PR file changes 如何获取指定后缀文件的增加行数？

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for example: 输入 file changes: [1.py:+20 -10][2.py:+10 -20][3.pyc:+5 -25], fileter: *.py 输出 30

有这样的接口不？

PR file changes 如何获取 指定后缀文件的 增加行数？