Python edabit Challenge : Length of a Nested List

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Length of a Nested List
Python's len() method will return the number of elements in a list. For example, the list below contains 2 elements:

Suppose we instead wanted to know the total number of non-nested items in the nested list. In the above case, [1, [2, 3]] contains 3 non-nested items, 1, 2 and 3.

Create a function that returns the total number of non-nested items in a nested list.