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ParametrosNoShell

Receita: Entrada de parâmetros pela linha de comando

Há duas formas de se passar parâmetros pela linha de comando, uma pelo módulo optparse e outra pelo sys.argv, veja as duas:

   1 #!/usr/bin/python
   2 # Rod Senra 2005
   3 # This code is in the public domain.
   4 # Quick, rough, ugly and dirty holiday hack, not robust at all!
   5 
   6 # Uso:
   7 # $ python translate.py paz pt-br en
   8 # peace
   9 # 
  10 
  11 import sys
  12 from urllib2 import urlopen, Request
  13 from string import Template
  14 
  15 # Not in stdlib, but handy for
  16 # quick&dirty hacks like this
  17 from BeautifulSoup import BeautifulSoup
  18 
  19 # Some google magic spells
  20 google_template = Template("http://translate.google.com/translate_t"\
  21                             "?text=$word&langpair=$from_lang%7C$to_lang"\
  22                             "&hl=en&ie=$encoding")
  23 
  24 # extremely user-enemy interface
  25 # people can improve on this with their
  26 # optparse knowledge. I'm not in the mood right now ;o)
  27 params={'word':sys.argv[1].strip(),
  28          'from_lang':sys.argv[2].strip(),
  29          'to_lang':sys.argv[3].strip(),
  30          'encoding':'ISO-8859-15'}
  31 
  32 query_url = google_template.substitute(params)
  33 
  34 req = Request(query_url)
  35 
  36 # I had to lie here to be accepted, did not bothered
  37 # to explore further ;o)
  38 req.add_header('User-Agent','User-Agent: Mozilla/5.0')
  39 req.add_header('Accept','text/xml,application/xml,application/xhtml\
  40 +xml,text/html,text/plain')
  41 req.add_header('Accept-Encoding','identity')
  42 req.add_header('Accept-Charset','ISO-8859-1,utf-8;q=0.7,*;q=0.7')
  43 req.add_header('Connection','keep-alive')
  44 
  45 page = urlopen(req)
  46 page_result = page.read()
  47 # print page.headers, page_result
  48 
  49 # get the beef ;o)
  50 soup = BeautifulSoup()
  51 soup.feed(page_result)
  52 beef = soup.first('textarea')
  53 translated = beef.contents[0].string
  54 print translated

   1 #!/usr/bin/python
   2 
   3 # Uso:
   4 # $ python parametros.py -o argumento_requerido
   5 # teste
   6 # 
   7 
   8 from optparse import OptionParser
   9 
  10 def main():
  11     parser = OptionParser()
  12 
  13     parser.add_option("-f", "--arquivo",  help="Imprime em arquivo")
  14     parser.add_option("-q", "--silencia", help="Não imprime a mensagem de saída")
  15     parser.add_option("-o", "--saida",    help="Imprime a mensagem de saída")
  16 
  17     (options, args) = parser.parse_args()
  18 
  19     if options.arquivo:
  20         import codecs
  21         f = codecs.open('optparse_teste.txt', 'a', 'utf-8')
  22         f.write("teste")
  23         f.close()
  24                 
  25     if options.silencia:
  26         print ("")
  27         
  28     if options.saida:
  29         print ("teste")
  30 
  31 if __name__ == "__main__":
  32     main()

Volta para CookBook.


LeonardoGregianin