61 提取后缀名
>>> import os
>>> os.path.splitext('D:/source/dataset/new_file.txt')
('D:/source/dataset/new_file', '.txt') #[1]:后缀名
62 提取完整文件名
>>> import os
>>> os.path.split('D:/source/dataset/new_file.txt')
('D:/source/dataset', 'new_file.txt')
>>> import os
>>> os.path.splitext('D:/source/dataset/new_file.txt')
('D:/source/dataset/new_file', '.txt') #[1]:后缀名
>>> import os
>>> os.path.split('D:/source/dataset/new_file.txt')
('D:/source/dataset', 'new_file.txt')
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