Stacks

A stack is like a stack of plates. It's "last in, first out" (LIFO), which means the item that was put in the stack most recently is the first item that comes out.

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Stacks have two main methods:

  1. push adds an item
  2. pop removes and returns the top item

They can also include some utility methods:

  1. peek returns the item on the top of the stack, without removing it.
  2. is_empty returns True if the stack is empty, False otherwise

See also:

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