avelino/pycorreios

$ easy_install -U pycorreios

$ python setup.py install

from pycorreios import Correios

# with a dictionary paramenter - the field order doesn't matter
fields = {
          "cod": Correios.SEDEX, 
          "GOCEP": "44001535",
          "HERECEP": "03971010",
          "peso": "1",
          "formato": "1", # caixa/pacote
          "comprimento": "18",
          "altura": "9",
          "largura": "13.5",
          "diametro": "0"
          }

test = Correios().frete(**fields)   # remember to call with **

# or with positional parameters - same result as above
test = Correios().frete(Correios.SEDEX, '44001535', '03971010', 1, 1, 18, 9, 13.5, 0)

if test['Erro'] != '0':
    print 'Deu erro! :('
    print test['Erro']
    print test['MsgErro']
else:
    print "Valor: R$%s\nPrazo de Entrega: %s" % (test['Valor'],test['PrazoEntrega'])


other_test = Correios().cep('03971010')

for tag_name in other_test.keys():
    print tag_name + ': ' + other_test[tag_name]
    
other_test = Correios().encomenda('PJ382325976BR')

for tag_name in other_test.keys():
    print tag_name + ': ' + other_test[tag_name]