I is for immutable - Python A to Z

Python A-Z is a blog series about Python. Each day, I share insights, ideas and examples for different parts of Python development that match with the letter of the day. Blaugust is an annual blogging festival in August where the goal is to write a blog post every day of the month. When we start learning programming, one of the first things we’re taught is a concept of variable. Variables are very handy: they store some data in memory, have a name you can use to refer to them later in the code and they can change. That’s what variable means. Merriam-Webster defines the word as able or apt to vary : subject to variation or changes A classic example is a counter that goes up. counter = 0 print(counter) # 0 counter = counter + 1 print(counter) # 1 counter = counter + 1 print(counter) # 2 counter = counter + 1 print(counter) # 3 Most of the early days, months or years of learning programming is about understanding this idea and a few related bits like different types (numbers, strings,…