a function to write or not

[Skaperen]

in a container like a sequence or set, i want to replace every item that is also in another argument container with a given value, returning a like-the-first-type container.

like above for mutable sequences and sets, replace items in place.

n a container, i want to count every item that is in another argument (set, tuple, list, frozen set) returning just one total for all

[Yoriz]

[Skaperen]

should i write those or does Python already have a way to do those?

[Yoriz]

To write or not to write but what is the question

[Skaperen]

the question is: is there anything in Python that justifies not writing them?