（一）“from module import *” 警告
一般不建议使用from module import * ，最好是导入相对应的函数即可！
如果出现警告unable to detect undefined names，解决办法：
Your IDE is complaining, not Python. When you do from simple import *, you import everything exposed by simple. This is typically not recommended because it pollutes the global namespace and may implicitly overwrite an existing object.
You get a warning instead of an error because this behavior is not always bad. Having an init.py file that exposes objects from sub-modules is a very common pattern. As long as you understand the potential risks, just silence the warning:
不推荐
from .input import * # NOQA
If your modules don’t expose many objects, just import them by name:
推荐
from .input import A, B, C
This has the benefit of allowing Python code analysis tools to better understand your code and warn you of potential issues.
关于#NOQA这个注释的作用是，告诉PEP8规范检测工具，这个地方不需要检测。也可以在一个文件第一行增加 # NOQA 来告诉规范检测工具，这个文件不用检查。
