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Functional Python Programming by Steven Lott

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Using the finite iterators

The itertools module provides a number of functions that we can use to produce finite sequences of values. We'll look at ten functions in this module, plus some related built-in functions:

  • enumerate(): This function is actually part of the __builtins__ package, but it works with an iterator and is very similar to other functions in the itertools module.
  • accumulate(): This function returns a sequence of reductions of the input iterable. It's a higher-order function and can do a variety of clever calculations.
  • chain(): This function combines multiple iterables serially.
  • groupby(): This function uses a function to decompose a single iterable into a sequence of iterables over subsets of the input data.
  • zip_longest(): This function ...

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