Is String a Number? (Part II)
给您一个字符串。您的函数应返回 True如果字符串是一个有效的数字（只包含数字和适当位置的 "+-. False.查看掩码：
[+- ][zero or more digits][.][zero or more digits]
当然，并非所有部分都是必要的（但至少有一个数字部分是必要的！）。例如，"+10....
CheckiO Extensions allow you to use local files to solve missions. More info in a blog post.
In order to install CheckiO client you'll need installed Python (version at least 3.8)
Install CheckiO Client first:
pip3 install checkio_client
Configure your tool
checkio --domain=py config --key=
Sync solutions into your local folder
checkio sync
(in beta testing) Launch local server so your browser can use it and sync solution between local file end extension on the fly. (doesn't work for safari)
checkio serv -d
Alternatevly, you can install Chrome extension or FF addon
checkio install-plugin
checkio install-plugin --ff
checkio install-plugin --chromium
Read more here about other functionality that the checkio client provides. Feel free to submit an issue in case of any difficulties.
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