, quote=True): """ Replace special characters "&", "<" and ">" to HTML-safe sequences. If the optional flag quote is true (the default), the quotation mark characters, both double quote (") and single quote (') characters are also translated. """ s = s.replace("&", "&") # Must be done first! s = s.replace("<", "<") s = s.replace(">", ">") if quote: s = s.replace('"', """) s = s.replace('\'', "'") return s __all__ = ['escape'] from __future__ import absolute_import from future.utils import PY3 if PY3: from html.entities import * else: __future_module__ = True from htmlentitydefs import * from __future__ import absolute_import from future.utils import PY3 __future_module__ = True if PY3: from html.parser import * else: from HTMLParser import * from future.utils import PY3 if not PY3: __future_module__ = True from future.utils import PY3 if PY3: from http.client import * else: from httplib import * from httplib import HTTPMessage __future_module__ = True from __future__ import absolute_import from future.utils import PY3 if PY3: from http.cookiejar import * else: __future_module__ = True from cookielib import * from __future__ import absolute_import from future.utils import PY3 if PY3: from http.cookies import * else: __future_module__ = True from Cookie import * from Cookie import Morsel # left out of __all__ on Py2.7! from __future__ import absolute_import from future.utils import PY3 if PY3: from http.server import * else: __future_module__ = True from BaseHTTPServer import * from CGIHTTPServer import * from SimpleHTTPServer import * try: from CGIHTTPServer import _url_collapse_path # needed for a test except ImportError: try: # Python 2.7.0 to 2.7.3 from CGIHTTPServer import ( _url_collapse_path_split as _url_collapse_path) except ImportError: # Doesn't exist on Python 2.6.x. Ignore it. pass from __future__ import absolute_import from future.utils import PY3 if not PY3: __future_module__ = True from __future__ import absolute_import from future.standard_library import suspend_hooks from future.utils import PY3 if PY3: from test.support import * else: __future_module__ = True with suspend_hooks(): from test.test_support import * from __future__ import absolute_import from future.utils import PY3 __future_module__ = True if not PY3: from Tkinter import * from Tkinter import (_cnfmerge, _default_root, _flatten, _join, _setit, _splitdict, _stringify, _support_default_root, _test, _tkinter) else: from tkinter import * from __future__ import absolute_import from future.utils import PY3 if PY3: from tkinter.colorchooser import * else: try: from tkColorChooser import * except ImportError: raise ImportError('The tkColorChooser module is missing. Does your Py2 ' 'installation include tkinter?') from __future__ import absolute_import from future.utils import PY3 if PY3: from tkinter.commondialog import * else: try: from tkCommonDialog import * except ImportError: raise ImportError('The tkCommonDialog module is missing. Does your Py2 ' 'installation include tkinter?') from __future__ import absolute_import from future.utils import PY3 if PY3: from tkinter.constants import * else: try: from Tkconstants import * except ImportError: raise ImportError('The Tkconstants module is missing. Does your Py2 ' 'installation include tkinter?') from __future__ import absolute_import from future.utils import PY3 if PY3: from tkinter.dialog import * else: try: from Dialog import * except ImportError: raise ImportError('The Dialog module is missing. Does your Py2 ' 'installation include tkinter?') from __future__ import absolute_import from future.utils import PY3 if PY3: from tkinter.dnd import * else: try: from Tkdnd import * except ImportError: raise ImportError('The Tkdnd module is missing. Does your Py2 ' 'installation include tkinter?') from __future__ import absolute_import from future.utils import PY3 if PY3: from tkinter.filedialog import * else: try: from FileDialog import * except ImportError: raise ImportError('The FileDialog module is missing. Does your Py2 ' 'installation include tkinter?') from __future__ import absolute_import from future.utils import PY3 if PY3: from tkinter.font import * else: try: from tkFont import * except ImportError: raise ImportError('The tkFont module is missing. Does your Py2 ' 'installation include tkinter?') from __future__ import absolute_import from future.utils import PY3 if PY3: from tkinter.messagebox import * else: try: from tkMessageBox import * except ImportError: raise ImportError('The tkMessageBox module is missing. Does your Py2 ' 'installation include tkinter?') from __future__ import absolute_import from future.utils import PY3 if PY3: from tkinter.scrolledtext import * else: try: from ScrolledText import * except ImportError: raise ImportError('The ScrolledText module is missing. Does your Py2 ' 'installation include tkinter?') from __future__ import absolute_import from future.utils import PY3 if PY3: from tkinter.simpledialog import * else: try: from SimpleDialog import * except ImportError: raise ImportError('The SimpleDialog module is missing. Does your Py2 ' 'installation include tkinter?') from __future__ import absolute_import from future.utils import PY3 if PY3: from tkinter.tix import * else: try: from Tix import * except ImportError: raise ImportError('The Tix module is missing. Does your Py2 ' 'installation include tkinter?') from __future__ import absolute_import from future.utils import PY3 if PY3: from tkinter.ttk import * else: try: from ttk import * except ImportError: raise ImportError('The ttk module is missing. Does your Py2 ' 'installation include tkinter?') from __future__ import absolute_import from future.utils import PY3 if not PY3: __future_module__ = True from __future__ import absolute_import from future.standard_library import suspend_hooks from future.utils import PY3 if PY3: from urllib.error import * else: __future_module__ = True # We use this method to get at the original Py2 urllib before any renaming magic # ContentTooShortError = sys.py2_modules['urllib'].ContentTooShortError with suspend_hooks(): from urllib import ContentTooShortError from urllib2 import URLError, HTTPError from __future__ import absolute_import from future.standard_library import suspend_hooks from future.utils import PY3 if PY3: from urllib.parse import * else: __future_module__ = True from urlparse import (ParseResult, SplitResult, parse_qs, parse_qsl, urldefrag, urljoin, urlparse, urlsplit, urlunparse, urlunsplit) # we use this method to get at the original py2 urllib before any renaming # quote = sys.py2_modules['urllib'].quote # quote_plus = sys.py2_modules['urllib'].quote_plus # unquote = sys.py2_modules['urllib'].unquote # unquote_plus = sys.py2_modules['urllib'].unquote_plus # urlencode = sys.py2_modules['urllib'].urlencode # splitquery = sys.py2_modules['urllib'].splitquery with suspend_hooks(): from urllib import (quote, quote_plus, unquote, unquote_plus, urlencode, splitquery) from __future__ import absolute_import from future.standard_library import suspend_hooks from future.utils import PY3 if PY3: from urllib.request import * # This aren't in __all__: from urllib.request import (getproxies, pathname2url, proxy_bypass, quote, request_host, splitattr, splithost, splitpasswd, splitport, splitquery, splittag, splittype, splituser, splitvalue, thishost, to_bytes, unquote, unwrap, url2pathname, urlcleanup, urljoin, urlopen, urlparse, urlretrieve, urlsplit, urlunparse) else: __future_module__ = True with suspend_hooks(): from urllib import * from urllib2 import * from urlparse import * # Rename: from urllib import toBytes # missing from __all__ on Py2.6 to_bytes = toBytes # from urllib import (pathname2url, # url2pathname, # getproxies, # urlretrieve, # urlcleanup, # URLopener, # FancyURLopener, # proxy_bypass) # from urllib2 import ( # AbstractBasicAuthHandler, # AbstractDigestAuthHandler, # BaseHandler, # CacheFTPHandler, # FileHandler, # FTPHandler, # HTTPBasicAuthHandler, # HTTPCookieProcessor, # HTTPDefaultErrorHandler, # HTTPDigestAuthHandler, # HTTPErrorProcessor, # HTTPHandler, # HTTPPasswordMgr, # HTTPPasswordMgrWithDefaultRealm, # HTTPRedirectHandler, # HTTPSHandler, # URLError, # build_opener, # install_opener, # OpenerDirector, # ProxyBasicAuthHandler, # ProxyDigestAuthHandler, # ProxyHandler, # Request, # UnknownHandler, # urlopen, # ) # from urlparse import ( # urldefrag # urljoin, # urlparse, # urlunparse, # urlsplit, # urlunsplit, # parse_qs, # parse_q" # ) from future import standard_library from future.utils import PY3 if PY3: from urllib.response import * else: __future_module__ = True with standard_library.suspend_hooks(): from urllib import (addbase, addclosehook, addinfo, addinfourl) from __future__ import absolute_import from future.utils import PY3 if PY3: from urllib.robotparser import * else: __future_module__ = True from robotparser import * from __future__ import absolute_import from future.utils import PY3 if PY3: from xmlrpc.client import * else: from xmlrpclib import * from __future__ import absolute_import from future.utils import PY3 if PY3: from xmlrpc.server import * else: from xmlrpclib import * """ Python 3 reorganized the standard library (PEP 3108). This module exposes several standard library modules to Python 2 under their new Python 3 names. It is designed to be used as follows:: from future import standard_library standard_library.install_aliases() And then these normal Py3 imports work on both Py3 and Py2:: import builtins import copyreg import queue import reprlib import socketserver import winreg # on Windows only import test.support import html, html.parser, html.entites import http, http.client, http.server import http.cookies, http.cookiejar import urllib.parse, urllib.request, urllib.response, urllib.error, urllib.robotparser import xmlrpc.client, xmlrpc.server import _thread import _dummy_thread import _markupbase from itertools import filterfalse, zip_longest from sys import intern from collections import UserDict, UserList, UserString from collections import OrderedDict, Counter # even on Py2.6 from subprocess import getoutput, getstatusoutput from subprocess import check_output # even on Py2.6 (The renamed modules and functions are still available under their old names on Python 2.) This is a cleaner alternative to this idiom (see http://docs.pythonsprints.com/python3_porting/py-porting.html):: try: import queue except ImportError: import Queue as queue Limitations ----------- We don't currently support these modules, but would like to:: import dbm import dbm.dumb import dbm.gnu import collections.abc # on Py33 import pickle # should (optionally) bring in cPickle on Python 2 """ from __future__ import absolute_import, division, print_function import sys import logging import imp import contextlib import types import copy import os # Make a dedicated logger; leave the root logger to be configured # by the application. flog = logging.getLogger('future_stdlib') _formatter = logging.Formatter(logging.BASIC_FORMAT) _handler = logging.StreamHandler() _handler.setFormatter(_formatter) flog.addHandler(_handler) flog.setLevel(logging.WARN) from future.utils import PY2, PY3 # The modules that are defined under the same names on Py3 but with # different contents in a significant way (e.g. submodules) are: # pickle (fast one) # dbm # urllib # test # email REPLACED_MODULES = set(['test', 'urllib', 'pickle', 'dbm']) # add email and dbm when we support it # The following module names are not present in Python 2.x, so they cause no # potential clashes between the old and new names: # http # html # tkinter # xmlrpc # Keys: Py2 / real module names # Values: Py3 / simulated module names RENAMES = { # 'cStringIO': 'io', # there's a new io module in Python 2.6 # that provides StringIO and BytesIO # 'StringIO': 'io', # ditto # 'cPickle': 'pickle', '__builtin__': 'builtins', 'copy_reg': 'copyreg', 'Queue': 'queue', 'future.moves.socketserver': 'socketserver', 'ConfigParser': 'configparser', 'repr': 'reprlib', # 'FileDialog': 'tkinter.filedialog', # 'tkFileDialog': 'tkinter.filedialog', # 'SimpleDialog': 'tkinter.simpledialog', # 'tkSimpleDialog': 'tkinter.simpledialog', # 'tkColorChooser': 'tkinter.colorchooser', # 'tkCommonDialog': 'tkinter.commondialog', # 'Dialog': 'tkinter.dialog', # 'Tkdnd': 'tkinter.dnd', # 'tkFont': 'tkinter.font', # 'tkMessageBox': 'tkinter.messagebox', # 'ScrolledText': 'tkinter.scrolledtext', # 'Tkconstants': 'tkinter.constants', # 'Tix': 'tkinter.tix', # 'ttk': 'tkinter.ttk', # 'Tkinter': 'tkinter', '_winreg': 'winreg', 'thread': '_thread', 'dummy_thread': '_dummy_thread', # 'anydbm': 'dbm', # causes infinite import loop # 'whichdb': 'dbm', # causes infinite import loop # anydbm and whichdb are handled by fix_imports2 # 'dbhash': 'dbm.bsd', # 'dumbdbm': 'dbm.dumb', # 'dbm': 'dbm.ndbm', # 'gdbm': 'dbm.gnu', 'future.moves.xmlrpc': 'xmlrpc', # 'future.backports.email': 'email', # for use by urllib # 'DocXMLRPCServer': 'xmlrpc.server', # 'SimpleXMLRPCServer': 'xmlrpc.server', # 'httplib': 'http.client', # 'htmlentitydefs' : 'html.entities', # 'HTMLParser' : 'html.parser', # 'Cookie': 'http.cookies', # 'cookielib': 'http.cookiejar', # 'BaseHTTPServer': 'http.server', # 'SimpleHTTPServer': 'http.server', # 'CGIHTTPServer': 'http.server', # 'future.backports.test': 'test', # primarily for renaming test_support to support # 'commands': 'subprocess', # 'urlparse' : 'urllib.parse', # 'robotparser' : 'urllib.robotparser', # 'abc': 'collections.abc', # for Py33 # 'future.utils.six.moves.html': 'html', # 'future.utils.six.moves.http': 'http', 'future.moves.html': 'html', 'future.moves.http': 'http', # 'future.backports.urllib': 'urllib', # 'future.utils.six.moves.urllib': 'urllib', 'future.moves._markupbase': '_markupbase', } # It is complicated and apparently brittle to mess around with the # ``sys.modules`` cache in order to support "import urllib" meaning two # different things (Py2.7 urllib and backported Py3.3-like urllib) in different # contexts. So we require explicit imports for these modules. assert len(set(RENAMES.values()) & set(REPLACED_MODULES)) == 0 # Harmless renames that we can insert. # These modules need names from elsewhere being added to them: # subprocess: should provide getoutput and other fns from commands # module but these fns are missing: getstatus, mk2arg, # mkarg # re: needs an ASCII constant that works compatibly with Py3 # etc: see lib2to3/fixes/fix_imports.py # (New module name, new object name, old module name, old object name) MOVES = [('collections', 'UserList', 'UserList', 'UserList'), ('collections', 'UserDict', 'UserDict', 'UserDict'), ('collections', 'UserString','UserString', 'UserString'), ('itertools', 'filterfalse','itertools', 'ifilterfalse'), ('itertools', 'zip_longest','itertools', 'izip_longest'), ('sys', 'intern','__builtin__', 'intern'), # The re module has no ASCII flag in Py2, but this is the default. # Set re.ASCII to a zero constant. stat.ST_MODE just happens to be one # (and it exists on Py2.6+). ('re', 'ASCII','stat', 'ST_MODE'), ('base64', 'encodebytes','base64', 'encodestring'), ('base64', 'decodebytes','base64', 'decodestring'), ('subprocess', 'getoutput', 'commands', 'getoutput'), ('subprocess', 'getstatusoutput', 'commands', 'getstatusoutput'), ('subprocess', 'check_output', 'future.backports.misc', 'check_output'), ('math', 'ceil', 'future.backports.misc', 'ceil'), ('collections', 'OrderedDict', 'future.backports.misc', 'OrderedDict'), ('collections', 'Counter', 'future.backports.misc', 'Counter'), ('itertools', 'count', 'future.backports.misc', 'count'), ('reprlib', 'recursive_repr', 'future.backports.misc', 'recursive_repr'), ('functools', 'cmp_to_key', 'future.backports.misc', 'cmp_to_key'), # This is no use, since "import urllib.request" etc. still fails: # ('urllib', 'error', 'future.moves.urllib', 'error'), # ('urllib', 'parse', 'future.moves.urllib', 'parse'), # ('urllib', 'request', 'future.moves.urllib', 'request'), # ('urllib', 'response', 'future.moves.urllib', 'response'), # ('urllib', 'robotparser', 'future.moves.urllib', 'robotparser'), ] # A minimal example of an import hook: # class WarnOnImport(object): # def __init__(self, *args): # self.module_names = args # # def find_module(self, fullname, path=None): # if fullname in self.module_names: # self.path = path # return self # return None # # def load_module(self, name): # if name in sys.modules: # return sys.modules[name] # module_info = imp.find_module(name, self.path) # module = imp.load_module(name, *module_info) # sys.modules[name] = module # flog.warning("Imported deprecated module %s", name) # return module class RenameImport(object): """ A class for import hooks mapping Py3 module names etc. to the Py2 equivalents. """ # Different RenameImport classes are created when importing this module from # different source files. This causes isinstance(hook, RenameImport) checks # to produce inconsistent results. We add this RENAMER attribute here so # remove_hooks() and install_hooks() can find instances of these classes # easily: RENAMER = True def __init__(self, old_to_new): ''' Pass in a dictionary-like object mapping from old names to new names. E.g. {'ConfigParser': 'configparser', 'cPickle': 'pickle'} ''' self.old_to_new = old_to_new both = set(old_to_new.keys()) & set(old_to_new.values()) assert (len(both) == 0 and len(set(old_to_new.values())) == len(old_to_new.values())), \ 'Ambiguity in renaming (handler not implemented)' self.new_to_old = dict((new, old) for (old, new) in old_to_new.items()) def find_module(self, fullname, path=None): # Handles hierarchical importing: package.module.module2 new_base_names = set([s.split('.')[0] for s in self.new_to_old]) # Before v0.12: Was: if fullname in set(self.old_to_new) | new_base_names: if fullname in new_base_names: return self return None def load_module(self, name): path = None if name in sys.modules: return sys.modules[name] elif name in self.new_to_old: # New name. Look up the corresponding old (Py2) name: oldname = self.new_to_old[name] module = self._find_and_load_module(oldname) # module.__future_module__ = True else: module = self._find_and_load_module(name) # In any case, make it available under the requested (Py3) name sys.modules[name] = module return module def _find_and_load_module(self, name, path=None): """ Finds and loads it. But if there's a . in the name, handles it properly. """ bits = name.split('.') while len(bits) > 1: # Treat the first bit as a package packagename = bits.pop(0) package = self._find_and_load_module(packagename, path) try: path = package.__path__ except AttributeError: # This could be e.g. moves. flog.debug('Package {0} has no __path__.'.format(package)) if name in sys.modules: return sys.modules[name] flog.debug('What to do here?') name = bits[0] module_info = imp.find_module(name, path) return imp.load_module(name, *module_info) class hooks(object): """ Acts as a context manager. Saves the state of sys.modules and restores it after the 'with' block. Use like this: >>> from future import standard_library >>> with standard_library.hooks(): ... import http.client >>> import requests For this to work, http.client will be scrubbed from sys.modules after the 'with' block. That way the modules imported in the 'with' block will continue to be accessible in the current namespace but not from any imported modules (like requests). """ def __enter__(self): # flog.debug('Entering hooks context manager') self.old_sys_modules = copy.copy(sys.modules) self.hooks_were_installed = detect_hooks() # self.scrubbed = scrub_py2_sys_modules() install_hooks() return self def __exit__(self, *args): # flog.debug('Exiting hooks context manager') # restore_sys_modules(self.scrubbed) if not self.hooks_were_installed: remove_hooks() # scrub_future_sys_modules() # Sanity check for is_py2_stdlib_module(): We aren't replacing any # builtin modules names: if PY2: assert len(set(RENAMES.values()) & set(sys.builtin_module_names)) == 0 def is_py2_stdlib_module(m): """ Tries to infer whether the module m is from the Python 2 standard library. This may not be reliable on all systems. """ if PY3: return False if not 'stdlib_path' in is_py2_stdlib_module.__dict__: stdlib_files = [contextlib.__file__, os.__file__, copy.__file__] stdlib_paths = [os.path.split(f)[0] for f in stdlib_files] if not len(set(stdlib_paths)) == 1: # This seems to happen on travis-ci.org. Very strange. We'll try to # ignore it. flog.warn('Multiple locations found for the Python standard ' 'library: %s' % stdlib_paths) # Choose the first one arbitrarily is_py2_stdlib_module.stdlib_path = stdlib_paths[0] if m.__name__ in sys.builtin_module_names: return True if hasattr(m, '__file__'): modpath = os.path.split(m.__file__) if (modpath[0].startswith(is_py2_stdlib_module.stdlib_path) and 'site-packages' not in modpath[0]): return True return False def scrub_py2_sys_modules(): """ Removes any Python 2 standard library modules from ``sys.modules`` that would interfere with Py3-style imports using import hooks. Examples are modules with the same names (like urllib or email). (Note that currently import hooks are disabled for modules like these with ambiguous names anyway ...) """ if PY3: return {} scrubbed = {} for modulename in REPLACED_MODULES & set(RENAMES.keys()): if not modulename in sys.modules: continue module = sys.modules[modulename] if is_py2_stdlib_module(module): flog.debug('Deleting (Py2) {} from sys.modules'.format(modulename)) scrubbed[modulename] = sys.modules[modulename] del sys.modules[modulename] return scrubbed def scrub_future_sys_modules(): """ Deprecated. """ return {} class suspend_hooks(object): """ Acts as a context manager. Use like this: >>> from future import standard_library >>> standard_library.install_hooks() >>> import http.client >>> # ... >>> with standard_library.suspend_hooks(): >>> import requests # incompatible with ``future``'s standard library hooks If the hooks were disabled before the context, they are not installed when the context is left. """ def __enter__(self): self.hooks_were_installed = detect_hooks() remove_hooks() # self.scrubbed = scrub_future_sys_modules() return self def __exit__(self, *args): if self.hooks_were_installed: install_hooks() # restore_sys_modules(self.scrubbed) def restore_sys_modules(scrubbed): """ Add any previously scrubbed modules back to the sys.modules cache, but only if it's safe to do so. """ clash = set(sys.modules) & set(scrubbed) if len(clash) != 0: # If several, choose one arbitrarily to raise an exception about first = list(clash)[0] raise ImportError('future module {} clashes with Py2 module' .format(first)) sys.modules.update(scrubbed) def install_aliases(): """ Monkey-patches the standard library in Py2.6/7 to provide aliases for better Py3 compatibility. """ if PY3: return # if hasattr(install_aliases, 'run_already'): # return for (newmodname, newobjname, oldmodname, oldobjname) in MOVES: __import__(newmodname) # We look up the module in sys.modules because __import__ just returns the # top-level package: newmod = sys.modules[newmodname] # newmod.__future_module__ = True __import__(oldmodname) oldmod = sys.modules[oldmodname] obj = getattr(oldmod, oldobjname) setattr(newmod, newobjname, obj) # Hack for urllib so it appears to have the same structure on Py2 as on Py3 import urllib from future.backports.urllib import request from future.backports.urllib import response from future.backports.urllib import parse from future.backports.urllib import error from future.backports.urllib import robotparser urllib.request = request urllib.response = response urllib.parse = parse urllib.error = error urllib.robotparser = robotparser sys.modules['urllib.request'] = request sys.modules['urllib.response'] = response sys.modules['urllib.parse'] = parse sys.modules['urllib.error'] = error sys.modules['urllib.robotparser'] = robotparser # Patch the test module so it appears to have the same structure on Py2 as on Py3 try: import test except ImportError: pass try: from future.moves.test import support except ImportError: pass else: test.support = support sys.modules['test.support'] = support # Patch the dbm module so it appears to have the same structure on Py2 as on Py3 try: import dbm except ImportError: pass else: from future.moves.dbm import dumb dbm.dumb = dumb sys.modules['dbm.dumb'] = dumb try: from future.moves.dbm import gnu except ImportError: pass else: dbm.gnu = gnu sys.modules['dbm.gnu'] = gnu try: from future.moves.dbm import ndbm except ImportError: pass else: dbm.ndbm = ndbm sys.modules['dbm.ndbm'] = ndbm # install_aliases.run_already = True def install_hooks(): """ This function installs the future.standard_library import hook into sys.meta_path. """ if PY3: return install_aliases() flog.debug('sys.meta_path was: {0}'.format(sys.meta_path)) flog.debug('Installing hooks ...') # Add it unless it's there already newhook = RenameImport(RENAMES) if not detect_hooks(): sys.meta_path.append(newhook) flog.debug('sys.meta_path is now: {0}'.format(sys.meta_path)) def enable_hooks(): """ Deprecated. Use install_hooks() instead. This will be removed by ``future`` v1.0. """ install_hooks() def remove_hooks(scrub_sys_modules=False): """ This function removes the import hook from sys.meta_path. """ if PY3: return flog.debug('Uninstalling hooks ...') # Loop backwards, so deleting items keeps the ordering: for i, hook in list(enumerate(sys.meta_path))[::-1]: if hasattr(hook, 'RENAMER'): del sys.meta_path[i] # Explicit is better than implicit. In the future the interface should # probably change so that scrubbing the import hooks requires a separate # function call. Left as is for now for backward compatibility with # v0.11.x. if scrub_sys_modules: scrub_future_sys_modules() def disable_hooks(): """ Deprecated. Use remove_hooks() instead. This will be removed by ``future`` v1.0. """ remove_hooks() def detect_hooks(): """ Returns True if the import hooks are installed, False if not. """ flog.debug('Detecting hooks ...') present = any([hasattr(hook, 'RENAMER') for hook in sys.meta_path]) if present: flog.debug('Detected.') else: flog.debug('Not detected.') return present # As of v0.12, this no longer happens implicitly: # if not PY3: # install_hooks() if not hasattr(sys, 'py2_modules'): sys.py2_modules = {} def cache_py2_modules(): """ Currently this function is unneeded, as we are not attempting to provide import hooks for modules with ambiguous names: email, urllib, pickle. """ if len(sys.py2_modules) != 0: return assert not detect_hooks() import urllib sys.py2_modules['urllib'] = urllib import email sys.py2_modules['email'] = email import pickle sys.py2_modules['pickle'] = pickle # Not all Python installations have test module. (Anaconda doesn't, for example.) # try: # import test # except ImportError: # sys.py2_modules['test'] = None # sys.py2_modules['test'] = test # import dbm # sys.py2_modules['dbm'] = dbm def import_(module_name, backport=False): """ Pass a (potentially dotted) module name of a Python 3 standard library module. This function imports the module compatibly on Py2 and Py3 and returns the top-level module. Example use: >>> http = import_('http.client') >>> http = import_('http.server') >>> urllib = import_('urllib.request') Then: >>> conn = http.client.HTTPConnection(...) >>> response = urllib.request.urlopen('http://mywebsite.com') >>> # etc. Use as follows: >>> package_name = import_(module_name) On Py3, equivalent to this: >>> import module_name On Py2, equivalent to this if backport=False: >>> from future.moves import module_name or to this if backport=True: >>> from future.backports import module_name except that it also handles dotted module names such as ``http.client`` The effect then is like this: >>> from future.backports import module >>> from future.backports.module import submodule >>> module.submodule = submodule Note that this would be a SyntaxError in Python: >>> from future.backports import http.client """ # Python 2.6 doesn't have importlib in the stdlib, so it requires # the backported ``importlib`` package from PyPI as a dependency to use # this function: import importlib if PY3: return __import__(module_name) else: # client.blah = blah # Then http.client = client # etc. if backport: prefix = 'future.backports' else: prefix = 'future.moves' parts = prefix.split('.') + module_name.split('.') modules = [] for i, part in enumerate(parts): sofar = '.'.join(parts[:i+1]) modules.append(importlib.import_module(sofar)) for i, part in reversed(list(enumerate(parts))): if i == 0: break setattr(modules[i-1], part, modules[i]) # Return the next-most top-level module after future.backports / future.moves: return modules[2] def from_import(module_name, *symbol_names, **kwargs): """ Example use: >>> HTTPConnection = from_import('http.client', 'HTTPConnection') >>> HTTPServer = from_import('http.server', 'HTTPServer') >>> urlopen, urlparse = from_import('urllib.request', 'urlopen', 'urlparse') Equivalent to this on Py3: >>> from module_name import symbol_names[0], symbol_names[1], ... and this on Py2: >>> from future.moves.module_name import symbol_names[0], ... or: >>> from future.backports.module_name import symbol_names[0], ... except that it also handles dotted module names such as ``http.client``. """ if PY3: return __import__(module_name) else: if 'backport' in kwargs and bool(kwargs['backport']): prefix = 'future.backports' else: prefix = 'future.moves' parts = prefix.split('.') + module_name.split('.') module = importlib.import_module(prefix + '.' + module_name) output = [getattr(module, name) for name in symbol_names] if len(output) == 1: return output[0] else: return output class exclude_local_folder_imports(object): """ A context-manager that prevents standard library modules like configparser from being imported from the local python-future source folder on Py3. (This was need prior to v0.16.0 because the presence of a configparser folder would otherwise have prevented setuptools from running on Py3. Maybe it's not needed any more?) """ def __init__(self, *args): assert len(args) > 0 self.module_names = args # Disallow dotted module names like http.client: if any(['.' in m for m in self.module_names]): raise NotImplementedError('Dotted module names are not supported') def __enter__(self): self.old_sys_path = copy.copy(sys.path) self.old_sys_modules = copy.copy(sys.modules) if sys.version_info[0] < 3: return # The presence of all these indicates we've found our source folder, # because `builtins` won't have been installed in site-packages by setup.py: FUTURE_SOURCE_SUBFOLDERS = ['future', 'past', 'libfuturize', 'libpasteurize', 'builtins'] # Look for the future source folder: for folder in self.old_sys_path: if all([os.path.exists(os.path.join(folder, subfolder)) for subfolder in FUTURE_SOURCE_SUBFOLDERS]): # Found it. Remove it. sys.path.remove(folder) # Ensure we import the system module: for m in self.module_names: # Delete the module and any submodules from sys.modules: # for key in list(sys.modules): # if key == m or key.startswith(m + '.'): # try: # del sys.modules[key] # except KeyError: # pass try: module = __import__(m, level=0) except ImportError: # There's a problem importing the system module. E.g. the # winreg module is not available except on Windows. pass def __exit__(self, *args): # Restore sys.path and sys.modules: sys.path = self.old_sys_path for m in set(self.old_sys_modules.keys()) - set(sys.modules.keys()): sys.modules[m] = self.old_sys_modules[m] TOP_LEVEL_MODULES = ['builtins', 'copyreg', 'html', 'http', 'queue', 'reprlib', 'socketserver', 'test', 'tkinter', 'winreg', 'xmlrpc', '_dummy_thread', '_markupbase', '_thread', ] def import_top_level_modules(): with exclude_local_folder_imports(*TOP_LEVEL_MODULES): for m in TOP_LEVEL_MODULES: try: __import__(m) except ImportError: # e.g. winreg pass