I need to determine whether a selected UIColor (picked by the user) is dark or bright, so I can change the color of a line of text that sits on top of that color, for better readability.
首先得明确包和模块。包：在一个目录下存在__init__.py，那么该目录就是一个包。模块：一个.py文件就是一个模块。我们可以通过from包import模块来引入python文...
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