In python： The file contain the content in the form pet1，pet2，pet3 Output will return [[‘pet1’, ‘pet2’, ‘pet3’],[‘pet1’, ‘pet2’, ‘pet3’],…] or none if wrong format for example : PET.txt Cat, Dog, Turtle Hamster, Dog, Dog, , Turtle PETS = read_file(‘PET.txt’) len(PETS) Output: 3 PETS[1] Output: [‘Hamster’, ‘Dog’, None] PETS[2] Output:['Dog', None, 'Turtle'] Play.txt Hamster, Fish Crocodile Play = read_file("Play.txt") print (Play) Output : None

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A: Dear Student, Your asked method is given below -

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Stack operations

A stack is a linear data structure that follows certain order to perform the operation; the order will be LIFO (Last In First Out) data structure. In the stack data structure elements/items are removed and added only from the top. The topmost stack item/element is pointed by the top pointer and the element which is added to the stack first will get deleted at the last.