python-dependency-injector/examples/di_demo/example_di.py

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"""The Code, that demonstrates dependency injection pattern."""
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class Service:
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"""Some "Service"."""
class Client:
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"""Some "Client" that uses "Service"."""
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def __init__(self, service): # Service instance is injected into Client
"""Initialize instance."""
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self.service = service
if __name__ == '__main__':
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service = Service() # Application creates Service instance
client = Client(service) # and inject Service instance into the Client