Answer:
len(obj) is a builtin function which returns the length of an object. The obj argument can be either a sequence (lists, tuple or string) or a mapping (dictionary).
Now object.__len__(self) is the special method which is called in the implementation of len() function. For a class you define object.__len__(self) function and compute the length, then calling len(obj) on the instance gives you the length.
len() also does sanity checking on top of object.__len__(self) output.
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