What is a stack in Python's collections module?

Can you explain what a stack is in Python's collections module?

Sure! A stack is a data structure that follows the Last In, First Out (LIFO) principle. In Python, you can use lists or the collections.deque class to implement a stack.

How do I add and remove items from a stack?

You can use the append() method to add items to the top of the stack and the pop() method to remove the top item.

Can you give me a code example?

Of course! Here's a simple example:

stack = []
stack.append(1)  # Add 1 to the stack
stack.append(2)  # Add 2 to the stack
print(stack)     # Output: [1, 2]
stack.pop()      # Removes 2
print(stack)     # Output: [1]

What are some use cases for stacks?

Stacks are commonly used in scenarios like undo mechanisms in applications, parsing expressions, and managing function calls.