Added comments

[Greeshmanth1]

I have updated the run time complexities for the "len()" methods.

[Greeshmanth1]

Incorporating runtime complexities in the documentation for the len() method offers clear insight and dispels potential confusion among users. Unlike the traditional len() method, which operates in O(n) time complexity, this implementation achieves O(1). This distinction is crucial for understanding the efficiency of this code.

[grantjenks]

Unlike the traditional len() method, which operates in O(n) time complexity
What are you referring to?

[Greeshmanth1]

Traditional len() method TC is O(n).

myList=[1,2,3,4,5,]
print(len(myList)) #Output --> 5

In the above example the len() have O(n) complexity, But in your implementation it's just O(1). So i have added the TC in comments, so it can be helpful to the users to mention it.

[xintenseapple]

I believe len(list) and len(set) are both O(1) operations in Python, as they are here. It doesn't hurt to add though.