most efficient way to remove duplicates in a list python code example

Example 1: how to make python remove the duplicates in list

mylist = ["a", "b", "a", "c", "c"]
mylist = list(dict.fromkeys(mylist))

  print(mylist)

Example 2: python remove duplicates from list

''' we can convert the list to set and then back to list'''
a=[1,1,2,3,4,5,6,6,7]
'''b=(list(set(a))) # will have only unique elemenets'''

Example 3: python remove duplicate numbers

duplicate = [2, 4, 10, 20, 5, 2, 20, 4] 
print(list(set(duplicate))