Shadowing is when you have two separate variables with the same identifier. It is beyond obvious that all the x's refer to the same variable in dilap's example.

Shadowing is when you have two separate variables with the same identifier. It is beyond obvious that all the x's refer to the same variable in dilap's example. Contrast that with an actual example of shadowing[0], in which it is clear that the same identifier is being used to refer to two different variables. [0]: https://en.wikipedia.org/wiki/Variable_shadowing#Python https://en.wikipedia.org/wiki/Variable_shadowing#Python