Why doesn't my squaring function run?

问题

I decided to make a program that would square a number just for fun. Using an online compiler, I entered my code and from what I saw there were no errors; it wouldn't run it would just have a blank console entry.

My code:

import math

def square():
    number = raw_input("Please enter a number for me to square.")  
    number*number  
    print "Your answer is..."  
    print number  

Repl.it output:

回答1:

Do make sure you also call your function:

def square():
    # your function body here

square()

But in your function, you are ignoring the result of your calculation here:

number*number

Assign that result to something:

answer = number * number
print "Your answer is..."  
print answer  

You don't have a number, however. raw_input() returns a string, so you want to convert that to a number first:

number = int(number)

This assumes that the user actually entered something that can be converted to an integer; digits only, plus perhaps some whitespace and a + or - at the start. If you wanted to handle user errors gracefully here, take a look at Asking the user for input until they give a valid response for more advanced options.

来源：https://stackoverflow.com/questions/27253706/why-doesnt-my-squaring-function-run