类型错误：不支持-：“str”和“int”的操作数类型

Question

python和编程新手我怎么会得到这个错误？

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)

Answer 1

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)。

2. 在Python中，通常不会手动跟踪索引。实现这种功能的更好方法是

   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)
   

3. 我把你的API改了一点。在我看来，n应该是的次数，而s应该是的字符串。