python while循环用户输入

Question

Write a program that keeps asking the user for numbers until they enter a non-number.

This is what I have now, it seems I have created an infinite loop.

i = 0
count = 0
while i != (int):
    i = input("Enter a number: ")

Answer 1

You can use str.isdigit method ,Note that if you are in python 2 you need to use raw_input because isdigit() is a string method :

i='0'
count = 0
while i.isdigit():
    i = input("Enter a number: ") 

in python 2 :

i='0'
count = 0
while i.isdigit():
    i = raw_input("Enter a number: ")

Answer 2

You could ask for a number, and then check if the string entered is a digit using the built in isdigit() method. Currently your code does not ask for a digit to be entered, it just uses 0 automatically. It would not account for a user entering a non-number the very first time.

i = raw_input("Enter a number: ")
while i.isdigit():
    i = raw_input("Enter a number: ")