Why is my python list append method not returning the updated list?

When you use the `append` method on a list in Python, it modifies the list in place and returns `None`. This can lead to unexpected results when trying to chain methods or operations together. Example:

nums = [1, 2, 3]
result = nums.append(4)
print(result)  # None

Solution:

nums = [1, 2, 3]
nums.append(4)
print(nums)  # [1, 2, 3, 4]

Make sure to call `append` separately and then reference the modified list.