Connascence in Python: the 9 types of coupling explained
Coupling is often treated as a vague notion: “it’s too coupled” says nothing about what to actually change. Connascence provides a precise vocabulary to name the different forms of coupling, compare them, and decide which ones to reduce first. The concept is documented in detail at connascence.io. Three axes to evaluate connascence Every instance of connascence can be analyzed along three axes: Strength: the stronger a connascence, the harder it is to detect and refactor. Degree: an entity coupled to hundreds of others is more problematic than one coupled to two. Locality: two components that are close together (same class, same module) can tolerate stronger forms. At a distance, those same forms become dangerous. The 9 types of connascence Connascence of Name (CoN) Multiple components agree on the name of an entity. This is the weakest and most unavoidable form. ...