Little-known pitfalls of strip() in python

When using Python, I discovered a pitfall of the strip() command.

The previous understanding of strip(X) is: remove the "X" string contained at the beginning and end. If it is not included, it will not be removed.

One pitfall here is that python processes string X as a set, not as a fixed sequence of strings. In other words, X is treated as a set consisting of single letters. If the string being stripped() contains any character in the set on the left and right sides, it will be stripped(). Examples are as follows:

[python] view plain copy
 
>>> a="abc_1213"  
>>> a.strip('abc_')  
'1213'  
>>> a.strip('ba_c')  
'1213'  
>>> a.strip('zxcvbnmasdfghjklpoiuytrewq')  
'_1213'  
>>> a.strip('zxcvbnmasdfg_hjklpoiuytrewq')  
'1213'

At the beginning, my personal understanding is the first situation. After strip('abc_'), only the "abc_" on the left will be removed.

After the experiment, it was confirmed that the string to be stripped is treated as a set. As long as the characters on the left and right sides are in the set, they will be removed one by one until the first character not in the set is encountered.

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