Believe it or not—how you answer this question in your day-to-day code reveals your true Python skill level to every master coder who reads your code. Beginner coders check if a list a is empty using crude statements like len(a)==0 or a==[]. While those solve the problem—they check if a list is empty—they are not … Read more
Method 1: Iterating over Consecutive (Sliding) Windows Given are: Python list lst Window size n Problem Formulation: How to loop through the list in consecutive element-windows of size n, so that in each iteration, you can access the n next elements in the list? # INPUT: lst = [‘a’, ‘b’, ‘c’, ‘d’, ‘e’, ‘f’, ‘g’] … Read more
Download the cheat sheet here (direct PDF download): Have you ever asked yourself, “What does it mean to be a professional?” This article is about being a professional software developer. It is based on the book, Clean Code by Robert C. Martin. All quotations are from this book. While reading this article, you will learn … Read more
Python comes with many built-in functions you can use without importing a library. There are 64 of them. In this article, you’ll get an overview of the most important ones. For a full list of Python built-in functions, check out this resource. For a complete video tutorial course on Python’s built-in functions, check out this … Read more
Problem Formulation: Calling Parent Methods Given Parent class P Child class C that inherits from P Class method P.my_method() defined on the parent P Problem: Within a method of class C, how to call the parents method P.my_method()? Example: Consider the following example where you create a parent and a child class. You want to … Read more
Problem Formulation Given a Windows operating system on which you have the Microsoft Outlook email program installed. How to open Microsoft Outlook using only a function call in your Python script? Solution: os.startfile(‘outlook’) The easiest way to open Outlook on Windows using only a short and concise Python One-Liner is to use the os.startfile(‘outlook’) function … Read more
Tuples, Strings, and Lists Before we look at creating tuples, as a starting point it would be useful to clarify the meaning of the various terms we will be using throughout this article: A string is a sequence of characters, and represents one of the main Python data types. A list is used to store … Read more
✯ Overview Problem: Fixing TypeError: list indices must be integers or slices, not str in Python. Example: The following code lists a certain number of transactions entered by the user. Output: Solution: Please go through this solution only after you have gone through the scenarios mentioned below. Bugs like these can be really frustrating! ? But, … Read more
Problem Formulation: How to Remove a Directory in Python? The rm command in Linux removes a specific directory. You can also add the options -r remove the directory recursively -f ignore nonexistent files and arguments and don’t prompt the user to ask for confirmation So, if you run rm -rf my_directory, it’ll forcefully remove my_directory … Read more
[Reading time: 9 minutes] Graphs are everywhere. They are used in social networks, the world wide web, biological networks, semantic web, product recommendation engines, mapping services, blockchains, and Bitcoin flow analyses. Furthermore, they’re used to define the flow of computation of software programs, to represent communication networks in distributed systems, and to represent data relationships … Read more
Problem Formulation Given an integer number n. Given an initial string value s. How to create an array of n copies of s in Python? # Input: n = 5 s = ” # Output: [”, ”, ”, ”, ”] Method 1: List Multiplication Python doesn’t have a built-in array type. The equivalent of an … Read more
✯ Overview Problem: Fixing TypeError: Can’t Multiply Sequence by non-int of Type ‘float’ in Python. Example: Consider that you want to calculate the circumference of a circle using the radius entered by the user, as shown below. As you can see above, we encountered a TypeError while executing our code. Bugs like these can be … Read more