Mercurial > hg > GlobalNeighbors

annotate globalneighbors/web.py @ 20:2fef925fbf37

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display country + population in autocomplete drop down
author Jeff Hammel <k0scist@gmail.com>
date Sun, 25 Jun 2017 16:12:08 -0700
parents 21095c9006e5
children e69cb496324e
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1 #!/usr/bin/env python
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2
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3 """
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4 web handler for GlobalNeighbors
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5 """
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6
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7 # imports
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8 import argparse
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9 import json
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10 import os
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11 import sys
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12 import time
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13 from paste import httpserver
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14 from paste.urlparser import StaticURLParser
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15 from webob import Request, Response, exc
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16 from wsgiref import simple_server
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17 from .locations import locations
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18 from .locations import city_dict
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19 from .neighbors import read_neighbors_file
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20 from .read import read_cities
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21 from .read import read_city_list
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22 from .schema import fields
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23 from .schema import name
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24 from .template import template_dir
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25 from .template import TemplateLoader
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27 here = os.path.dirname(os.path.abspath(__file__))
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28 static_dir = os.path.join(here, 'static')
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30
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31 class PassthroughFileserver(object):
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32
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33 """serve files if they exist"""
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35
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36 def __init__(self, app, directory=static_dir):
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37 self.app = app
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38 self.directory = directory
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39 self.fileserver = StaticURLParser(self.directory)
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40
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41 def __call__(self, environ, start_response):
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42
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43 path = environ['PATH_INFO'].strip('/')
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44
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45 if path and os.path.exists(os.path.join(self.directory, path)) and '..' not in path:
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46
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47 return self.fileserver(environ, start_response)
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48 return self.app(environ, start_response)
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49
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51 def autocomplete(cities, startswith=None, limit=None):
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52 """autocomplete function for city names"""
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53 ### TODO:
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54 # - sort once, ahead of time
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55 # - return most populous cities
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56
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57 if startswith:
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58 retval = []
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59 for i in cities:
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60 if i[name].startswith(startswith):
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61 retval.append({"name": i[name],
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62 "country code": i["country code"],
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63 "population": i['population'],
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64 "geonameid": i['geonameid']})
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65 else:
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66 retval = [{"name": i[name],
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67 "country code": i["country code"],
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68 "population": i['population'],
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69 "geonameid": i['geonameid']}
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70 for i in cities]
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71 return sorted(retval,
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72 key=lambda x: (x['name'],
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73 -x['population'])
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74 )[:limit]
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77 class Handler(object):
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78 """base class for HTTP handler"""
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79
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80 def __call__(self, environ, start_response):
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81 request = Request(environ)
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82 method = getattr(self, request.method, None)
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83 response = None
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84 if method is not None:
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85 response = method(request)
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86 if response is None:
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87 response = exc.HTTPNotFound()
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88 return response(environ, start_response)
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90
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91 class CitiesHandler(Handler):
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92 """cities ReST API"""
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93
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94 content_type = 'application/json'
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95
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96 def __init__(self, locations, cities):
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97 self.locations = locations
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98 self._cities = cities
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99
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100
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101 def cities(self, startswith=None):
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102 """return list of cities"""
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103 return autocomplete(self._cities.values(),
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104 startswith=startswith)
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105
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106 def GET(self, request):
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107 return Response(content_type=self.content_type,
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108 body=json.dumps(self.cities(
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109 startswith=request.GET.get('term'))))
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111
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112 class GlobalHandler(Handler):
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113 """WSGI HTTP Handler"""
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114
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115 content_type = 'text/html'
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116
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117 def __init__(self,
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118 datafile,
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119 neighbors_file=None,
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120 template_dir=template_dir):
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121
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122
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123 # parse data
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124 self.datafile = datafile
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125 self.cities = read_city_list(self.datafile,
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126 fields=fields)
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127 self.locations = locations(self.cities)
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128 if neighbors_file:
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129 pass # TODO
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130
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131 # get country codes
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132 self.country_codes = sorted(set([city['country code']
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133 for city in self.cities
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134 if city['country code']]))
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135
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136 # convert cities to a dict for lookup
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137 self.cities = {city['geonameid'] : city
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138 for city in self.cities}
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139
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140
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141 # declare handlers
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142 self.handlers = {'/cities':
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143 CitiesHandler(self.locations,
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144 self.cities)}
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145
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146 # template loader
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147 self.loader = TemplateLoader(template_dir)
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148 self.index = self.loader.load('index.html')
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149 self.citypage = self.loader.load('city.html')
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150
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151
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152 def GET(self, request):
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153 if request.path_info in ('', '/'):
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154 # Landing page
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155 body = self.index.render(n_cities=len(self.cities),
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156 country_codes=self.country_codes)
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157 return Response(content_type=self.content_type,
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158 body=body)
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159
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160 elif request.path_info in self.handlers:
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161 return request.get_response(self.handlers[request.path_info])
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162 else:
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163 try:
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164 geoid = int(request.path.strip('/'))
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165 city = self.cities.get(geoid)
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166 if not city:
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167 return
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168 variables = dict(city=city)
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169 return Response(content_type=self.content_type,
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170 body=self.citypage.render(variables))
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171 except ValueError:
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172 pass
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174
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175
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176 def main(args=sys.argv[1:]):
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177 """CLI"""
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178
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179 # parse command line
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180 parser = argparse.ArgumentParser(description=__doc__)
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181 parser.add_argument('cities',
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182 help="cities1000 data file")
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183 parser.add_argument('-p', '--port', dest='port',
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184 type=int, default=8080,
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185 help="port to serve on")
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186 parser.add_argument('--hostname', dest='hostname',
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187 default='localhost',
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188 help="host name [DEFAULT: %(default)s]")
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189 parser.add_argument('--neighbors', dest='neighbors_file',
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190 help="file for nearest neighbors")
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191 options = parser.parse_args(args)
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192
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193 # instantiate WSGI handler
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194 app = GlobalHandler(datafile=options.cities,
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195 neighbors_file=options.neighbors_file)
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196
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197 # wrap it in a static file server
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198 app = PassthroughFileserver(app)
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199
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200 print ("Serving on http://{hostname}:{port}/".format(**options.__dict__))
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201 try:
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202 httpserver.serve(app, host='0.0.0.0', port=options.port)
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203 except KeyboardInterrupt:
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204 pass
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206
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207 if __name__ == '__main__':
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208 main()