The list methods make it very easy to use a list as a stack, where the last element added is the first element retrieved (“last-in, first-out”). To add an item to the top of the stack, use append(). To retrieve an item from the top of the stack, use pop() without an explicit index.
Question
The list methods make it very easy to use a list as a stack, where the last element added is the first element retrieved (“last-in, first-out”). To add an item to the top of the stack, use append(). To retrieve an item from the top of the stack, use pop() without an explicit index.
Solution
The methods of the list in Python make it very easy to use a list as a stack, where the last element added is the first element retrieved ("last-in, first-out"). To add an item to the top of the stack, you can use the append() method. This method adds an item to the end of the list. Here is an example:
stack = []
stack.append('a')
stack.append('b')
stack.append('c')
print(stack)
The output will be ['a', 'b', 'c'].
To retrieve an item from the top of the stack, you can use the pop() method without an explicit index. The pop() method removes the last item in the list and returns it. Here is an example:
item = stack.pop()
print(item)
print(stack)
The output will be 'c' and ['a', 'b']. As you can see, the last item added ('c') was the first one to be retrieved, which is the behavior of a stack.
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28. What is the purpose of the append() method in Python lists? A) To insert an element at a specific position in the list B) To remove the first occurrence of an element from the list C) To add an element to the end of the list D) To reverse the order of the elements in the list 29. Which of the following is the correct way to access the last element of a list in Python? A) list[-1] B) list[0] C) list[len(list)] D) list[1] 30. What is the main difference between a list and a tuple in Python? A) A list is mutable while a tuple is immutable B) A tuple is mutable while a list is immutable C) A list can contain elements of different data types while a tuple can only contain elements of the same data type D) A tuple can contain elements of different data types while a list can only contain elements of the same data type
What is a stack in Python?OptionsA data structure that allows the elements to be inserted and removed from any positionA data structure that follows the order of the elements as they were addedA linear data structure that uses a First-In-Last-Out (FILO) or Last-In-First-Out (LIFO) approachA collection of elements that can be accessed using an index
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