Mercurial > hg
annotate mercurial/pycompat.py @ 31595:e8bd005c0af7
debugfsinfo: use util.getfstype
This changes the behavior slightly. It now always prints fstype, regardless
of whether osutil.getfstype exists.
author | Jun Wu <quark@fb.com> |
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date | Thu, 23 Mar 2017 12:03:19 -0700 |
parents | 55c6788c54e2 |
children | 7d2cbe11ae48 |
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 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 xmlrpclib |
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26 else: |
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27 import http.client as httplib |
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28 import pickle |
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29 import queue as _queue |
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30 import socketserver |
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31 import xmlrpc.client as xmlrpclib |
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32 |
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33 if ispy3: |
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34 import builtins |
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35 import functools |
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36 import io |
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37 import struct |
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38 |
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39 fsencode = os.fsencode |
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40 fsdecode = os.fsdecode |
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41 # A bytes version of os.name. |
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42 osname = os.name.encode('ascii') |
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43 ospathsep = os.pathsep.encode('ascii') |
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44 ossep = os.sep.encode('ascii') |
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45 osaltsep = os.altsep |
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46 if osaltsep: |
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47 osaltsep = osaltsep.encode('ascii') |
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48 # os.getcwd() on Python 3 returns string, but it has os.getcwdb() which |
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49 # returns bytes. |
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50 getcwd = os.getcwdb |
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51 sysplatform = sys.platform.encode('ascii') |
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52 sysexecutable = sys.executable |
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53 if sysexecutable: |
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54 sysexecutable = os.fsencode(sysexecutable) |
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55 stringio = io.BytesIO |
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56 maplist = lambda *args: list(map(*args)) |
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57 |
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58 # TODO: .buffer might not exist if std streams were replaced; we'll need |
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59 # a silly wrapper to make a bytes stream backed by a unicode one. |
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60 stdin = sys.stdin.buffer |
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61 stdout = sys.stdout.buffer |
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62 stderr = sys.stderr.buffer |
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63 |
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64 # Since Python 3 converts argv to wchar_t type by Py_DecodeLocale() on Unix, |
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65 # we can use os.fsencode() to get back bytes argv. |
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66 # |
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67 # https://hg.python.org/cpython/file/v3.5.1/Programs/python.c#l55 |
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68 # |
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69 # TODO: On Windows, the native argv is wchar_t, so we'll need a different |
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70 # workaround to simulate the Python 2 (i.e. ANSI Win32 API) behavior. |
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71 if getattr(sys, 'argv', None) is not None: |
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72 sysargv = list(map(os.fsencode, sys.argv)) |
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73 |
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74 bytechr = struct.Struct('>B').pack |
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75 |
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76 class bytestr(bytes): |
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77 """A bytes which mostly acts as a Python 2 str |
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78 |
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79 >>> bytestr(), bytestr(bytearray(b'foo')), bytestr(u'ascii'), bytestr(1) |
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80 (b'', b'foo', b'ascii', b'1') |
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81 >>> s = bytestr(b'foo') |
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82 >>> assert s is bytestr(s) |
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83 |
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84 There's no implicit conversion from non-ascii str as its encoding is |
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85 unknown: |
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86 |
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87 >>> bytestr(chr(0x80)) # doctest: +ELLIPSIS |
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88 Traceback (most recent call last): |
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89 ... |
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90 UnicodeEncodeError: ... |
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91 |
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92 Comparison between bytestr and bytes should work: |
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93 |
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94 >>> assert bytestr(b'foo') == b'foo' |
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95 >>> assert b'foo' == bytestr(b'foo') |
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96 >>> assert b'f' in bytestr(b'foo') |
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97 >>> assert bytestr(b'f') in b'foo' |
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98 |
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99 Sliced elements should be bytes, not integer: |
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100 |
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101 >>> s[1], s[:2] |
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102 (b'o', b'fo') |
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103 >>> list(s), list(reversed(s)) |
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104 ([b'f', b'o', b'o'], [b'o', b'o', b'f']) |
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105 |
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106 As bytestr type isn't propagated across operations, you need to cast |
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107 bytes to bytestr explicitly: |
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108 |
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109 >>> s = bytestr(b'foo').upper() |
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110 >>> t = bytestr(s) |
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111 >>> s[0], t[0] |
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112 (70, b'F') |
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113 |
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114 Be careful to not pass a bytestr object to a function which expects |
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115 bytearray-like behavior. |
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116 |
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117 >>> t = bytes(t) # cast to bytes |
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118 >>> assert type(t) is bytes |
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119 """ |
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120 |
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121 def __new__(cls, s=b''): |
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122 if isinstance(s, bytestr): |
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123 return s |
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124 if not isinstance(s, (bytes, bytearray)): |
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125 s = str(s).encode(u'ascii') |
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126 return bytes.__new__(cls, s) |
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127 |
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128 def __getitem__(self, key): |
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129 s = bytes.__getitem__(self, key) |
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130 if not isinstance(s, bytes): |
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131 s = bytechr(s) |
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132 return s |
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133 |
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134 def __iter__(self): |
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135 return iterbytestr(bytes.__iter__(self)) |
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136 |
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137 def iterbytestr(s): |
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138 """Iterate bytes as if it were a str object of Python 2""" |
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139 return map(bytechr, s) |
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140 |
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141 def sysstr(s): |
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142 """Return a keyword str to be passed to Python functions such as |
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143 getattr() and str.encode() |
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144 |
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145 This never raises UnicodeDecodeError. Non-ascii characters are |
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146 considered invalid and mapped to arbitrary but unique code points |
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147 such that 'sysstr(a) != sysstr(b)' for all 'a != b'. |
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148 """ |
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149 if isinstance(s, builtins.str): |
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150 return s |
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151 return s.decode(u'latin-1') |
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152 |
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153 def _wrapattrfunc(f): |
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154 @functools.wraps(f) |
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155 def w(object, name, *args): |
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156 return f(object, sysstr(name), *args) |
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157 return w |
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158 |
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159 # these wrappers are automagically imported by hgloader |
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160 delattr = _wrapattrfunc(builtins.delattr) |
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161 getattr = _wrapattrfunc(builtins.getattr) |
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162 hasattr = _wrapattrfunc(builtins.hasattr) |
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163 setattr = _wrapattrfunc(builtins.setattr) |
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164 xrange = builtins.range |
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165 |
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166 def open(name, mode='r', buffering=-1): |
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167 return builtins.open(name, sysstr(mode), buffering) |
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168 |
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169 # getopt.getopt() on Python 3 deals with unicodes internally so we cannot |
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170 # pass bytes there. Passing unicodes will result in unicodes as return |
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171 # values which we need to convert again to bytes. |
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172 def getoptb(args, shortlist, namelist): |
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173 args = [a.decode('latin-1') for a in args] |
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174 shortlist = shortlist.decode('latin-1') |
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175 namelist = [a.decode('latin-1') for a in namelist] |
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176 opts, args = getopt.getopt(args, shortlist, namelist) |
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177 opts = [(a[0].encode('latin-1'), a[1].encode('latin-1')) |
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178 for a in opts] |
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179 args = [a.encode('latin-1') for a in args] |
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180 return opts, args |
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181 |
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182 # keys of keyword arguments in Python need to be strings which are unicodes |
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183 # Python 3. This function takes keyword arguments, convert the keys to str. |
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184 def strkwargs(dic): |
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185 dic = dict((k.decode('latin-1'), v) for k, v in dic.iteritems()) |
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186 return dic |
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187 |
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188 # keys of keyword arguments need to be unicode while passing into |
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189 # a function. This function helps us to convert those keys back to bytes |
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190 # again as we need to deal with bytes. |
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191 def byteskwargs(dic): |
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192 dic = dict((k.encode('latin-1'), v) for k, v in dic.iteritems()) |
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193 return dic |
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194 |
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195 # shlex.split() accepts unicodes on Python 3. This function takes bytes |
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196 # argument, convert it into unicodes, pass into shlex.split(), convert the |
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197 # returned value to bytes and return that. |
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198 # TODO: handle shlex.shlex(). |
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199 def shlexsplit(s): |
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200 ret = shlex.split(s.decode('latin-1')) |
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201 return [a.encode('latin-1') for a in ret] |
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202 |
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203 else: |
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204 import cStringIO |
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205 |
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206 bytechr = chr |
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207 bytestr = str |
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208 iterbytestr = iter |
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209 |
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210 def sysstr(s): |
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211 return s |
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212 |
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213 # Partial backport from os.py in Python 3, which only accepts bytes. |
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214 # In Python 2, our paths should only ever be bytes, a unicode path |
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215 # indicates a bug. |
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216 def fsencode(filename): |
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217 if isinstance(filename, str): |
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218 return filename |
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219 else: |
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220 raise TypeError( |
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221 "expect str, not %s" % type(filename).__name__) |
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222 |
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223 # In Python 2, fsdecode() has a very chance to receive bytes. So it's |
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224 # better not to touch Python 2 part as it's already working fine. |
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225 def fsdecode(filename): |
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226 return filename |
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227 |
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228 def getoptb(args, shortlist, namelist): |
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229 return getopt.getopt(args, shortlist, namelist) |
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230 |
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231 def strkwargs(dic): |
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232 return dic |
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233 |
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234 def byteskwargs(dic): |
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235 return dic |
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236 |
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237 osname = os.name |
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238 ospathsep = os.pathsep |
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239 ossep = os.sep |
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240 osaltsep = os.altsep |
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241 stdin = sys.stdin |
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242 stdout = sys.stdout |
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243 stderr = sys.stderr |
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244 if getattr(sys, 'argv', None) is not None: |
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245 sysargv = sys.argv |
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246 sysplatform = sys.platform |
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247 getcwd = os.getcwd |
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248 sysexecutable = sys.executable |
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249 shlexsplit = shlex.split |
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250 stringio = cStringIO.StringIO |
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251 maplist = map |
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252 |
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253 empty = _queue.Empty |
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254 queue = _queue.Queue |
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255 |
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256 class _pycompatstub(object): |
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257 def __init__(self): |
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258 self._aliases = {} |
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259 |
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260 def _registeraliases(self, origin, items): |
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261 """Add items that will be populated at the first access""" |
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262 items = map(sysstr, items) |
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263 self._aliases.update( |
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264 (item.replace(sysstr('_'), sysstr('')).lower(), (origin, item)) |
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265 for item in items) |
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266 |
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267 def _registeralias(self, origin, attr, name): |
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268 """Alias ``origin``.``attr`` as ``name``""" |
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269 self._aliases[sysstr(name)] = (origin, sysstr(attr)) |
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270 |
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271 def __getattr__(self, name): |
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272 try: |
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273 origin, item = self._aliases[name] |
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274 except KeyError: |
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275 raise AttributeError(name) |
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276 self.__dict__[name] = obj = getattr(origin, item) |
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277 return obj |
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278 |
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279 httpserver = _pycompatstub() |
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280 urlreq = _pycompatstub() |
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281 urlerr = _pycompatstub() |
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282 if not ispy3: |
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283 import BaseHTTPServer |
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284 import CGIHTTPServer |
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285 import SimpleHTTPServer |
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286 import urllib2 |
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287 import urllib |
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288 import urlparse |
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289 urlreq._registeraliases(urllib, ( |
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290 "addclosehook", |
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291 "addinfourl", |
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292 "ftpwrapper", |
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293 "pathname2url", |
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294 "quote", |
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295 "splitattr", |
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296 "splitpasswd", |
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297 "splitport", |
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298 "splituser", |
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299 "unquote", |
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300 "url2pathname", |
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301 "urlencode", |
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302 )) |
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303 urlreq._registeraliases(urllib2, ( |
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304 "AbstractHTTPHandler", |
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305 "BaseHandler", |
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306 "build_opener", |
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307 "FileHandler", |
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308 "FTPHandler", |
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309 "HTTPBasicAuthHandler", |
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310 "HTTPDigestAuthHandler", |
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311 "HTTPHandler", |
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312 "HTTPPasswordMgrWithDefaultRealm", |
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313 "HTTPSHandler", |
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314 "install_opener", |
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315 "ProxyHandler", |
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316 "Request", |
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317 "urlopen", |
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318 )) |
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319 urlreq._registeraliases(urlparse, ( |
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320 "urlparse", |
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321 "urlunparse", |
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322 )) |
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323 urlerr._registeraliases(urllib2, ( |
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324 "HTTPError", |
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325 "URLError", |
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326 )) |
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327 httpserver._registeraliases(BaseHTTPServer, ( |
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328 "HTTPServer", |
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329 "BaseHTTPRequestHandler", |
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330 )) |
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331 httpserver._registeraliases(SimpleHTTPServer, ( |
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332 "SimpleHTTPRequestHandler", |
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333 )) |
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334 httpserver._registeraliases(CGIHTTPServer, ( |
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335 "CGIHTTPRequestHandler", |
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336 )) |
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337 |
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338 else: |
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339 import urllib.parse |
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340 urlreq._registeraliases(urllib.parse, ( |
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341 "splitattr", |
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342 "splitpasswd", |
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343 "splitport", |
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344 "splituser", |
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345 "urlparse", |
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346 "urlunparse", |
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347 )) |
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348 urlreq._registeralias(urllib.parse, "unquote_to_bytes", "unquote") |
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349 import urllib.request |
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350 urlreq._registeraliases(urllib.request, ( |
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351 "AbstractHTTPHandler", |
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352 "BaseHandler", |
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353 "build_opener", |
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354 "FileHandler", |
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355 "FTPHandler", |
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356 "ftpwrapper", |
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357 "HTTPHandler", |
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358 "HTTPSHandler", |
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359 "install_opener", |
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360 "pathname2url", |
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361 "HTTPBasicAuthHandler", |
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362 "HTTPDigestAuthHandler", |
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363 "HTTPPasswordMgrWithDefaultRealm", |
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364 "ProxyHandler", |
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365 "Request", |
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366 "url2pathname", |
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367 "urlopen", |
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368 )) |
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369 import urllib.response |
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370 urlreq._registeraliases(urllib.response, ( |
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371 "addclosehook", |
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372 "addinfourl", |
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373 )) |
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374 import urllib.error |
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375 urlerr._registeraliases(urllib.error, ( |
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376 "HTTPError", |
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377 "URLError", |
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378 )) |
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379 import http.server |
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380 httpserver._registeraliases(http.server, ( |
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381 "HTTPServer", |
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382 "BaseHTTPRequestHandler", |
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383 "SimpleHTTPRequestHandler", |
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384 "CGIHTTPRequestHandler", |
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385 )) |
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386 |
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387 # urllib.parse.quote() accepts both str and bytes, decodes bytes |
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388 # (if necessary), and returns str. This is wonky. We provide a custom |
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389 # implementation that only accepts bytes and emits bytes. |
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390 def quote(s, safe=r'/'): |
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391 s = urllib.parse.quote_from_bytes(s, safe=safe) |
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392 return s.encode('ascii', 'strict') |
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393 |
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394 urlreq.quote = quote |