Mercurial > cpython-lru_cache-weakref

annotate Lib/uu.py @ 80661:94de77bd0b4b 2.7

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Issue #16194: document imp.load_dynamic problems when read several extension modules from the same binary object file.
author Andrew Svetlov <andrew.svetlov@gmail.com>
date Thu, 29 Nov 2012 19:51:28 +0200
parents 140d471b061a
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #! /usr/bin/env python
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2
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3 # Copyright 1994 by Lance Ellinghouse
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4 # Cathedral City, California Republic, United States of America.
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5 # All Rights Reserved
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6 # Permission to use, copy, modify, and distribute this software and its
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7 # documentation for any purpose and without fee is hereby granted,
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8 # provided that the above copyright notice appear in all copies and that
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9 # both that copyright notice and this permission notice appear in
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10 # supporting documentation, and that the name of Lance Ellinghouse
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11 # not be used in advertising or publicity pertaining to distribution
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12 # of the software without specific, written prior permission.
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13 # LANCE ELLINGHOUSE DISCLAIMS ALL WARRANTIES WITH REGARD TO
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14 # THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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15 # FITNESS, IN NO EVENT SHALL LANCE ELLINGHOUSE CENTRUM BE LIABLE
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16 # FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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17 # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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18 # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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19 # OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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20 #
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21 # Modified by Jack Jansen, CWI, July 1995:
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22 # - Use binascii module to do the actual line-by-line conversion
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23 # between ascii and binary. This results in a 1000-fold speedup. The C
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24 # version is still 5 times faster, though.
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25 # - Arguments more compliant with python standard
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26
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27 """Implementation of the UUencode and UUdecode functions.
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28
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29 encode(in_file, out_file [,name, mode])
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30 decode(in_file [, out_file, mode])
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31 """
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32
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33 import binascii
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34 import os
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35 import sys
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36
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37 __all__ = ["Error", "encode", "decode"]
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38
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39 class Error(Exception):
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40 pass
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41
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42 def encode(in_file, out_file, name=None, mode=None):
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43 """Uuencode file"""
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44 #
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45 # If in_file is a pathname open it and change defaults
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46 #
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47 opened_files = []
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48 try:
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49 if in_file == '-':
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50 in_file = sys.stdin
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51 elif isinstance(in_file, basestring):
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52 if name is None:
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53 name = os.path.basename(in_file)
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54 if mode is None:
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55 try:
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56 mode = os.stat(in_file).st_mode
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57 except AttributeError:
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58 pass
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59 in_file = open(in_file, 'rb')
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60 opened_files.append(in_file)
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61 #
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62 # Open out_file if it is a pathname
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63 #
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64 if out_file == '-':
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65 out_file = sys.stdout
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66 elif isinstance(out_file, basestring):
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67 out_file = open(out_file, 'wb')
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68 opened_files.append(out_file)
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69 #
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70 # Set defaults for name and mode
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71 #
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72 if name is None:
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73 name = '-'
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74 if mode is None:
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75 mode = 0666
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76 #
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77 # Write the data
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78 #
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79 out_file.write('begin %o %s\n' % ((mode&0777),name))
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80 data = in_file.read(45)
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81 while len(data) > 0:
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82 out_file.write(binascii.b2a_uu(data))
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83 data = in_file.read(45)
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84 out_file.write(' \nend\n')
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85 finally:
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86 for f in opened_files:
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87 f.close()
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88
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89
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90 def decode(in_file, out_file=None, mode=None, quiet=0):
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91 """Decode uuencoded file"""
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92 #
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93 # Open the input file, if needed.
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94 #
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95 opened_files = []
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96 if in_file == '-':
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97 in_file = sys.stdin
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98 elif isinstance(in_file, basestring):
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99 in_file = open(in_file)
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100 opened_files.append(in_file)
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101 try:
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102 #
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103 # Read until a begin is encountered or we've exhausted the file
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104 #
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105 while True:
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106 hdr = in_file.readline()
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107 if not hdr:
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108 raise Error('No valid begin line found in input file')
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109 if not hdr.startswith('begin'):
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110 continue
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111 hdrfields = hdr.split(' ', 2)
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112 if len(hdrfields) == 3 and hdrfields[0] == 'begin':
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113 try:
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114 int(hdrfields[1], 8)
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115 break
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116 except ValueError:
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117 pass
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118 if out_file is None:
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119 out_file = hdrfields[2].rstrip()
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120 if os.path.exists(out_file):
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121 raise Error('Cannot overwrite existing file: %s' % out_file)
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122 if mode is None:
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123 mode = int(hdrfields[1], 8)
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124 #
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125 # Open the output file
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126 #
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127 if out_file == '-':
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128 out_file = sys.stdout
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129 elif isinstance(out_file, basestring):
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130 fp = open(out_file, 'wb')
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131 try:
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132 os.path.chmod(out_file, mode)
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133 except AttributeError:
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134 pass
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135 out_file = fp
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136 opened_files.append(out_file)
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137 #
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138 # Main decoding loop
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139 #
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140 s = in_file.readline()
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141 while s and s.strip() != 'end':
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142 try:
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143 data = binascii.a2b_uu(s)
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144 except binascii.Error, v:
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145 # Workaround for broken uuencoders by /Fredrik Lundh
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146 nbytes = (((ord(s[0])-32) & 63) * 4 + 5) // 3
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147 data = binascii.a2b_uu(s[:nbytes])
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148 if not quiet:
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149 sys.stderr.write("Warning: %s\n" % v)
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150 out_file.write(data)
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151 s = in_file.readline()
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152 if not s:
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153 raise Error('Truncated input file')
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154 finally:
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155 for f in opened_files:
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156 f.close()
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157
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158 def test():
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159 """uuencode/uudecode main program"""
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160
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161 import optparse
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162 parser = optparse.OptionParser(usage='usage: %prog [-d] [-t] [input [output]]')
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163 parser.add_option('-d', '--decode', dest='decode', help='Decode (instead of encode)?', default=False, action='store_true')
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164 parser.add_option('-t', '--text', dest='text', help='data is text, encoded format unix-compatible text?', default=False, action='store_true')
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165
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166 (options, args) = parser.parse_args()
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167 if len(args) > 2:
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168 parser.error('incorrect number of arguments')
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169 sys.exit(1)
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170
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171 input = sys.stdin
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172 output = sys.stdout
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173 if len(args) > 0:
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174 input = args[0]
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175 if len(args) > 1:
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176 output = args[1]
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177
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178 if options.decode:
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179 if options.text:
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180 if isinstance(output, basestring):
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181 output = open(output, 'w')
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182 else:
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183 print sys.argv[0], ': cannot do -t to stdout'
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184 sys.exit(1)
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185 decode(input, output)
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186 else:
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187 if options.text:
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188 if isinstance(input, basestring):
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189 input = open(input, 'r')
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190 else:
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191 print sys.argv[0], ': cannot do -t from stdin'
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192 sys.exit(1)
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193 encode(input, output)
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194
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195 if __name__ == '__main__':
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196 test()