Refer to:https://www.cnblogs.com/cyiner/archive/2011/09/18/2180729.html

用Python打开文件：

 fo=open("C:\Users\WGZ\Desktop\a.txt",'r')

结果出现了这个错误：

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

大概意思是编解码器不能解码的字节的位置

解决方法是：

 fo=open(r"C:\Users\WGZ\Desktop\a.txt",'r')

原因:

加r和不加''r是有区别的

'r'是防止字符转义的 如果路径中出现'\t'的话 不加r的话\t就会被转义 而加了'r'之后'\t'就能保留原有的样子

在字符串赋值的时候 前面加'r'可以防止字符串在时候的时候不被转义 原理是在转义字符前加'\'

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