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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, ChainMap     # 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'