os.path.basename(path): 返回path最后的文件名称

>>> import os
>>> path = "usr/linxi/Desktop/data.cvs"
>>> os.path.basename(path)
'data.cvs'
>>> path = "c:\windows\tools\data.csv"
>>> os.path.basename(path)
'data.csv'
>>> path = "usr/linxi/Desktop/"
>>> os.path.basename(path)
''

从上面可以看出，如果path以／结尾，那么就会返回空值