String slicing is a concept to carve out a substring from a given string. Use slicing notation s[start:stop:step] to access every step-th element starting from index start (included) and ending in index stop (excluded). All three arguments are optional, so you can skip them to use the default values (start=0, stop=len(string), step=1). For example, the … Read more
Python’s built-in function classmethod() prefixes a method definition in a class as an annotation @classmethod. This annotation transforms a normal instance method into a class method. The difference between class and instance method is that Python passes the class itself as a first implicit argument of the method rather than the instance on which it … Read more
An arbitrary argument list is a Python feature to call a function with an arbitrary number of arguments. It’s based on the asterisk “unpacking” operator *. To catch an arbitrary number of function arguments in a tuple args, use the asterisk syntax *args within your function definition. For example, the function def f(*args): … allows … Read more
The most pythonic way to convert a list of integers fs to a list of floats is to use the one-line fs = [float(x) for x in fs]. It iterates over all the elements in the list fs using list comprehension and converts each element of the list x to an integer value using the … Read more
Challenge: Given is function f. How to assign the function to variable g, so that you can call g() and it runs function f()? Your desired output is function f‘s output: How to accomplish this in the most Pythonic way? Overview: We examine two methods to accomplish this challenge. You can run them in our … Read more
Are you trying to understand how to call Python code from Tableau? Maybe you tried other online resources but ran into frustrating errors. This TabPy tutorial will show you how to get the TabPy installed and setup, and will get you running Python code in Tableau. Installing Tableau Desktop If you need Tableau Desktop, you … Read more
If you learn Python with the excellent Sololearn app, you may find yourself with this code snippet: What’s the output of this code snippet? And, most importantly, how does it work? This short guide will tell you! The code creates a function that returns x^y. It leverages the important programming concept of recursion: it calls … Read more
The Python range() function creates an iterable of subsequent integers within a given range of values. You can pass either only a stop argument in which case the range object will include all integers from 0 to stop (excluded). Or you can pass start, stop, and step arguments in which case the range object will … Read more
Python slicing means to access a subsequence of a sequence type using the notation [start:end]. A little-known feature of slicing is that it has robust end indices. Slicing is robust even if the end index is greater than the maximal sequence index. The slice just takes all elements up to the maximal element. If the … Read more
When I first saw this, I was sure it’s a bug. Well—it’s a feature! In today’s short article, you’ll learn about a small Python trick that I call “string concatenation without +”. Let’s start with some code! Plus vs. Adjacent String Literal Concatenation There are two ways to concatenate string literals in Python: Using the … Read more
The Python chr() function takes one number as argument that is the specified Unicode and returns the character associated to this Unicode argument. For example, the call chr(101) returns the Unicode character ‘e’. The allowed range of arguments are all integers between 0 and 1,114,111 (included)—integers outside this interval will raise a ValueError. Here are … Read more
Python has powerful built-in capabilities for string manipulation. That’s why web companies like Google love Python—it’s a perfect fit for the text-based web. This guide shows you how to use string concatenation operators using multiple forms of education: Text Puzzle Video Exercise Ready to learn string concatenation? Let’s get started! A Textual Introduction to String … Read more