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annotate mercurial/pycompat.py @ 31433:4acc49335a6e

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py3: optimize py3 compat.bytechr using Struct.pack With Python 3.4.3, timeit says 0.437 usec -> 0.0685 usec. With Python 3.6, timeit says 0.157 usec -> 0.0907 usec. So it's faster on both versions, but the speedup varies a lot. Thanks to Gregory Szorc for the suggestion.
author Martin von Zweigbergk <martinvonz@google.com>
date Wed, 15 Mar 2017 09:30:50 -0700
parents fb1f70331ee6
children 63a39d647888
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # pycompat.py - portability shim for python 3
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2 #
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3 # This software may be used and distributed according to the terms of the
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4 # GNU General Public License version 2 or any later version.
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5
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6 """Mercurial portability shim for python 3.
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7
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8 This contains aliases to hide python version-specific details from the core.
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9 """
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10
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11 from __future__ import absolute_import
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12
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13 import getopt
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14 import os
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15 import shlex
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16 import sys
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17
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18 ispy3 = (sys.version_info[0] >= 3)
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19
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20 if not ispy3:
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21 import cPickle as pickle
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22 import httplib
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23 import Queue as _queue
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24 import SocketServer as socketserver
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25 import urlparse
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26 urlunquote = urlparse.unquote
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27 import xmlrpclib
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28 else:
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29 import http.client as httplib
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30 import pickle
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31 import queue as _queue
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32 import socketserver
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33 import urllib.parse as urlparse
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34 urlunquote = urlparse.unquote_to_bytes
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35 import xmlrpc.client as xmlrpclib
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36
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37 if ispy3:
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38 import builtins
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39 import functools
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40 import io
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41 import struct
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42
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43 fsencode = os.fsencode
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44 fsdecode = os.fsdecode
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45 # A bytes version of os.name.
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46 osname = os.name.encode('ascii')
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47 ospathsep = os.pathsep.encode('ascii')
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48 ossep = os.sep.encode('ascii')
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49 osaltsep = os.altsep
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50 if osaltsep:
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51 osaltsep = osaltsep.encode('ascii')
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52 # os.getcwd() on Python 3 returns string, but it has os.getcwdb() which
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53 # returns bytes.
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54 getcwd = os.getcwdb
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55 sysplatform = sys.platform.encode('ascii')
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56 sysexecutable = sys.executable
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57 if sysexecutable:
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58 sysexecutable = os.fsencode(sysexecutable)
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59 stringio = io.BytesIO
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60
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61 # TODO: .buffer might not exist if std streams were replaced; we'll need
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62 # a silly wrapper to make a bytes stream backed by a unicode one.
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63 stdin = sys.stdin.buffer
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64 stdout = sys.stdout.buffer
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65 stderr = sys.stderr.buffer
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66
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67 # Since Python 3 converts argv to wchar_t type by Py_DecodeLocale() on Unix,
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68 # we can use os.fsencode() to get back bytes argv.
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69 #
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70 # https://hg.python.org/cpython/file/v3.5.1/Programs/python.c#l55
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71 #
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72 # TODO: On Windows, the native argv is wchar_t, so we'll need a different
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73 # workaround to simulate the Python 2 (i.e. ANSI Win32 API) behavior.
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74 if getattr(sys, 'argv', None) is not None:
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75 sysargv = list(map(os.fsencode, sys.argv))
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76
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77 bytechr = struct.Struct('>B').pack
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78
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79 def iterbytestr(s):
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80 """Iterate bytes as if it were a str object of Python 2"""
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81 return iter(s[i:i + 1] for i in range(len(s)))
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82
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83 def sysstr(s):
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84 """Return a keyword str to be passed to Python functions such as
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85 getattr() and str.encode()
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86
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87 This never raises UnicodeDecodeError. Non-ascii characters are
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88 considered invalid and mapped to arbitrary but unique code points
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89 such that 'sysstr(a) != sysstr(b)' for all 'a != b'.
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90 """
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91 if isinstance(s, builtins.str):
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92 return s
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93 return s.decode(u'latin-1')
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94
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95 def _wrapattrfunc(f):
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96 @functools.wraps(f)
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97 def w(object, name, *args):
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98 return f(object, sysstr(name), *args)
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99 return w
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100
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101 # these wrappers are automagically imported by hgloader
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102 delattr = _wrapattrfunc(builtins.delattr)
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103 getattr = _wrapattrfunc(builtins.getattr)
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104 hasattr = _wrapattrfunc(builtins.hasattr)
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105 setattr = _wrapattrfunc(builtins.setattr)
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106 xrange = builtins.range
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107
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108 def open(name, mode='r', buffering=-1):
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109 return builtins.open(name, sysstr(mode), buffering)
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110
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111 # getopt.getopt() on Python 3 deals with unicodes internally so we cannot
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112 # pass bytes there. Passing unicodes will result in unicodes as return
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113 # values which we need to convert again to bytes.
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114 def getoptb(args, shortlist, namelist):
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115 args = [a.decode('latin-1') for a in args]
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116 shortlist = shortlist.decode('latin-1')
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117 namelist = [a.decode('latin-1') for a in namelist]
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118 opts, args = getopt.getopt(args, shortlist, namelist)
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119 opts = [(a[0].encode('latin-1'), a[1].encode('latin-1'))
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120 for a in opts]
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121 args = [a.encode('latin-1') for a in args]
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122 return opts, args
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123
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124 # keys of keyword arguments in Python need to be strings which are unicodes
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125 # Python 3. This function takes keyword arguments, convert the keys to str.
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126 def strkwargs(dic):
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127 dic = dict((k.decode('latin-1'), v) for k, v in dic.iteritems())
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diff changeset
128 return dic
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diff changeset
129
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diff changeset
130 # keys of keyword arguments need to be unicode while passing into
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131 # a function. This function helps us to convert those keys back to bytes
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diff changeset
132 # again as we need to deal with bytes.
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133 def byteskwargs(dic):
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diff changeset
134 dic = dict((k.encode('latin-1'), v) for k, v in dic.iteritems())
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diff changeset
135 return dic
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diff changeset
136
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137 # shlex.split() accepts unicodes on Python 3. This function takes bytes
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138 # argument, convert it into unicodes, pass into shlex.split(), convert the
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139 # returned value to bytes and return that.
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140 # TODO: handle shlex.shlex().
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diff changeset
141 def shlexsplit(s):
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diff changeset
142 ret = shlex.split(s.decode('latin-1'))
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143 return [a.encode('latin-1') for a in ret]
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144
30032
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145 else:
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146 import cStringIO
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147
31263
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148 bytechr = chr
31391
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diff changeset
149 iterbytestr = iter
31263
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diff changeset
150
30032
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151 def sysstr(s):
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152 return s
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diff changeset
153
30133
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Martijn Pieters <mjpieters@fb.com>
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154 # Partial backport from os.py in Python 3, which only accepts bytes.
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155 # In Python 2, our paths should only ever be bytes, a unicode path
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diff changeset
156 # indicates a bug.
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Martijn Pieters <mjpieters@fb.com>
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diff changeset
157 def fsencode(filename):
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Martijn Pieters <mjpieters@fb.com>
parents: 30119
diff changeset
158 if isinstance(filename, str):
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diff changeset
159 return filename
30119
f4a5e0e86a7e py3: add an os.fsencode backport to ease path handling
Martijn Pieters <mjpieters@fb.com>
parents: 30086
diff changeset
160 else:
30133
f6dcda7505f9 pycompat: only accept a bytestring filepath in Python 2
Martijn Pieters <mjpieters@fb.com>
parents: 30119
diff changeset
161 raise TypeError(
f6dcda7505f9 pycompat: only accept a bytestring filepath in Python 2
Martijn Pieters <mjpieters@fb.com>
parents: 30119
diff changeset
162 "expect str, not %s" % type(filename).__name__)
30119
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Martijn Pieters <mjpieters@fb.com>
parents: 30086
diff changeset
163
30313
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diff changeset
164 # In Python 2, fsdecode() has a very chance to receive bytes. So it's
42af0590f4b9 py3: add os.fsdecode() as pycompat.fsdecode()
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diff changeset
165 # better not to touch Python 2 part as it's already working fine.
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diff changeset
166 def fsdecode(filename):
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diff changeset
167 return filename
42af0590f4b9 py3: add os.fsdecode() as pycompat.fsdecode()
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diff changeset
168
30583
c6ce11f2ee50 py3: make a bytes version of getopt.getopt()
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diff changeset
169 def getoptb(args, shortlist, namelist):
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diff changeset
170 return getopt.getopt(args, shortlist, namelist)
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diff changeset
171
30584
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diff changeset
172 def strkwargs(dic):
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diff changeset
173 return dic
fbc3f73dc802 py3: utility functions to convert keys of kwargs to bytes/unicodes
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parents: 30583
diff changeset
174
fbc3f73dc802 py3: utility functions to convert keys of kwargs to bytes/unicodes
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diff changeset
175 def byteskwargs(dic):
fbc3f73dc802 py3: utility functions to convert keys of kwargs to bytes/unicodes
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diff changeset
176 return dic
fbc3f73dc802 py3: utility functions to convert keys of kwargs to bytes/unicodes
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diff changeset
177
30315
3874ddba1ab4 py3: add a bytes version of os.name
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parents: 30313
diff changeset
178 osname = os.name
30316
ad40d307a9f0 py3: have pycompat.ospathsep and pycompat.ossep
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parents: 30315
diff changeset
179 ospathsep = os.pathsep
ad40d307a9f0 py3: have pycompat.ospathsep and pycompat.ossep
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parents: 30315
diff changeset
180 ossep = os.sep
30628
c6026c20a3ce py3: have a bytes version of os.altsep
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parents: 30584
diff changeset
181 osaltsep = os.altsep
30481
277f4fe6d01a py3: provide bytes stdin/out/err through util module
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parents: 30344
diff changeset
182 stdin = sys.stdin
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parents: 30344
diff changeset
183 stdout = sys.stdout
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diff changeset
184 stderr = sys.stderr
30888
86cd1f2cfff5 pycompat: verify sys.argv exists before forwarding it (issue5493)
Augie Fackler <augie@google.com>
parents: 30820
diff changeset
185 if getattr(sys, 'argv', None) is not None:
86cd1f2cfff5 pycompat: verify sys.argv exists before forwarding it (issue5493)
Augie Fackler <augie@google.com>
parents: 30820
diff changeset
186 sysargv = sys.argv
30629
a82a6eee2613 py3: have a bytes version of sys.platform
Pulkit Goyal <7895pulkit@gmail.com>
parents: 30628
diff changeset
187 sysplatform = sys.platform
30509
fc0cfe6c87d7 py3: add os.getcwdb() to have bytes path
Pulkit Goyal <7895pulkit@gmail.com>
parents: 30481
diff changeset
188 getcwd = os.getcwd
30671
3fcaf0f660ce py3: have bytes version of sys.executable
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parents: 30666
diff changeset
189 sysexecutable = sys.executable
30681
caf7e1c5efe4 py3: have a bytes version of shlex.split()
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diff changeset
190 shlexsplit = shlex.split
31381
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diff changeset
191 stringio = cStringIO.StringIO
30315
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Pulkit Goyal <7895pulkit@gmail.com>
parents: 30313
diff changeset
192
28818
6041fb8f2da8 pycompat: add empty and queue to handle py3 divergence
timeless <timeless@mozdev.org>
parents:
diff changeset
193 empty = _queue.Empty
6041fb8f2da8 pycompat: add empty and queue to handle py3 divergence
timeless <timeless@mozdev.org>
parents:
diff changeset
194 queue = _queue.Queue
28834
2fac032c1269 pycompat: alias xrange to range in py3
timeless <timeless@mozdev.org>
parents: 28833
diff changeset
195
28882
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timeless <timeless@mozdev.org>
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diff changeset
196 class _pycompatstub(object):
29812
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diff changeset
197 def __init__(self):
c63ab0524db7 pycompat: delay loading modules registered to stub
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diff changeset
198 self._aliases = {}
28882
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timeless <timeless@mozdev.org>
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diff changeset
199
29812
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diff changeset
200 def _registeraliases(self, origin, items):
c63ab0524db7 pycompat: delay loading modules registered to stub
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diff changeset
201 """Add items that will be populated at the first access"""
30086
f3a1089654e3 pycompat: when setting attrs, ensure we use sysstr
Augie Fackler <augie@google.com>
parents: 30032
diff changeset
202 items = map(sysstr, items)
f3a1089654e3 pycompat: when setting attrs, ensure we use sysstr
Augie Fackler <augie@google.com>
parents: 30032
diff changeset
203 self._aliases.update(
f3a1089654e3 pycompat: when setting attrs, ensure we use sysstr
Augie Fackler <augie@google.com>
parents: 30032
diff changeset
204 (item.replace(sysstr('_'), sysstr('')).lower(), (origin, item))
f3a1089654e3 pycompat: when setting attrs, ensure we use sysstr
Augie Fackler <augie@google.com>
parents: 30032
diff changeset
205 for item in items)
28882
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timeless <timeless@mozdev.org>
parents: 28835
diff changeset
206
29812
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diff changeset
207 def __getattr__(self, name):
28882
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timeless <timeless@mozdev.org>
parents: 28835
diff changeset
208 try:
29812
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parents: 29811
diff changeset
209 origin, item = self._aliases[name]
c63ab0524db7 pycompat: delay loading modules registered to stub
Yuya Nishihara <yuya@tcha.org>
parents: 29811
diff changeset
210 except KeyError:
c63ab0524db7 pycompat: delay loading modules registered to stub
Yuya Nishihara <yuya@tcha.org>
parents: 29811
diff changeset
211 raise AttributeError(name)
c63ab0524db7 pycompat: delay loading modules registered to stub
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parents: 29811
diff changeset
212 self.__dict__[name] = obj = getattr(origin, item)
c63ab0524db7 pycompat: delay loading modules registered to stub
Yuya Nishihara <yuya@tcha.org>
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diff changeset
213 return obj
28882
800ec7c048b0 pycompat: add util.urlerr util.urlreq classes for py3 compat
timeless <timeless@mozdev.org>
parents: 28835
diff changeset
214
29566
075146e85bb6 py3: conditionalize BaseHTTPServer, SimpleHTTPServer and CGIHTTPServer import
Pulkit Goyal <7895pulkit@gmail.com>
parents: 29455
diff changeset
215 httpserver = _pycompatstub()
28882
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timeless <timeless@mozdev.org>
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diff changeset
216 urlreq = _pycompatstub()
800ec7c048b0 pycompat: add util.urlerr util.urlreq classes for py3 compat
timeless <timeless@mozdev.org>
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diff changeset
217 urlerr = _pycompatstub()
30031
0f6d6fdd3c2a pycompat: provide 'ispy3' constant
Yuya Nishihara <yuya@tcha.org>
parents: 29812
diff changeset
218 if not ispy3:
29566
075146e85bb6 py3: conditionalize BaseHTTPServer, SimpleHTTPServer and CGIHTTPServer import
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parents: 29455
diff changeset
219 import BaseHTTPServer
075146e85bb6 py3: conditionalize BaseHTTPServer, SimpleHTTPServer and CGIHTTPServer import
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parents: 29455
diff changeset
220 import CGIHTTPServer
075146e85bb6 py3: conditionalize BaseHTTPServer, SimpleHTTPServer and CGIHTTPServer import
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parents: 29455
diff changeset
221 import SimpleHTTPServer
28882
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timeless <timeless@mozdev.org>
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diff changeset
222 import urllib2
800ec7c048b0 pycompat: add util.urlerr util.urlreq classes for py3 compat
timeless <timeless@mozdev.org>
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diff changeset
223 import urllib
29812
c63ab0524db7 pycompat: delay loading modules registered to stub
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parents: 29811
diff changeset
224 urlreq._registeraliases(urllib, (
28882
800ec7c048b0 pycompat: add util.urlerr util.urlreq classes for py3 compat
timeless <timeless@mozdev.org>
parents: 28835
diff changeset
225 "addclosehook",
800ec7c048b0 pycompat: add util.urlerr util.urlreq classes for py3 compat
timeless <timeless@mozdev.org>
parents: 28835
diff changeset
226 "addinfourl",
800ec7c048b0 pycompat: add util.urlerr util.urlreq classes for py3 compat
timeless <timeless@mozdev.org>
parents: 28835
diff changeset
227 "ftpwrapper",
800ec7c048b0 pycompat: add util.urlerr util.urlreq classes for py3 compat
timeless <timeless@mozdev.org>
parents: 28835
diff changeset
228 "pathname2url",
800ec7c048b0 pycompat: add util.urlerr util.urlreq classes for py3 compat
timeless <timeless@mozdev.org>
parents: 28835
diff changeset
229 "quote",
800ec7c048b0 pycompat: add util.urlerr util.urlreq classes for py3 compat
timeless <timeless@mozdev.org>
parents: 28835
diff changeset
230 "splitattr",
800ec7c048b0 pycompat: add util.urlerr util.urlreq classes for py3 compat
timeless <timeless@mozdev.org>
parents: 28835
diff changeset
231 "splitpasswd",
800ec7c048b0 pycompat: add util.urlerr util.urlreq classes for py3 compat
timeless <timeless@mozdev.org>
parents: 28835
diff changeset
232 "splitport",
800ec7c048b0 pycompat: add util.urlerr util.urlreq classes for py3 compat
timeless <timeless@mozdev.org>
parents: 28835
diff changeset
233 "splituser",
800ec7c048b0 pycompat: add util.urlerr util.urlreq classes for py3 compat
timeless <timeless@mozdev.org>
parents: 28835
diff changeset
234 "unquote",
800ec7c048b0 pycompat: add util.urlerr util.urlreq classes for py3 compat
timeless <timeless@mozdev.org>
parents: 28835
diff changeset
235 "url2pathname",
800ec7c048b0 pycompat: add util.urlerr util.urlreq classes for py3 compat
timeless <timeless@mozdev.org>
parents: 28835
diff changeset
236 "urlencode",
800ec7c048b0 pycompat: add util.urlerr util.urlreq classes for py3 compat
timeless <timeless@mozdev.org>
parents: 28835
diff changeset
237 ))
29812
c63ab0524db7 pycompat: delay loading modules registered to stub
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diff changeset
238 urlreq._registeraliases(urllib2, (
28882
800ec7c048b0 pycompat: add util.urlerr util.urlreq classes for py3 compat
timeless <timeless@mozdev.org>
parents: 28835
diff changeset
239 "AbstractHTTPHandler",
800ec7c048b0 pycompat: add util.urlerr util.urlreq classes for py3 compat
timeless <timeless@mozdev.org>
parents: 28835
diff changeset
240 "BaseHandler",
800ec7c048b0 pycompat: add util.urlerr util.urlreq classes for py3 compat
timeless <timeless@mozdev.org>
parents: 28835
diff changeset
241 "build_opener",
800ec7c048b0 pycompat: add util.urlerr util.urlreq classes for py3 compat
timeless <timeless@mozdev.org>
parents: 28835
diff changeset
242 "FileHandler",
800ec7c048b0 pycompat: add util.urlerr util.urlreq classes for py3 compat
timeless <timeless@mozdev.org>
parents: 28835
diff changeset
243 "FTPHandler",
800ec7c048b0 pycompat: add util.urlerr util.urlreq classes for py3 compat
timeless <timeless@mozdev.org>
parents: 28835
diff changeset
244 "HTTPBasicAuthHandler",
800ec7c048b0 pycompat: add util.urlerr util.urlreq classes for py3 compat
timeless <timeless@mozdev.org>
parents: 28835
diff changeset
245 "HTTPDigestAuthHandler",
800ec7c048b0 pycompat: add util.urlerr util.urlreq classes for py3 compat
timeless <timeless@mozdev.org>
parents: 28835
diff changeset
246 "HTTPHandler",
800ec7c048b0 pycompat: add util.urlerr util.urlreq classes for py3 compat
timeless <timeless@mozdev.org>
parents: 28835
diff changeset
247 "HTTPPasswordMgrWithDefaultRealm",
800ec7c048b0 pycompat: add util.urlerr util.urlreq classes for py3 compat
timeless <timeless@mozdev.org>
parents: 28835
diff changeset
248 "HTTPSHandler",
800ec7c048b0 pycompat: add util.urlerr util.urlreq classes for py3 compat
timeless <timeless@mozdev.org>
parents: 28835
diff changeset
249 "install_opener",
800ec7c048b0 pycompat: add util.urlerr util.urlreq classes for py3 compat
timeless <timeless@mozdev.org>
parents: 28835
diff changeset
250 "ProxyHandler",
800ec7c048b0 pycompat: add util.urlerr util.urlreq classes for py3 compat
timeless <timeless@mozdev.org>
parents: 28835
diff changeset
251 "Request",
800ec7c048b0 pycompat: add util.urlerr util.urlreq classes for py3 compat
timeless <timeless@mozdev.org>
parents: 28835
diff changeset
252 "urlopen",
800ec7c048b0 pycompat: add util.urlerr util.urlreq classes for py3 compat
timeless <timeless@mozdev.org>
parents: 28835
diff changeset
253 ))
29812
c63ab0524db7 pycompat: delay loading modules registered to stub
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diff changeset
254 urlerr._registeraliases(urllib2, (
28882
800ec7c048b0 pycompat: add util.urlerr util.urlreq classes for py3 compat
timeless <timeless@mozdev.org>
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255 "HTTPError",
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256 "URLError",
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257 ))
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258 httpserver._registeraliases(BaseHTTPServer, (
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259 "HTTPServer",
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260 "BaseHTTPRequestHandler",
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261 ))
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262 httpserver._registeraliases(SimpleHTTPServer, (
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263 "SimpleHTTPRequestHandler",
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264 ))
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265 httpserver._registeraliases(CGIHTTPServer, (
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266 "CGIHTTPRequestHandler",
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267 ))
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268
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269 else:
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270 import urllib.parse
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271 urlreq._registeraliases(urllib.parse, (
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272 "splitattr",
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273 "splitpasswd",
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274 "splitport",
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275 "splituser",
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276 "unquote",
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277 ))
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278 import urllib.request
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279 urlreq._registeraliases(urllib.request, (
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280 "AbstractHTTPHandler",
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281 "BaseHandler",
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282 "build_opener",
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283 "FileHandler",
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284 "FTPHandler",
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285 "ftpwrapper",
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286 "HTTPHandler",
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287 "HTTPSHandler",
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timeless <timeless@mozdev.org>
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288 "install_opener",
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timeless <timeless@mozdev.org>
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289 "pathname2url",
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290 "HTTPBasicAuthHandler",
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291 "HTTPDigestAuthHandler",
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292 "HTTPPasswordMgrWithDefaultRealm",
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293 "ProxyHandler",
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timeless <timeless@mozdev.org>
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294 "Request",
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295 "url2pathname",
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296 "urlopen",
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297 ))
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298 import urllib.response
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299 urlreq._registeraliases(urllib.response, (
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300 "addclosehook",
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301 "addinfourl",
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302 ))
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303 import urllib.error
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304 urlerr._registeraliases(urllib.error, (
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305 "HTTPError",
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306 "URLError",
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307 ))
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308 import http.server
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309 httpserver._registeraliases(http.server, (
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310 "HTTPServer",
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311 "BaseHTTPRequestHandler",
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312 "SimpleHTTPRequestHandler",
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313 "CGIHTTPRequestHandler",
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314 ))
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315
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316 # urllib.parse.quote() accepts both str and bytes, decodes bytes
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317 # (if necessary), and returns str. This is wonky. We provide a custom
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318 # implementation that only accepts bytes and emits bytes.
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319 def quote(s, safe=r'/'):
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320 s = urllib.parse.quote_from_bytes(s, safe=safe)
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321 return s.encode('ascii', 'strict')
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322
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323 urlreq.quote = quote