refrerence:
https://stackoverflow.com/questions/1466000/difference-between-modes-a-a-w-w-and-r-in-built-in-open-function
Difference between modes a, a+, w, w+, and r+ in built-in open function?
本文详细解释了Python内置函数open()的不同模式：'a', 'a+', 'w', 'w+', 'r'等的区别及应用场景。对于理解文件读写操作至关重要。
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