Mercurial > hg
annotate mercurial/pycompat.py @ 38263:dbf31732ef64
debugwalk: pretty-print nested matcher
While porting filesets to composition of matchers, I found the original
one-liner was hard to read.
author | Yuya Nishihara <yuya@tcha.org> |
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date | Sun, 10 Jun 2018 11:55:52 +0900 |
parents | cc9aa88792fe |
children | 79dd61a4554f |
rev | line source |
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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 inspect |
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15 import os |
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16 import shlex |
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17 import sys |
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18 import tempfile |
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19 |
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20 ispy3 = (sys.version_info[0] >= 3) |
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21 ispypy = (r'__pypy__' in sys.builtin_module_names) |
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22 |
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23 if not ispy3: |
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24 import cookielib |
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25 import cPickle as pickle |
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26 import httplib |
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27 import Queue as queue |
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28 import SocketServer as socketserver |
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29 import xmlrpclib |
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30 |
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31 from .thirdparty.concurrent import futures |
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32 |
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33 def future_set_exception_info(f, exc_info): |
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34 f.set_exception_info(*exc_info) |
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35 else: |
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36 import concurrent.futures as futures |
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37 import http.cookiejar as cookielib |
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38 import http.client as httplib |
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39 import pickle |
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40 import queue as queue |
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41 import socketserver |
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42 import xmlrpc.client as xmlrpclib |
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43 |
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44 def future_set_exception_info(f, exc_info): |
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45 f.set_exception(exc_info[0]) |
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46 |
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47 def identity(a): |
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48 return a |
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49 |
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50 if ispy3: |
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51 import builtins |
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52 import functools |
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53 import io |
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54 import struct |
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55 |
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56 fsencode = os.fsencode |
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57 fsdecode = os.fsdecode |
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58 oscurdir = os.curdir.encode('ascii') |
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59 oslinesep = os.linesep.encode('ascii') |
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60 osname = os.name.encode('ascii') |
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61 ospathsep = os.pathsep.encode('ascii') |
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62 ospardir = os.pardir.encode('ascii') |
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63 ossep = os.sep.encode('ascii') |
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64 osaltsep = os.altsep |
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65 if osaltsep: |
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66 osaltsep = osaltsep.encode('ascii') |
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67 # os.getcwd() on Python 3 returns string, but it has os.getcwdb() which |
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68 # returns bytes. |
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69 getcwd = os.getcwdb |
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70 sysplatform = sys.platform.encode('ascii') |
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71 sysexecutable = sys.executable |
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72 if sysexecutable: |
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73 sysexecutable = os.fsencode(sysexecutable) |
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74 bytesio = io.BytesIO |
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75 # TODO deprecate stringio name, as it is a lie on Python 3. |
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76 stringio = bytesio |
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77 |
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78 def maplist(*args): |
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79 return list(map(*args)) |
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80 |
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81 def rangelist(*args): |
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82 return list(range(*args)) |
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83 |
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84 def ziplist(*args): |
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85 return list(zip(*args)) |
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86 |
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87 rawinput = input |
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88 getargspec = inspect.getfullargspec |
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89 |
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90 # TODO: .buffer might not exist if std streams were replaced; we'll need |
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91 # a silly wrapper to make a bytes stream backed by a unicode one. |
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92 stdin = sys.stdin.buffer |
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93 stdout = sys.stdout.buffer |
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94 stderr = sys.stderr.buffer |
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95 |
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96 # Since Python 3 converts argv to wchar_t type by Py_DecodeLocale() on Unix, |
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97 # we can use os.fsencode() to get back bytes argv. |
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98 # |
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99 # https://hg.python.org/cpython/file/v3.5.1/Programs/python.c#l55 |
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100 # |
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101 # TODO: On Windows, the native argv is wchar_t, so we'll need a different |
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102 # workaround to simulate the Python 2 (i.e. ANSI Win32 API) behavior. |
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103 if getattr(sys, 'argv', None) is not None: |
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104 sysargv = list(map(os.fsencode, sys.argv)) |
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105 |
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106 bytechr = struct.Struct('>B').pack |
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107 byterepr = b'%r'.__mod__ |
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108 |
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109 class bytestr(bytes): |
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110 """A bytes which mostly acts as a Python 2 str |
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111 |
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112 >>> bytestr(), bytestr(bytearray(b'foo')), bytestr(u'ascii'), bytestr(1) |
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113 ('', 'foo', 'ascii', '1') |
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114 >>> s = bytestr(b'foo') |
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115 >>> assert s is bytestr(s) |
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116 |
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117 __bytes__() should be called if provided: |
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118 |
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119 >>> class bytesable(object): |
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120 ... def __bytes__(self): |
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121 ... return b'bytes' |
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122 >>> bytestr(bytesable()) |
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123 'bytes' |
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124 |
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125 There's no implicit conversion from non-ascii str as its encoding is |
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126 unknown: |
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127 |
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128 >>> bytestr(chr(0x80)) # doctest: +ELLIPSIS |
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129 Traceback (most recent call last): |
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130 ... |
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131 UnicodeEncodeError: ... |
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132 |
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133 Comparison between bytestr and bytes should work: |
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134 |
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135 >>> assert bytestr(b'foo') == b'foo' |
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136 >>> assert b'foo' == bytestr(b'foo') |
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137 >>> assert b'f' in bytestr(b'foo') |
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138 >>> assert bytestr(b'f') in b'foo' |
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139 |
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140 Sliced elements should be bytes, not integer: |
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141 |
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142 >>> s[1], s[:2] |
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143 (b'o', b'fo') |
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144 >>> list(s), list(reversed(s)) |
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145 ([b'f', b'o', b'o'], [b'o', b'o', b'f']) |
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146 |
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147 As bytestr type isn't propagated across operations, you need to cast |
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148 bytes to bytestr explicitly: |
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149 |
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150 >>> s = bytestr(b'foo').upper() |
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151 >>> t = bytestr(s) |
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152 >>> s[0], t[0] |
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153 (70, b'F') |
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154 |
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155 Be careful to not pass a bytestr object to a function which expects |
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156 bytearray-like behavior. |
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157 |
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158 >>> t = bytes(t) # cast to bytes |
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159 >>> assert type(t) is bytes |
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160 """ |
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161 |
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162 def __new__(cls, s=b''): |
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163 if isinstance(s, bytestr): |
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164 return s |
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165 if (not isinstance(s, (bytes, bytearray)) |
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166 and not hasattr(s, u'__bytes__')): # hasattr-py3-only |
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167 s = str(s).encode(u'ascii') |
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168 return bytes.__new__(cls, s) |
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169 |
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170 def __getitem__(self, key): |
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171 s = bytes.__getitem__(self, key) |
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172 if not isinstance(s, bytes): |
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173 s = bytechr(s) |
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174 return s |
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175 |
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176 def __iter__(self): |
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177 return iterbytestr(bytes.__iter__(self)) |
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178 |
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179 def __repr__(self): |
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180 return bytes.__repr__(self)[1:] # drop b'' |
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181 |
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182 def iterbytestr(s): |
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183 """Iterate bytes as if it were a str object of Python 2""" |
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184 return map(bytechr, s) |
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185 |
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186 def maybebytestr(s): |
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187 """Promote bytes to bytestr""" |
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188 if isinstance(s, bytes): |
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189 return bytestr(s) |
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190 return s |
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191 |
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192 def sysbytes(s): |
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193 """Convert an internal str (e.g. keyword, __doc__) back to bytes |
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194 |
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195 This never raises UnicodeEncodeError, but only ASCII characters |
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196 can be round-trip by sysstr(sysbytes(s)). |
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197 """ |
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198 return s.encode(u'utf-8') |
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199 |
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200 def sysstr(s): |
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201 """Return a keyword str to be passed to Python functions such as |
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202 getattr() and str.encode() |
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203 |
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204 This never raises UnicodeDecodeError. Non-ascii characters are |
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205 considered invalid and mapped to arbitrary but unique code points |
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206 such that 'sysstr(a) != sysstr(b)' for all 'a != b'. |
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207 """ |
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208 if isinstance(s, builtins.str): |
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209 return s |
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210 return s.decode(u'latin-1') |
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211 |
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212 def strurl(url): |
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213 """Converts a bytes url back to str""" |
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214 if isinstance(url, bytes): |
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215 return url.decode(u'ascii') |
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216 return url |
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217 |
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218 def bytesurl(url): |
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219 """Converts a str url to bytes by encoding in ascii""" |
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220 if isinstance(url, str): |
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221 return url.encode(u'ascii') |
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222 return url |
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223 |
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224 def raisewithtb(exc, tb): |
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225 """Raise exception with the given traceback""" |
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226 raise exc.with_traceback(tb) |
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227 |
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228 def getdoc(obj): |
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229 """Get docstring as bytes; may be None so gettext() won't confuse it |
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230 with _('')""" |
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231 doc = getattr(obj, u'__doc__', None) |
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232 if doc is None: |
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233 return doc |
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234 return sysbytes(doc) |
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235 |
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236 def _wrapattrfunc(f): |
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237 @functools.wraps(f) |
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238 def w(object, name, *args): |
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239 return f(object, sysstr(name), *args) |
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240 return w |
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241 |
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242 # these wrappers are automagically imported by hgloader |
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243 delattr = _wrapattrfunc(builtins.delattr) |
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244 getattr = _wrapattrfunc(builtins.getattr) |
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245 hasattr = _wrapattrfunc(builtins.hasattr) |
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246 setattr = _wrapattrfunc(builtins.setattr) |
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247 xrange = builtins.range |
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248 unicode = str |
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249 |
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250 def open(name, mode='r', buffering=-1, encoding=None): |
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251 return builtins.open(name, sysstr(mode), buffering, encoding) |
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252 |
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253 safehasattr = _wrapattrfunc(builtins.hasattr) |
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254 |
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255 def _getoptbwrapper(orig, args, shortlist, namelist): |
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256 """ |
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257 Takes bytes arguments, converts them to unicode, pass them to |
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258 getopt.getopt(), convert the returned values back to bytes and then |
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259 return them for Python 3 compatibility as getopt.getopt() don't accepts |
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260 bytes on Python 3. |
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261 """ |
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262 args = [a.decode('latin-1') for a in args] |
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263 shortlist = shortlist.decode('latin-1') |
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264 namelist = [a.decode('latin-1') for a in namelist] |
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265 opts, args = orig(args, shortlist, namelist) |
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266 opts = [(a[0].encode('latin-1'), a[1].encode('latin-1')) |
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267 for a in opts] |
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268 args = [a.encode('latin-1') for a in args] |
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269 return opts, args |
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270 |
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271 def strkwargs(dic): |
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272 """ |
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273 Converts the keys of a python dictonary to str i.e. unicodes so that |
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274 they can be passed as keyword arguments as dictonaries with bytes keys |
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275 can't be passed as keyword arguments to functions on Python 3. |
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276 """ |
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277 dic = dict((k.decode('latin-1'), v) for k, v in dic.iteritems()) |
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278 return dic |
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279 |
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280 def byteskwargs(dic): |
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281 """ |
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282 Converts keys of python dictonaries to bytes as they were converted to |
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283 str to pass that dictonary as a keyword argument on Python 3. |
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284 """ |
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285 dic = dict((k.encode('latin-1'), v) for k, v in dic.iteritems()) |
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286 return dic |
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287 |
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288 # TODO: handle shlex.shlex(). |
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289 def shlexsplit(s, comments=False, posix=True): |
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290 """ |
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291 Takes bytes argument, convert it to str i.e. unicodes, pass that into |
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292 shlex.split(), convert the returned value to bytes and return that for |
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293 Python 3 compatibility as shelx.split() don't accept bytes on Python 3. |
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294 """ |
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295 ret = shlex.split(s.decode('latin-1'), comments, posix) |
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296 return [a.encode('latin-1') for a in ret] |
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297 |
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298 def emailparser(*args, **kwargs): |
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299 import email.parser |
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300 return email.parser.BytesParser(*args, **kwargs) |
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301 |
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302 else: |
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303 import cStringIO |
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304 |
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305 bytechr = chr |
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306 byterepr = repr |
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307 bytestr = str |
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308 iterbytestr = iter |
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309 maybebytestr = identity |
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310 sysbytes = identity |
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311 sysstr = identity |
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312 strurl = identity |
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313 bytesurl = identity |
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314 |
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315 # this can't be parsed on Python 3 |
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316 exec('def raisewithtb(exc, tb):\n' |
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317 ' raise exc, None, tb\n') |
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318 |
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319 def fsencode(filename): |
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320 """ |
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321 Partial backport from os.py in Python 3, which only accepts bytes. |
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322 In Python 2, our paths should only ever be bytes, a unicode path |
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323 indicates a bug. |
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324 """ |
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325 if isinstance(filename, str): |
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326 return filename |
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327 else: |
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328 raise TypeError( |
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329 "expect str, not %s" % type(filename).__name__) |
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330 |
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331 # In Python 2, fsdecode() has a very chance to receive bytes. So it's |
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332 # better not to touch Python 2 part as it's already working fine. |
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333 fsdecode = identity |
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334 |
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335 def getdoc(obj): |
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336 return getattr(obj, '__doc__', None) |
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337 |
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338 _notset = object() |
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339 |
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340 def safehasattr(thing, attr): |
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341 return getattr(thing, attr, _notset) is not _notset |
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342 |
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343 def _getoptbwrapper(orig, args, shortlist, namelist): |
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344 return orig(args, shortlist, namelist) |
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345 |
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346 strkwargs = identity |
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347 byteskwargs = identity |
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348 |
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349 oscurdir = os.curdir |
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350 oslinesep = os.linesep |
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351 osname = os.name |
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352 ospathsep = os.pathsep |
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353 ospardir = os.pardir |
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354 ossep = os.sep |
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355 osaltsep = os.altsep |
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356 stdin = sys.stdin |
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357 stdout = sys.stdout |
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358 stderr = sys.stderr |
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359 if getattr(sys, 'argv', None) is not None: |
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360 sysargv = sys.argv |
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361 sysplatform = sys.platform |
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362 getcwd = os.getcwd |
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363 sysexecutable = sys.executable |
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364 shlexsplit = shlex.split |
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365 bytesio = cStringIO.StringIO |
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366 stringio = bytesio |
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367 maplist = map |
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368 rangelist = range |
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369 ziplist = zip |
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370 rawinput = raw_input |
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371 getargspec = inspect.getargspec |
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372 |
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373 def emailparser(*args, **kwargs): |
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374 import email.parser |
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375 return email.parser.Parser(*args, **kwargs) |
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376 |
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377 isjython = sysplatform.startswith('java') |
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378 |
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379 isdarwin = sysplatform == 'darwin' |
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380 isposix = osname == 'posix' |
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381 iswindows = osname == 'nt' |
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382 |
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383 def getoptb(args, shortlist, namelist): |
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384 return _getoptbwrapper(getopt.getopt, args, shortlist, namelist) |
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385 |
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386 def gnugetoptb(args, shortlist, namelist): |
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387 return _getoptbwrapper(getopt.gnu_getopt, args, shortlist, namelist) |
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388 |
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389 def mkdtemp(suffix=b'', prefix=b'tmp', dir=None): |
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390 return tempfile.mkdtemp(suffix, prefix, dir) |
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391 |
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392 # text=True is not supported; use util.from/tonativeeol() instead |
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393 def mkstemp(suffix=b'', prefix=b'tmp', dir=None): |
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394 return tempfile.mkstemp(suffix, prefix, dir) |
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395 |
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396 # mode must include 'b'ytes as encoding= is not supported |
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397 def namedtempfile(mode=b'w+b', bufsize=-1, suffix=b'', prefix=b'tmp', dir=None, |
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398 delete=True): |
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399 mode = sysstr(mode) |
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400 assert r'b' in mode |
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401 return tempfile.NamedTemporaryFile(mode, bufsize, suffix=suffix, |
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402 prefix=prefix, dir=dir, delete=delete) |