[Python] for.. not in.. Remove Deduplication

Write a function,

remove_duplicates

that takes a list as its argument and returns a new list containing the unique elements of the original list. The elements in the new list without duplicates can be in any order.

Suggested test cases: Try an input list with no duplicate elements. The output list should be the same size as the original list. Try a small input list with a known number of unique entries, and some duplicates. Verify that the list without duplicates has the correct length.

def remove_duplicates(source):
target = []

for element in source:
if element not in target:
target.append(element)

return target