我想用input()輸入一個整數，結果報錯：
　　TypeError: ‘str’ object cannot be interpreted as an integer

　　原來input()返回的值是str，比如輸入5，其實得到的是 ‘5’
　　其實只需要再用int()轉換一下，就能得到我想要的整數了。

　　這裡是檢視input的help:

>>>help(input)
    Help on built-in function input in module builtins:
    input(prompt=None, /)
        Read a string
 
 from standard input.  The trailing newline is stripped.
    The prompt string, if given, is printed to standard output without a
    trailing newline before reading input.
    If the user hits EOF (*nix: Ctrl-D, Windows: Ctrl-Z+Return), raise EOFError.
    On *nix systems, readline is used if available.