Fórmula de Bhaskara

# -*- coding: cp1252 -*-
# Formula de Bhaskara by tchandy < tchandy@gmail.com >
from math import sqrt
import sys
def getvalor():
return float(numb) ** 2 - 4 * float(numa) * float(numc)
print
print
print "Formula de Bhaskara"
print
print
while 1:
try:
numa = float(raw_input("Insira o valor de A: "))
print
numb = float(raw_input("Insira o valor de B: "))
print
numc = float(raw_input("Insira o valor de C: "))
print
break
except:
print
print "Insira um Numero Valido"
print
while 1:
try:
res1 = (- float(numb) + sqrt(getvalor()))
res2 = (- float(numb) - sqrt(getvalor()))
x1 = res1 / (2.0 * float(numa))
x2 = res2 / (2.0 * float(numa))
print "O Resultado eh"
print "X1 = %s." % x1
print "X2 = %s." % x2
break
except:
print
print "Nao existem raizes para esses numeros"
print
sys.exit()