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Creating and calling functions were briefly introduced back in an earlier lesson, so the goal of this lesson is to fill in more of the gaps as well as introducing other features of functions and functional programming found in Python. In particular, a good amount of time is spent on features that focus on functions arguments/parameters, i.e., keyword arguments, default values, return values, calling convention applicability in Python, etc. The remainder of the lesson covers variable scope, namespaces, functional programmings, anonymous functions, variable arguments, and finally, argument grouping.