类型错误:不支持 - 的操作数类型:'str' 和 'int' [英] TypeError: unsupported operand type(s) for -: 'str' and 'int'

问题描述

我怎么会收到这个错误?

How come I'm getting this error?

我的代码:

def cat_n_times(s, n):
    while s != 0:
        print(n)
        s = s - 1

text = input("What would you like the computer to repeat back to you: ")
num = input("How many times: ")

cat_n_times(num, text)

错误:

TypeError: unsupported operand type(s) for -: 'str' and 'int'

推荐答案

1. 失败的原因是 (Python 3) input 返回一个字符串.要将其转换为整数，请使用 int(some_string).

1. The reason this is failing is because (Python 3) input returns a string. To convert it to an integer, use int(some_string).

您通常不会在 Python 中手动跟踪索引.实现这种功能的更好方法是

You do not typically keep track of indices manually in Python. A better way to implement such a function would be

def cat_n_times(s, n):
    for i in range(n):
        print(s) 

text = input("What would you like the computer to repeat back to you: ")
num = int(input("How many times: ")) # Convert to an int immediately.

cat_n_times(text, num)

我稍微改变了你的 API.在我看来，n 应该是 次数，s 应该是 string.

I changed your API above a bit. It seems to me that n should be the number of times and s should be the string.

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