我是用 Python 3 写的，但是如何防止用户输入字符串？
x = int(input("If you want to play with computer, click 0. If you want to play with your friend, click 1. "))
使用try/except
while True:
user_input = input("If you want to play with computer, click 0. If you want to play with your friend, click 1. ")
try:
user_input = int(user_input)
# do something
break
except ValueError:
print("input a valid choice please")
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我来说两句