Chris
YouTube is a great way of learning Python. But those channels top all others. In this article, you’ll find a list of the top YouTube Channels — in reverse order! Corey Schäfer #6 Channel link: https://www.youtube.com/user/schafer5/ 37,444,096 channel views Channel Description: This channel is focused on creating tutorials and walkthroughs for software developers, programmers, and … Read more
Want to create your own webserver in a single line of Python code? No problem, just use this command in your shell: The terminal will tell you: To shut down your webserver, kill the Python program with CTRL+c. This works if you’ve Python 3 installed on your system. To check your version, use the command … Read more
Python’s Tilde ~n operator is the bitwise negation operator: it takes the number n as binary number and “flips” all bits 0 to 1 and 1 to 0 to obtain the complement binary number. For example, the tilde operation ~1 becomes 0 and ~0 becomes 1 and ~101 becomes 010. Read all about the Tilde … Read more
Yes, the dot regex matches whitespace characters when using Python’s re module. Consider the following example: Try it yourself in our interactive Python shell (click “run”): The dot matches all characters in the string–including whitespaces. You can see that there are many whitespace characters ‘ ‘ among the matched characters. Need more info? Watch the … Read more
To add an element to a given Python list, you can use either of the three following methods: Use the list insert method list.insert(index, element). Use slice assignment lst[index:index] = [element] to overwrite the empty slice with a list of one element. Use list concatenation with slicing lst[:2] + [‘Alice’] + lst[2:] to create a … Read more
You’ve probably landed on this article because you’re working on a code project with textual data that has some leading or trailing whitespaces. There’s only one question you want to be answered: How to get rid of those whitespaces? So without wasting any more of your time, let’s get to the core! How to Trim … Read more
List comprehension is a compact way of creating lists. The simple formula is [expression + context]. Expression: What to do with each list element? Context: What elements to select? The context consists of an arbitrary number of for and if statements. The example [x for x in range(3)] creates the list [0, 1, 2]. Being … Read more
I just got invited to perform Google’s FooBar challenge. In this article, I want to share with you how I solved the problems in real-time. The purpose of this article is to educate you—and to have some fun. So, are you ready? Level 1: Prime Numbers The first goal was to find an identifier for … Read more
Short answer: To find the minimal list in a list of lists, you need to make two lists comparable. How? With the key argument of the min() function. The key argument is a function that takes one input (a list) and returns one output (a numerical value). The list with the smallest numerical value is … Read more
How to check if a Python string s1 contains another string s2? There are two easy ways to check whether string s1 contains string s2: You can try both methods in our interactive Python shell (just click “Run” to execute the code in your browser): Puzzle: Can you modify “Method 2” so that it also … Read more
Short answer: To find the maximal list in a list of lists, you need to make two lists comparable. How? With the key argument of the max() function. The key argument is a function that takes one input (a list) and returns one output (a numerical value). The list with the largest numerical value is … Read more
The Python backslash (‘\’) is a special character that’s used for two purposes: Try it yourself in our interactive Python shell (just click “Run”): The backslash \ is an escape character–if used in front of another character, it changes the meaning of this character. For example, the character ‘n’ is just that a simple character, … Read more