はてなブックマーク

Note: This post was originally titled “Stop writing lambda expressions in Python” but I’ve changed the title after deciding that it was a little too extreme. It’s hard for me to teach an in-depth Python class without discussing lambda expressions. I almost always get questions about them. My students tend to see them in code on StackOverflow or they see them in a coworker’s code (which, realistica

Whether I’m teaching new Pythonistas or long-time Python programmers, I frequently find that Python programmers underutilize multiple assignment. Multiple assignment (also known as tuple unpacking or iterable unpacking) allows you to assign multiple variables at the same time in one line of code. This feature often seems simple after you’ve learned about it, but it can be tricky to recall multiple

Sometimes the Pythonic way to solve a problem changes over time. As Python has evolved, so has the Pythonic way to count list items. Let’s look at different techniques for counting the number of times things appear in a list. While analyzing these techniques, we will only be looking at code style. We’ll worry about performance later. We will need some historical context to understand these differe