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Python: Multiset Implementation

A multiset is the same as a set except that an element might occur more than once in a multiset. Implement a multiset data structure in Python. Given a template for the Multiset class, implement $4$ methods:

add$($self$,$ val$)$: adds valto the multiset

$$ remove$($self$,$ val$)$: if val is in the multiset. removes val from the multiset; otherwise, do nothing

$($self$,$ val$)$: returns True if val is in the multiset; otherwise, it returns False

$($seli$)$: returns the number of elements in the multiset

Additional methods are allowed as