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Functional Python Programming, 3rd edition

Functional Python Programming, 3rd edition

By : Steven F. Lott
4.5 (28)
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Functional Python Programming, 3rd edition

Functional Python Programming, 3rd edition

4.5 (28)
By: Steven F. Lott

Overview of this book

Not enough developers understand the benefits of functional programming, or even what it is. Author Steven Lott demystifies the approach, teaching you how to improve the way you code in Python and make gains in memory use and performance. If you’re a leetcoder preparing for coding interviews, this book is for you. Starting from the fundamentals, this book shows you how to apply functional thinking and techniques in a range of scenarios, with Python 3.10+ examples focused on mathematical and statistical algorithms, data cleaning, and exploratory data analysis. You'll learn how to use generator expressions, list comprehensions, and decorators to your advantage. You don't have to abandon object-oriented design completely, though – you'll also see how Python's native object orientation is used in conjunction with functional programming techniques. By the end of this book, you'll be well-versed in the essential functional programming features of Python and understand why and when functional thinking helps. You'll also have all the tools you need to pursue any additional functional topics that are not part of the Python language.
Table of Contents (18 chapters)
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Preface
16
Other Books You Might Enjoy
17
Index

10.5 Reducing sets of data with the reduce() function

The sum(), len(), max(), and min() functions are, in a way, all specializations of a more general algorithm expressed by the reduce() function. See Chapter 5, Higher-Order Functions for more on these functions. The reduce() function is a higher-order function that folds a binary operation into each pair of items in an iterable.

A sequence object is given as follows:

>>> d = [2, 4, 4, 4, 5, 5, 7, 9]

The expression reduce(lambda x, y: x+y, d) will fold in + operators to the list as if we were evaluating the following:

>>> from functools import reduce 
 
>>> reduce(lambda x, y: x+y, d) 
40 
>>> 2+4+4+4+5+5+7+9 
40

It can help to include () to show the effective left-to-right grouping as follows:

>>> ((((((2+4)+4)+4)+5)+5)+7)+9 
40

Python’s standard interpretation of expressions involves a left-to-right evaluation...

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