How to find the union of two lists in Python - example (lists and sets in Python)

Hi everyone.
In this lesson we're going to talk about that how to find the union of two lists in Python.

[aman]

it's wrong in some cases of list,
for example:
a=[2, 2, 3, 4]
b=[2, 3, 5, 5]
a U b supposed to be [2, 2, 3, 4, 5, 5 ]
but when you convert the list into set it will lose the repetitive data
in your method, the result will be a U b = { 2, 3, 4, 5}

[assalahamidani]

You saved me, Thank you so much T___T