python os.rename - 文件重命名

重命名文件或者目录：

os.rename(src, dst)

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rename(src, dst, *, src_dir_fd=None, dst_dir_fd=None)
    Rename a file or directory.

    If either src_dir_fd or dst_dir_fd is not None, it should be a file
      descriptor open to a directory, and the respective path string (src or dst)
      should be relative; the path will then be relative to that directory.
    src_dir_fd and dst_dir_fd, may not be implemented on your platform.
      If they are unavailable, using them will raise a NotImplementedError.