Say your file is stored in file ‘code.py’. Now, you can open the file, read all lines, get rid of leading and trailing whitespace characters, and store the result in a Python list in a single line of code. Here’s the code: Python is beautiful! ? Try it Yourself: Where to Go From Here? If … Read more
Problem: Given a list of strings. Sort the list of strings in alphabetical order. Example: Solution: Use the list.sort() method without argument to solve the list in lexicographical order which is a generalization of alphabetical order (also applies to the second, third, … characters). Try It Yourself: Related articles: The Ultimate Guide to Python Lists … Read more
Every computer scientist loves sorting things. In this article, I’ll show you how Python does it—and how you can tap into the powerful sorting features of Python lists. Definition and Usage: The list.sort() method sorts the list elements in place in an ascending manner. To customize the default sorting behavior, use the optional key argument … Read more
I stumbled across this question when browsing through StackOverflow and it got me thinking: what’s the best way to count the number of elements in a list that match a certain condition? Can you generalize this way to both general conditions (e.g. x>3) and regular expressions (e.g. ‘a.*’)? Short answer: you can count the number … Read more
This resource is meant to be the ultimate collection of Python One-Liners. If you have an idea for a one-liner to be published here, send me a message at chris (at) finxter.com. Find All Indices of an Element in a List Say, you want to do the same as the list.index(element) method but return all … Read more
This tutorial shows you everything you need to know to help you master the essential index() method of the most fundamental container data type in the Python programming language. Definition and Usage: The list.index(value) method returns the index of the value argument in the list. You can use optional start and stop arguments to limit … Read more
Do you want to plot numerical data? And do it in a beautiful, engaging, and scientifically sound way? And do all of this in a few simple lines of code? You’re in the right place! A great way to plot numerical data is the matplotlib boxplot. It displays the median, the interquartile range, and outliers … Read more
This tutorial shows you everything you need to know to help you master the essential count() method of the most fundamental container data type in the Python programming language. Definition and Usage: The list.count(x) method counts the number of occurrences of the element x in the list. Here’s a short example: In the first line … Read more
I have spent my morning hours on an important mission. What is the cleanest, fastest, and most concise answer to the following question: How do you find the key with the maximum value in a Python dictionary? Most answers on the web say you need to use a library but this is not true! Simply … Read more
COVID-19 is everywhere. In this article, I want to express my deep gratitude for the doctors, nurses, and medical personnel working 70-hours or more per week to mitigate the adverse effects of the virus. Here’s a pic of Finxter user Albrecht, a “retired” medical doctor supporting a COVID-19 test station in Germany: I asked the … Read more
In this tutorial, I’ll show you the difference of the regular expression quantifiers in Python. What’s the difference between the question mark quantifier (?), the plus quantifier (+), and the asterisk quantifier (*)? Say, you have regular expression pattern A. Regex A? matches zero or one occurrences of A. Regex A* matches zero or more … Read more
This tutorial shows you everything you need to know to help you master the essential reverse() method of the most fundamental container data type in the Python programming language. Definition and Usage: The list.reverse() reverses the order of the elements in the list. If you want to create a new list with reversed elements, use … Read more