## page was renamed from ParâmetrosnoShell
= 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:


{{{
#!python

#!/usr/bin/python
# Rod Senra 2005
# This code is in the public domain.
# Quick, rough, ugly and dirty holiday hack, not robust at all!

# Uso:
# $ python translate.py paz pt-br en
# peace
# 

import sys
from urllib2 import urlopen, Request
from string import Template

# Not in stdlib, but handy for
# quick&dirty hacks like this
from BeautifulSoup import BeautifulSoup

# Some google magic spells
google_template = Template("http://translate.google.com/translate_t"\
                            "?text=$word&langpair=$from_lang%7C$to_lang"\
                            "&hl=en&ie=$encoding")

# extremely user-enemy interface
# people can improve on this with their
# optparse knowledge. I'm not in the mood right now ;o)
params={'word':sys.argv[1].strip(),
         'from_lang':sys.argv[2].strip(),
         'to_lang':sys.argv[3].strip(),
         'encoding':'ISO-8859-15'}

query_url = google_template.substitute(params)

req = Request(query_url)

# I had to lie here to be accepted, did not bothered
# to explore further ;o)
req.add_header('User-Agent','User-Agent: Mozilla/5.0')
req.add_header('Accept','text/xml,application/xml,application/xhtml\
+xml,text/html,text/plain')
req.add_header('Accept-Encoding','identity')
req.add_header('Accept-Charset','ISO-8859-1,utf-8;q=0.7,*;q=0.7')
req.add_header('Connection','keep-alive')

page = urlopen(req)
page_result = page.read()
# print page.headers, page_result

# get the beef ;o)
soup = BeautifulSoup()
soup.feed(page_result)
beef = soup.first('textarea')
translated = beef.contents[0].string
print translated
}}}


{{{
#!python

#!/usr/bin/python

# Uso:
# $ python parametros.py -o argumento_requerido
# teste
# 

from optparse import OptionParser

def main():
    parser = OptionParser()

    parser.add_option("-f", "--arquivo",  help="Imprime em arquivo")
    parser.add_option("-q", "--silencia", help="Não imprime a mensagem de saída")
    parser.add_option("-o", "--saida",    help="Imprime a mensagem de saída")

    (options, args) = parser.parse_args()

    if options.arquivo:
        import codecs
        f = codecs.open('optparse_teste.txt', 'a', 'utf-8')
        f.write("teste")
        f.close()
                
    if options.silencia:
        print ("")
        
    if options.saida:
        print ("teste")

if __name__ == "__main__":
    main()
}}}

Volta para CookBook.

----

LeonardoGregianin