Stack

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A Stack is a linear data structure that follows the Last-In-First-Out (LIFO) principle. Elements are added and removed from the same end, called the TOP of the stack. Like a pile of books or plates, y…

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LIFO stands for Last-In-First-Out. In a stack, the element that was inserted last (most recently) will be the first one to be removed. This is similar to how you would remove books from a pile - you t…

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PUSH is an insertion operation that adds a new element at the TOP of the stack. In Python, this is implemented using the append() method. The new element becomes the topmost element of the stack.

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POP is a deletion operation that removes the topmost element from the stack. In Python, this is implemented using the pop() method. The element that was added most recently gets removed first, followi…

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Stack Overflow occurs when we try to add an element to a stack that is already full (has reached its maximum capacity). In Python lists, this rarely occurs as lists can grow dynamically until system m…

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Stack Underflow occurs when we try to remove an element from an empty stack (stack with no elements). This results in an error and should be handled by checking if the stack is empty before performing…

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You can create an empty stack in Python using: stack = list() or stack = []. Since Python doesn't have a built-in stack data type, we use lists to implement stack functionality.

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def isEmpty(stack): if len(stack) == 0: return True else: return False Or simply: return len(stack) == 0…