[Python] Python if statement with "in" condition not working

I'm trying some LeetCode problems and I came across a "Check Duplicates" problem.

Why doesn't it work when the function receives the array [3,3]?

Here is my code:

def containsDuplicate(nums) -> bool:
list = {}
for i in range (len(nums)):
if 3 in list:
return True
else:
list = nums
print(list)

return False

print(containsDuplicate([3, 3]))


Does anyone know why the "if" statement that's supposed to return True isn't working?

I know I could use a set or something like a hashmap, but I just want to understand what I'm doing wrong in this case.

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