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Brincando com recursos do Python para calcular se um cpf é válido
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# coding: utf-8 | |
def cpf_checksum(value): | |
""" | |
CPF Checksum algorithm. | |
""" | |
def dv(partial): | |
s = sum(b * int(v) for b, v in zip(range(len(partial)+1, 1, -1), partial)) | |
return s % 11 | |
dv1 = 11 - dv(value[:9]) | |
q2 = dv(value[:10]) | |
dv2 = 11 - q2 if q2 >= 2 else 0 | |
return dv1 == int(value[9]) and dv2 == int(value[10]) | |
def tests(): | |
assert cpf_checksum('11144477735') == True | |
assert cpf_checksum('21111111120') == True | |
assert cpf_checksum('00000000000') == False | |
tests() |
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Outra implementação mais procedural da função dv: