The len( ) function in Python is used to find the length of a list, (i.e., the number of elements in a list). Usually, the len( ) function is used to set the upper limit in a loop to read all the elements of a list. If a list contains another list as an element, len( ) returns that inner list as a single element.
Example : Accessing single element
>>> MySubject = [“Tamil” , “English” , “Comp. Science” , “Maths”]
>>> len(MySubject)
4