Stack Overflow is full of questions where the answer is to create a "multidict", a dict mapping each key to a list of values.

There are two ways to do this, using defaultdict, or using a regular dict with setdefault.

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The problem

Often, using an iterator lazily is better than generating a sequence (like the one you get from a list comprehension).

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A lot of people—not just novices—mix up parameters and arguments, especially when it comes to things like how default-valued parameters and keyword arguments, or argument unpacking and variable parameters.

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How grouper works

A very common question on StackOverflow is: "How do I split a sequence into evenly-sized chunks?"

If it's actually a sequence, rather than an arbitrary iterable, you can do this with slicing.

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