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A well-known easter egg in Python displays some ideas about writing good Python code, credited to Tim Peters (one of the core developers). This question is about the last:
Namespaces are one honking great idea -- let's do more of those!
It seems that the concept of a "namespace" appears in programming generally, not just in Python. Presumably this concept is important, given its inclusion here. However, it's hard to pin down a clear definition simply from considering its use in context. For example, I have seen a class
SimpleNamespace in the Python standard library; but it seems like the term is also used to describe things that are not actually objects in a program at runtime at all.
What exactly is a "namespace"? Does it refer to one specific concept that has particular properties regardless of the programming language? Or else how exactly should I understand it?