https://python3-cookbook.readthedocs.io/zh_CN/latest/c14/p01_testing_output_sent_to_stdout.htmlhttps://python3-cookbook.readthedocs.io/zh_CN/l
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https://python3-cookbook.readthedocs.io/zh_CN/latest/c14/p01_testing_output_sent_to_stdout.html
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