#pragma section-numbers off
= Receita: Classe para lidar com CPF =

Classe para lidar mais facilmente com CPF.

== Código ==

{{{
#!python
class Cpf:
    def __init__( self ):
        """ 
        Class to interact with CPF numbers
        """
        pass

    def format( self, cpf ):
        """ 
        Method that formats a brazilian CPF
        
        Tests:
        >>> print Cpf().format('91289037736')
        912.890.377-36
        """
        return "%s.%s.%s-%s" % ( cpf[0:3], cpf[3:6], cpf[6:9], cpf[9:11] )

    def validate( self, cpf ):
        """ 
        Method to validate a brazilian CPF number 
        Based on Pedro Werneck source avaiable at
        www.PythonBrasil.com.br
        
        Tests:
        >>> print Cpf().validate('91289037736')
        True
        >>> print Cpf().validate('91289037731')
        False
        """
        cpf_invalidos = [11*str(i) for i in range(10)]
        if cpf in cpf_invalidos:
            return False
       
        if not cpf.isdigit():
            """ Verifica se o CPF contem pontos e hifens """
            cpf = cpf.replace( ".", "" )
            cpf = cpf.replace( "-", "" )

        if len( cpf ) < 11:
            """ Verifica se o CPF tem 11 digitos """
            return False
            
        if len( cpf ) > 11:
            """ CPF tem que ter 11 digitos """
            return False
            
        selfcpf = [int( x ) for x in cpf]
        
        cpf = selfcpf[:9]
        
        while len( cpf ) < 11:
        
            r =  sum( [( len( cpf )+1-i )*v for i, v in [( x, cpf[x] ) for x in range( len( cpf ) )]] ) % 11
        
            if r > 1:
                f = 11 - r
            else:
                f = 0
            cpf.append( f )
        
        
        return bool( cpf == selfcpf )

# test
#import doctest ; doctest.testmod()
}}}

== Exemplo de uso ==

Dentro do próprio código. Nas docstrings.

Volta para CookBook.

----

Murtog