How to duplicate elements in a list in python

There are several methods to deduplicate elements in a list in Python:

Method 1:

Use the built-in function set: (Recommendation: What does set mean in python)

list1 = [1, 2, 3, 3, 4, 4, 5, 6, 6, 6, 7, 8, 9]
list2 = list(set(list1)) 
print(list2)

Method 2:

Traverse to remove duplicates (Recommendation: What are the methods for traversing a list in Python )

list1 = [1, 2, 3, 3, 4, 4, 5, 6, 6, 6, 7, 8, 9]
list2=[]
for i in list1:
    if not i in list2:
        list2.append(i)
print(list2)

List derivation

list1 = [1, 2, 3, 3, 4, 4, 5, 6, 6, 6, 7, 8, 9]
list2=[]
[list2.append(i) for i in list1 if not i in list2]

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