Using classes

• To create an instance, simply call the class object:

  x = Stack()
  

• To use methods of the instance, call using dot notation:

  x.empty() # -> 1
  
  x.push(1) # [1]
  x.empty() # -> 0
  x.push("hello") # [1, "hello"]
  x.pop() # -> "hello" # [1]

• To inspect instance variables, use dot notation:

  x.items # -> [1]
  

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