os.path.join路径拼接

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import os

print("0:", os.path.join('/aaa', 'bbb', 'ccc.txt')) #0: /aaa\bbb\ccc.txt      多数这种用法

print("1:",os.path.join('aaaa','/bbbb','ccccc.txt')) #1: /bbbb\ccccc.txt   从后往前看，会从第一个以“/”开头的参数开始拼接，他之前的参数全部丢弃

print("2:",os.path.join('/aaaa','/bbbb','/ccccc.txt')) #2: /ccccc.txt

print("3:",os.path.join('aaaa','./bbb','ccccc.txt')) #3: aaaa\./bbb\ccccc.txt