error handling

while 1:
    ans = raw_input("Enter a number:")
    try:
        num = int(ans)
    except ValueError:
        print "Please enter only integers"
        continue
    try:
        res = 1.0/num
    except ZeroDivisionError :
        print "Zero is not allowed!"
        continue
    break
print 1,"divided by ",num," = ",res