Use the built-in
input() function to read input from the user. (If you
are using Python 2, use
raw_input() instead.) These functions return a
string, so you will have to cast the returned value to an integer with the
int() function. If the user entered an invalid number, this will
ValueError that you can catch. Here is an example:
string_input = input("Enter a number: ") try: number = int(string_input) print(number) except ValueError: print("That was no number!")
And here's the result of running it:
$ python3 int.py Enter a number: 88 88 $ python3 int.py Enter a number: asdf That was no number!
You can embed the whole thing in a
while loop and break out only once a
valid number was entered.