[Python] Why isn't the 'len' function inherited by dictionaries and lists in Python?

Example:

a_list = [1, 2, 3]
a_list.len() # Doesn't work
len(a_list) # Works


Python being (very) object-oriented, I don't understand why the 'len' function isn't inherited by the object. Plus I keep trying the wrong solution, since it appears as the logical one to me.

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