A generator function is a Pythonic way to create an iterable without explicitly storing it in memory. This reduces memory usage of your code without incurring any additional costs. The following code shows a function get_numbers(n) that returns a list of n random numbers. However, this is not very efficient code because you create a … Read more
Problem: How to match dollar amounts in a given string? If cent amounts are given, those should match as well. Solution: You can use regular expression pattern ‘(\$[0-9]+(.[0-9]+)?)’ to find all numbers that start with a dollar symbol, followed by an arbitrary number of numerical digits, followed by an optional decimal point and an arbitrary … Read more
To update a global variable in one line of Python, retrieve the global variable dictionary with the globals() function, and access the variable by passing the variable name as a string key such as globals()[‘variable’]. Then overwrite the global variable using the equal symbol, for example in globals()[‘variable’] = 42 to overwrite the variable with … Read more
Wouldn’t reading code be much easier if the author constantly shared their thoughts with you? Commenting is good practice in Python because it helps others (and your future self) understanding your code much better. Writing commented code makes you more productive in the long term! There are two types of comments: one-line comments and multi-line … Read more
Do you hate those lengthy class definitions with __init__ and too many whitespaces and newlines? Python One-Liners to the rescue! Luckily, you can create classes in a single line—and it can even be Pythonic to do so! Sounds too good to be true? Let’s dive right into it! Problem: How to create a Python class … Read more
In this article, you’ll learn about two variants of this problem. Assign multiple values to multiple variables Assign the same value to multiple variables Let’s have a quick overview of both in our interactive code shell: Exercise: Increase the number of variables to 3 and create a new one-liner! Let’s dive into the two subtopics … Read more
The single line of Python code is more powerful than you may expect. In fact, you can compress whole algorithms in a single line of Python code. In this tutorial, you’ll learn how to use the built-in map() function in Python to one-linerize a critical step that would otherwise take multiple lines of Python code: … Read more
A docstring describes a module, function, class, or method in plain English to help other coders understand the meaning better. You must define the docstring at the beginning of the module, function, class, or method definition. By doing so, the docstring becomes the __doc__ special attribute of that object. You can access the docstring of … Read more
You may already know about Python’s capability to create a simple web server in a single line of Python code. Old news. Besides, what’s the point of creating a webserver that only runs on your machine? It would be far more interesting to learn how to access existing websites in a single line of code. … Read more
The “hello world program” is used in programming languages to set up a minimal programming environment and execute the first trivial program in it. It helps you get your environment going and take your first steps towards a more complicated program. This short tutorial will show you the fastest possible way to write your first … Read more
The FizzBuzz problem is a common exercise posed in code interviews to test your proficiency in writing simple Python code. Problem: Print all numbers from 1-100 to the shell with three exceptions: For each number divisible by three you print “Fizz”, For each number divisible by five you print “Buzz”, and For each number divisible … Read more
A lambda function allows you to define a function in a single line. It starts with the keyword lambda, followed by a comma-separated list of zero or more arguments, followed by the colon and the return expression. For example, lambda x, y: x+y calculates the sum of the two argument values x+y in one line … Read more