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Functional Python Programming

Functional Python Programming

By : Steven F. Lott
4 (9)
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Functional Python Programming

Functional Python Programming

4 (9)
By: Steven F. Lott

Overview of this book

This book is for developers who want to use Python to write programs that lean heavily on functional programming design patterns. You should be comfortable with Python programming, but no knowledge of functional programming paradigms is needed.
Table of Contents (18 chapters)
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17
Index

Starmapping with operators

The itertools.starmap() function can be applied to an operator and a sequence of pairs of values. Here's an example:

>>> d= starmap(pow, zip_longest([], range(4), fillvalue=60))

The itertools.zip_longest() function will create a sequence of pairs such as the following:

[(60, 0), (60, 1), (60, 2), (60, 3)]

It does this because we provided two sequences: the [] brackets and the range(4) parameter. The fillvalue parameter will be used when the shorter sequence runs out of data.

When we use the starmap() function, each pair becomes the argument to the given function. In this case, we provided the operator.pow() function, which is the ** operator. We've calculated values for [60**0, 60**1, 60**2, 60**3]. The value of the d variable is [1, 60, 3600, 216000].

The starmap() function is useful when we have a sequence of tuples. We have a tidy equivalence between the map(f, x, y) and starmap(f, zip(x,y)) functions.

Here's a continuation of the preceding...

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