Remove duplicates from a list in Python

The python built in function 'set()' helps to remove the duplicates from a list.

consider an example:

>>> list1 = [1, 2, 3, 1, 2, 5, 6, 7, 8]
>>> list1
[1, 2, 3, 1, 2, 5, 6, 7, 8]
>>> set(list1)
set([1, 2, 3, 5, 6, 7, 8])
>>> list(set(list1))
[1, 2, 3, 5, 6, 7, 8]
>>>

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