Description

Lets an object alter its behavior when its internal state changes. It appears as if the object changed its class.

Where to use

• Workflow engines.
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• TCP Connections.
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• Game Character States.

Real World Example

A Phone. If 'Unlocked', pressing buttons calls numbers. If 'Locked', pressing buttons turns on the screen.

Code Example

class State:
    def __init__(self):
        pass

    def execute(self):
        print('Executing State')