Generators for Engineers

A gentle introduction to infinite sequences.

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If you've heard of the itertools module, feel free to skip this section. If you do not already love itertools, read this. Itertools provides high level operations for infinite lists. There are also a bunch of awesome mathy parts, such as itertools.combinations() and itertools.permutations(). We'll be using tee(), islice() and count(). count() is pretty simple. It acts like xrange(0, infinity). You can specify any starting point, but it will always keep on counting up. islice() is a bit more tricky. It has similar semantics to slice(), where slice() is the underlying function to Python's list[start:stop:interval] notation. All these snippets do the same thing, produce even numbers between 4 and 16.

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