Mercurial > cpython-lru_cache-weakref

annotate Lib/gopherlib.py @ 1590:ac2e5cc29949 legacy-trunk

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Added tests for missing host to open_http and open_gopher
author Guido van Rossum <guido@python.org>
date Mon, 18 Apr 1994 09:39:56 +0000
parents 6d35308261f4
children 7f891f32864c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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6d35308261f4 Towards a standard access mechanism for URLs.
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1 # Gopher protocol client interface
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2
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3 import string
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4
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5 # Default selector, host and port
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6 DEF_SELECTOR = '1/'
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7 DEF_HOST = 'gopher.micro.umn.edu'
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8 DEF_PORT = 70
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9
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10 # Recognized file types
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11 A_TEXT = '0'
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12 A_MENU = '1'
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13 A_CSO = '2'
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14 A_ERROR = '3'
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15 A_MACBINHEX = '4'
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16 A_PCBINHEX = '5'
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17 A_UUENCODED = '6'
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18 A_INDEX = '7'
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19 A_TELNET = '8'
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20 A_BINARY = '9'
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21 A_DUPLICATE = '+'
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22 A_SOUND = 's'
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23 A_EVENT = 'e'
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24 A_CALENDAR = 'c'
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25 A_HTML = 'h'
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26 A_TN3270 = 'T'
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27 A_MIME = 'M'
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28 A_IMAGE = 'I'
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29 A_WHOIS = 'w'
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30 A_QUERY = 'q'
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31 A_GIF = 'g'
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32 A_HTML = 'h' # HTML file
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33 A_WWW = 'w' # WWW address
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34 A_PLUS_IMAGE = ':'
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35 A_PLUS_MOVIE = ';'
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36 A_PLUS_SOUND = '<'
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37
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38
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39 # Function mapping all file types to strings; unknown types become TYPE='x'
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40 _names = dir()
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41 _type_to_name_map = None
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42 def type_to_name(gtype):
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43 global _type_to_name_map
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44 if not _type_to_name_map:
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45 for name in _names:
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46 if name[:2] == 'A_':
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47 _type_to_name_map[eval(name)] = name[2:]
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48 if _type_to_name_map.has_key(gtype):
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49 return _type_to_name_map[gtype]
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50 return 'TYPE=' + `gtype`
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51
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52 # Names for characters and strings
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53 CRLF = '\r\n'
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54 TAB = '\t'
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55
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56 # Send a selector to a given host and port, return a file with the reply
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57 def send_selector(selector, host, *args):
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58 import socket
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59 import string
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60 if args:
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61 if args[1:]: raise TypeError, 'too many args'
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62 port = args[0]
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63 else:
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64 port = None
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65 i = string.find(host, ':')
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66 if i >= 0:
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67 host, port = host[:i], string.atoi(host[i+1:])
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68 if not port:
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69 port = DEF_PORT
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70 elif type(port) == type(''):
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71 port = string.atoi(port)
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72 s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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73 s.connect(host, port)
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74 s.send(selector + CRLF)
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75 s.shutdown(1)
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76 return s.makefile('r')
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77
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78 # Send a selector and a query string
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79 def send_query(selector, query, host, *args):
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80 return apply(send_selector, (selector + '\t' + query, host) + args)
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81
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82 # The following functions interpret the data returned by the gopher
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83 # server according to the expected type, e.g. textfile or directory
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84
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85 # Get a directory in the form of a list of entries
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86 def get_directory(f):
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87 import string
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88 list = []
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89 while 1:
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90 line = f.readline()
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91 if not line:
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92 print '(Unexpected EOF from server)'
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93 break
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94 if line[-2:] == CRLF:
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95 line = line[:-2]
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96 elif line[-1:] in CRLF:
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97 line = line[:-1]
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98 if line == '.':
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99 break
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100 if not line:
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101 print '(Empty line from server)'
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102 continue
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103 gtype = line[0]
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104 parts = string.splitfields(line[1:], TAB)
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105 if len(parts) < 4:
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106 print '(Bad line from server:', `line`, ')'
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107 continue
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108 if len(parts) > 4:
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109 if parts[4:] != ['+']:
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110 print '(Extra info from server:', parts[4:], ')'
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111 else:
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112 parts.append('')
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113 parts.insert(0, gtype)
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114 list.append(parts)
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115 return list
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116
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117 # Get a text file as a list of lines, with trailing CRLF stripped
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118 def get_textfile(f):
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119 list = []
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120 get_alt_textfile(f, list.append)
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121 return list
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122
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123 # Get a text file and pass each line to a function, with trailing CRLF stripped
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124 def get_alt_textfile(f, func):
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125 while 1:
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126 line = f.readline()
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127 if not line:
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128 print '(Unexpected EOF from server)'
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129 break
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130 if line[-2:] == CRLF:
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131 line = line[:-2]
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132 elif line[-1:] in CRLF:
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133 line = line[:-1]
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134 if line == '.':
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135 break
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136 if line[:2] == '..':
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137 line = line[1:]
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138 func(line)
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139
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140 # Get a binary file as one solid data block
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141 def get_binary(f):
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142 data = f.read()
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143 return data
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144
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145 # Get a binary file and pass each block to a function
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146 def get_alt_binary(f, func, blocksize):
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147 while 1:
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148 data = f.read(blocksize)
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149 if not data:
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150 break
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151 func(data)
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152
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153 # Trivial test program
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154 def test():
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155 import sys
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156 import getopt
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157 opts, args = getopt.getopt(sys.argv[1:], '')
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158 selector = DEF_SELECTOR
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159 type = selector[0]
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160 host = DEF_HOST
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161 port = DEF_PORT
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162 if args:
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163 host = args[0]
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164 args = args[1:]
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165 if args:
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166 type = args[0]
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167 args = args[1:]
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168 if len(type) > 1:
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169 type, selector = type[0], type
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170 else:
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171 selector = ''
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172 if args:
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173 selector = args[0]
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174 args = args[1:]
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175 query = ''
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176 if args:
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177 query = args[0]
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178 args = args[1:]
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179 if type == A_INDEX:
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180 f = send_query(selector, query, host)
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181 else:
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182 f = send_selector(selector, host)
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183 if type == A_TEXT:
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184 list = get_textfile(f)
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185 for item in list: print item
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186 elif type in (A_MENU, A_INDEX):
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187 list = get_directory(f)
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188 for item in list: print item
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189 else:
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190 data = get_binary(f)
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191 print 'binary data:', len(data), 'bytes:', `data[:100]`[:40]
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192
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193 # Run the test when run as script
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194 if __name__ == '__main__':
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195 test()