Python stories, August 2018

I'm running @pythonetc, a Telegram channel about Python and programming in general. Here are the best posts of August 2018.Factory methodIf you create new objects inside your __init__, it may be better to pass them as arguments and have a factory method instead. It separates business logic from technical details on how objects are created.In this example __init__ accepts host and port to construct a database connection:class Query: def __init__(self, host, port): self._connection = Connection(host, port)The possible refactoring is:class Query: def __init__(self, connection): self._connection = connection @classmethod def create(cls, host, port): return cls(Connection(host, port))This approach has at least these advantages:It makes dependency injection easy. You can do Query(FakeConnection()) in your tests.The class can have as many factory methods as needed; the connection may be constructed not only by host and port but also by cloning another connection, reading a config file or object, using the default, etc.

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metaprogramming,oop,software-architecture,software-development,python