Python：为什么它不接受01或02或03的输入？

Question

print "What is your name?",
name = len(raw_input())
print name
print "How old are you?",
age = int(input())
print "What month were you born in? ",
month = int(input())
if (month>12) or (0>month):
    print "That does not exist"
else:
    all = (name+age+month)
    print "Your name length plus your age plus",
    print "the month you were born is equal to:", 
    print all

If you run the code it works but when prompting to input a month number, if you input 8 it works but if you input 08 it doesn't. Can someone please tell me why. I am using Python 2.7

Answer 1

In python2.x, 0 is the prefix for octal numbers...

>>> 010
8

So, some numbers will be invalid ... eg 08 (since that is out of the range of octal numbers).

If you change the code to use int(raw_input('...')) , it should work since int always assumes base 10 unless you say otherwise.

>>> int('08')
8

Answer 2

You are using input() for your numbers which according to the docs is

Equivalent to eval(raw_input(prompt)).

"8" is valid python but "08" isn't.

change your calls to raw_input() and it will work as expected.