Mercurial > hg
annotate mercurial/pycompat.py @ 30212:260af19891f2
changegroup: increase write buffer size to 128k
By default, Python defers to the operating system for choosing the
default buffer size on opened files. On my Linux machine, the default
is 4k, which is really small for 2016.
This patch bumps the write buffer size when writing
changegroups/bundles to 128k. This matches the 128k read buffer
we already use on revlogs.
It's worth noting that this only impacts when writing to an explicit
file (such as during `hg bundle`). Buffers when writing to bundle
files via the repo vfs or to a temporary file are not impacted.
When producing a none-v2 bundle file of the mozilla-unified repository,
this change caused the number of write() system calls to drop from
952,449 to 29,788. After this change, the most frequent system
calls are fstat(), read(), lseek(), and open(). There were
2,523,672 system calls after this patch (so a net decrease of
~950k is statistically significant).
This change shows no performance change on my system. But I have a
high-end system with a fast SSD. It is quite possible this change
will have a significant impact on network file systems, where
extra network round trips due to excessive I/O system calls could
introduce significant latency.
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Sun, 16 Oct 2016 13:35:23 -0700 |
parents | f6dcda7505f9 |
children | 42af0590f4b9 |
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28818
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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 sys |
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14 |
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15 ispy3 = (sys.version_info[0] >= 3) |
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16 |
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17 if not ispy3: |
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18 import cPickle as pickle |
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19 import cStringIO as io |
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20 import httplib |
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21 import Queue as _queue |
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22 import SocketServer as socketserver |
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23 import urlparse |
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24 import xmlrpclib |
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25 else: |
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26 import http.client as httplib |
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27 import io |
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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 urllib.parse as urlparse |
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32 import xmlrpc.client as xmlrpclib |
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33 |
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34 if ispy3: |
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35 import builtins |
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36 import functools |
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37 import os |
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38 fsencode = os.fsencode |
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39 |
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40 def sysstr(s): |
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41 """Return a keyword str to be passed to Python functions such as |
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42 getattr() and str.encode() |
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43 |
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44 This never raises UnicodeDecodeError. Non-ascii characters are |
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45 considered invalid and mapped to arbitrary but unique code points |
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46 such that 'sysstr(a) != sysstr(b)' for all 'a != b'. |
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47 """ |
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48 if isinstance(s, builtins.str): |
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49 return s |
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50 return s.decode(u'latin-1') |
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51 |
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52 def _wrapattrfunc(f): |
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53 @functools.wraps(f) |
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54 def w(object, name, *args): |
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55 return f(object, sysstr(name), *args) |
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56 return w |
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57 |
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58 # these wrappers are automagically imported by hgloader |
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59 delattr = _wrapattrfunc(builtins.delattr) |
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60 getattr = _wrapattrfunc(builtins.getattr) |
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61 hasattr = _wrapattrfunc(builtins.hasattr) |
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62 setattr = _wrapattrfunc(builtins.setattr) |
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63 xrange = builtins.range |
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64 |
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65 else: |
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66 def sysstr(s): |
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67 return s |
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68 |
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69 # Partial backport from os.py in Python 3, which only accepts bytes. |
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70 # In Python 2, our paths should only ever be bytes, a unicode path |
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71 # indicates a bug. |
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72 def fsencode(filename): |
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73 if isinstance(filename, str): |
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74 return filename |
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75 else: |
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76 raise TypeError( |
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77 "expect str, not %s" % type(filename).__name__) |
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78 |
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79 stringio = io.StringIO |
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80 empty = _queue.Empty |
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81 queue = _queue.Queue |
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82 |
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83 class _pycompatstub(object): |
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84 def __init__(self): |
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85 self._aliases = {} |
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86 |
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87 def _registeraliases(self, origin, items): |
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88 """Add items that will be populated at the first access""" |
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89 items = map(sysstr, items) |
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90 self._aliases.update( |
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91 (item.replace(sysstr('_'), sysstr('')).lower(), (origin, item)) |
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92 for item in items) |
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93 |
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94 def __getattr__(self, name): |
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95 try: |
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96 origin, item = self._aliases[name] |
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97 except KeyError: |
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98 raise AttributeError(name) |
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99 self.__dict__[name] = obj = getattr(origin, item) |
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100 return obj |
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101 |
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102 httpserver = _pycompatstub() |
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103 urlreq = _pycompatstub() |
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104 urlerr = _pycompatstub() |
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105 if not ispy3: |
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106 import BaseHTTPServer |
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107 import CGIHTTPServer |
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108 import SimpleHTTPServer |
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109 import urllib2 |
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110 import urllib |
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111 urlreq._registeraliases(urllib, ( |
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112 "addclosehook", |
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113 "addinfourl", |
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114 "ftpwrapper", |
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115 "pathname2url", |
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116 "quote", |
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117 "splitattr", |
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118 "splitpasswd", |
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119 "splitport", |
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120 "splituser", |
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121 "unquote", |
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122 "url2pathname", |
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123 "urlencode", |
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124 )) |
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125 urlreq._registeraliases(urllib2, ( |
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126 "AbstractHTTPHandler", |
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127 "BaseHandler", |
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128 "build_opener", |
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129 "FileHandler", |
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130 "FTPHandler", |
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131 "HTTPBasicAuthHandler", |
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132 "HTTPDigestAuthHandler", |
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133 "HTTPHandler", |
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134 "HTTPPasswordMgrWithDefaultRealm", |
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135 "HTTPSHandler", |
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136 "install_opener", |
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137 "ProxyHandler", |
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138 "Request", |
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139 "urlopen", |
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140 )) |
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141 urlerr._registeraliases(urllib2, ( |
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142 "HTTPError", |
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143 "URLError", |
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144 )) |
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145 httpserver._registeraliases(BaseHTTPServer, ( |
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146 "HTTPServer", |
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147 "BaseHTTPRequestHandler", |
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148 )) |
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149 httpserver._registeraliases(SimpleHTTPServer, ( |
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150 "SimpleHTTPRequestHandler", |
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151 )) |
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152 httpserver._registeraliases(CGIHTTPServer, ( |
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153 "CGIHTTPRequestHandler", |
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154 )) |
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155 |
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156 else: |
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157 import urllib.request |
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158 urlreq._registeraliases(urllib.request, ( |
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159 "AbstractHTTPHandler", |
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160 "addclosehook", |
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161 "addinfourl", |
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162 "BaseHandler", |
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163 "build_opener", |
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164 "FileHandler", |
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165 "FTPHandler", |
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166 "ftpwrapper", |
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167 "HTTPHandler", |
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168 "HTTPSHandler", |
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169 "install_opener", |
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170 "pathname2url", |
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171 "HTTPBasicAuthHandler", |
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172 "HTTPDigestAuthHandler", |
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173 "HTTPPasswordMgrWithDefaultRealm", |
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174 "ProxyHandler", |
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175 "quote", |
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176 "Request", |
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177 "splitattr", |
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178 "splitpasswd", |
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179 "splitport", |
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180 "splituser", |
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181 "unquote", |
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182 "url2pathname", |
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183 "urlopen", |
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184 )) |
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185 import urllib.error |
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186 urlerr._registeraliases(urllib.error, ( |
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187 "HTTPError", |
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188 "URLError", |
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189 )) |
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190 import http.server |
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191 httpserver._registeraliases(http.server, ( |
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192 "HTTPServer", |
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193 "BaseHTTPRequestHandler", |
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194 "SimpleHTTPRequestHandler", |
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195 "CGIHTTPRequestHandler", |
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196 )) |