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我想用input()输入一个整数，结果报错：

TypeError: ‘str’ object cannot be interpreted as an integer

原来input()返回的值是str，比如输入5，其实得到的是 ‘5’

其实只需要再用int()转换一下，就能得到我想要的整数了。

这里是查看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.