os.path.getmtime(path)
Return the time of last modification of path. The return value is a number giving the number of seconds since the epoch (see thetime module). Raise os.error if the file does not exist or is inaccessible.
这是文档原文,试了一下,返回了一个极大的数,搞不太懂这个函数什么意思,有什么用呢?
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