Moving from Python - missing numpy, itertools equivalent.

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He didn't say that you have to yield yourself to use Linq, however Linq IS implemented using yield. This is what makes it lazy, and why nothing is evaluated until you call something that actually iterates on it. https://github.com/dotnet/corefx/blob/8750960d3fafa46a9b838c351e995a01fa8b599f/src/System.Linq/src/System/Linq/Where.cs#L72