SyntaxError: (unicode error) 'unicodeescape' codec can't decode bytes in position 2-3: truncated \UX

用python3 的import os 访问路径时报错：
SyntaxError: (unicode error) ‘unicodeescape’ codec can’t decode bytes in position 2-3: truncated \UX
原因：文件中的\u被编译器认为是八进制
解决方法：访问路径前加一个r
$SyntaxError: (unicode error) 'unicodeescape' codec can't decode bytes in position 2-3: truncated \UX$

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