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lang-py
method injection...as if we already had less of estoric terms coined for every quirk of code structure. Anyhow, in simplest terms: The dependencies that stay same for lifetime of an object should ideally be passed via constructor, while the dependencies that are local per method usage, should be provided as method parameters, together.TextWriterclass. Suppose I'm building a big system that uses aTextWriter. You're offering two choices; Either (a) the code site that constructs theTextWriteris responsible to decide where/how the text should be saved, or (b) the site that knows when to save must accept that responsibility. Those two sites could be far from each other in an architecture diagram, It's two different ways of thinking about whatTextWriterdoes. IMO (a) feels like it should be called DI, but (b) does not.