“Map” and “Filter” process sequences efficiently from "summary" of Fluent Python by Luciano Ramalho
The "map" function applies a function to each item in an iterable and returns an iterator that yields the results. By default, map creates a one-to-one mapping between the input iterable and the output iterable. However, you can pass multiple input iterables to map if the function takes multiple arguments. In that case, the mapping function must have as many arguments as there are input iterables. If you pass None as the first argument to map, the function returns tuples containing the items from the input iterables. This behavior is useful for combining data sources that have a natural one-to-one correspondence, such as pairs of coordinates or records from two related database tables. The "filter" function applies a function to each item in an iterable, yielding items for which the function returns True. Like map, filter returns an iterator. The function passed as the first argument to filter should return a boolean value. If the function is None, only it...
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