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sort It sorts the list in-place, mutating its indexes and returning None. a1 = [6, 3, 9] print('a1:', a1) a2 = a1.sort() # it sorts original(in-place) print('-----after sorting-----') print('a1:', a1) print('a2:', a2) >>> a1: [6, 3, 9] -----after sorting----- a1: [3, 6, 9] a2: None sorted It returns a new sorted list, leaving the original list unchanged. b1 = [6, 3, 9] print('b1:', b1) b2 = sort..

setIt returns unique items.my_set={1,2,3,1,2}print(my_set)>>>{1, 2, 3}your_set=set([1,2,3,2,1])your_set>>>{1, 2, 3}set('abracadabra')>>>{'a', 'b', 'c', 'd', 'r'} countIt returns the number of elements with the specified value.fruits = ['apple', 'banana', 'cherry','banana', 'apple']fruits.count('apple')>>>2 index(x,n)Return zero-based index in the list of the first..