Problem: How to return from a Python function or method in single line? Example: Consider the following “goal” statement: However, this leads to a Syntax error: In this tutorial, you’ll learn how to write the return statement with an if expression in a single line of Python code. You can get an overview of the …
Summary: To make a Python one-liner out of any multi-line Python script, replace the new lines with a new line character ‘\n’ and pass the result into the exec(…) function. You can run this script from the outside (command line, shell, terminal) by using the command python -c “exec(…)”. Problem: Given a multi-line code script …
How to Execute Multiple Lines in a Single Line Python From Command-Line? Read More »
Summary: You can accomplish one line exception handling with the exec() workaround by passing the one-linerized try/except block as a string into the function like this: exec(‘try:print(x)\nexcept:print(“Exception!”)’). This general method works for all custom, even multi-line, try and except blocks. However, you should avoid this one-liner code due to the bad readability. Surprisingly, there has …
The with statement replaces former try…finally blocks in Python. It ensures that clean-up code is executed. For example, it closes open files before leaving the block. Consider this code example (assuming this code is stored in a file named ‘code.py’): The output of this code would be the code itself (for nerds: a piece of …
Most computer scientists, programmers, and hackers don’t even know the meaning of the word “Quine” in the context of programming. So, first things first: What is a Quine? Roughly speaking, a quine is a self-reproducing program: if you run it, it generates itself. Here’s a great definition: :quine: /kwi:n/ /n./ [from the name of the …
Python is powerful — you can condense many algorithms into a single line of Python code. So the natural question arises: can you write a while loop in a single line of code? This article explores this mission-critical question in all detail. How to Write a While Loop in a Single Line of Python Code? …
Problem: Given a collection. You want to create a new list based on all values in this collection. The code should run in a single line of code. How do you accomplish this? Do you need a lambda function? Example: Given an array a = [1, 2, 3, 4]. You need to create a second …
This tutorial will teach you how to write one-line for loops in Python using the popular expert feature of list comprehension. After you’ve learned the basics of list comprehension, you’ll learn how to restrict list comprehensions so that you can write custom filters quickly and effectively. Are you ready? Let’s roll up your sleeves and …
Python is powerful — you can condense many algorithms into a single line of Python code. So the natural question arises: can you write a for loop in a single line of code? This article explores this mission-critical question in all detail. How to Write a For Loop in a Single Line of Python Code? …
Summary: The most Pythonic way to define a function in a single line is to (1) create an anonymous lambda function and (2) assign the function object to a variable name. You can then call the function by name just like any other regularly-defined function. For example, the statement f = lambda x: x+1 creates …
3 (Not So) Pythonic Ways to Define a Function in One Line [for Hackers] Read More »
Crafting beautiful Python one-liners is as much an art as it is a science. In this tutorial, you’ll learn how to compress an if statement without an else branch into a single line of Python code. Problem: What’s the one-liner equivalent of the simple if statement without an else branch? Here’s an example: You may …
Problem: Given a string and a filename. How to write the string into the file with filename using only a single line of Python code? Example: You have filename ‘hello.txt’ and you want to write string ‘hello world!’ into the file. How to achieve this? In this tutorial, you’ll learn four ways of doing it …