Problem: How to perform one-line if conditional assignments in Python?
Example: Say, you start with the following code.
x = 2 boo = True
You want to set the value of x to 42 if boo is True , and do nothing otherwise.
Let’s dive into the different ways to accomplish this in Python. We start with an overview:
Exercise: Run the code. Are all outputs the same?
Next, you’ll dive into each of those methods and boost your one-liner superpower!
The most basic ternary operator x if c else y returns expression x if the Boolean expression c evaluates to True . Otherwise, if the expression c evaluates to False , the ternary operator returns the alternative expression y .
if else
A shorthand form of the ternary operator is the following tuple syntax.
Syntax: You can use the tuple syntax (x, y)[c] consisting of a tuple (x, y) and a condition c enclosed in a square bracket. Here’s a more intuitive way to represent this tuple syntax.
Python One-Liners will teach you how to read and write “one-liners”: concise statements of useful functionality packed into a single line of code. You’ll learn how to systematically unpack and understand any line of Python code, and write eloquent, powerfully compressed Python like an expert.
The book’s five chapters cover (1) tips and tricks, (2) regular expressions, (3) machine learning, (4) core data science topics, and (5) useful algorithms.
Detailed explanations of one-liners introduce key computer science concepts and boost your coding and analytical skills. You’ll learn about advanced Python features such as list comprehension, slicing, lambda functions, regular expressions, map and reduce functions, and slice assignments.
You’ll also learn how to:
By the end of the book, you’ll know how to write Python at its most refined, and create concise, beautiful pieces of “Python art” in merely a single line.
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