Share a detailed explanation of the string function (partition) in Python

The partition() function is mentioned here. What does it do? In fact, this function is similar to split, both of which are used for cutting.

partition(...)
    S.partition(sep) -> (head, sep, tail)
    
    Search for the separator sep in S, and return the part before it,
    the separator itself, and the part after it.  If the separator is not
    found, return S and two empty strings.

For example:

>>> a = 'changzhi1990'
>>> a.rpartition('h')
('changz', 'h', 'i1990')

You can see that a three-element tuple is returned, which is the string on the left side of 'h'. #, the separator 'h' itself, and the string to the right of the separator 'h'. Note: r means matching from right to left.

>>> a = 'changzhi1990'
>>> a.partition('h')
('c', 'h', 'angzhi1990')

Here is matching from left to right.

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