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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..

copy Under the same object, one can change one copy without changing the other. Therefore, if one of them changed, the other one will be changed affected by changed one. a = [1, 2, 3, 4] b = a # shallow copy print(b) # [1, 2, 3, 4] b[2] = 100 print(b) # [1, 2, 100, 4] print(a) # [1, 2, 100, 4] copy.copy Shallow copy, once copy from one to another one, its reference is same object. Copy only the ..