Python Stack смотреть онлайн

#python #coding #programming In Python, a "stack" is a type of data structure that follows the "last-in, first-out" (LIFO) principle. This means that the most recently added item is the first one to be removed. A stack is implemented using a list data type in Python.

The list is initialized to an empty list, and items can be added to the top of the stack using the "append" method. Items can be removed from the top of the stack using the "pop" method. Here's an example of how to create a stack and add some items to it:
stack = [ ]
stack.append(1)
stack.append(2)
stack.append(3)

In this example, we first initialize an empty list called "stack." We then add the numbers 1, 2, and 3 to the stack using the "append" method.

To remove an item from the stack, we can use the "pop" method. The "pop" method removes and returns the last item in the list (which, in this case, is the item at the top of the stack). Here's an example:

top_item = stack.pop()
print(top_item) # prints 3

In this example, we remove the top item from the stack using the "pop" method and store it in a variable called "top_item." We then print out the value of "top_item," which is 3.

We can also check the current size of the stack using the "len" method:
print(len(stack)) # prints 2

In this example, we print out the length of the stack (which is 2, since we removed one item from it earlier).

That's the basic idea behind a Python stack. It's a simple and useful data structure that can be used in a variety of contexts, from implementing a web server to processing data in scientific computing applications.
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