Learn some Python tools and tricks to avoid common mistakes.

Pythonic Style of Programming: Tips and Tricks

When you run code in Python, there’s a lot happening under the hood. This module sheds light on some of the lesser-known parts of Python.

As you progress through it, you’ll learn some tools and tricks that every Python programmer should know to avoid common mistakes. You can think of this module as a “Python hacks” handbook.

Python basics are a prerequisite, but this is a beginner-level course. Each lesson is independent and after the first chapter, you can pick up from any lesson, and you’ll be able to follow along comfortably.

Python FTW: Under the Hood

Let's look at the solution to the challenge in the previous lesson.

<h2> Solution </h2>

#var = 9

def update_var(value):
  global var
  var = value
  return var
  

print(update_var(6))
print(var)

python3.8

<h2> Explanation </h2>

- While we can access global variables without the `global` keyword, but to reassign their values, we have to use the `global` keyword. 
- The `global` keyword marks the scope of the referred variable as global, so even if the variable referred to in the global statement doesn’t exist, it will get created in the global scope when we assign it some value locally. The following code snippets demonstrate this process:




Introduction

Slippery Slopes

Strain Your Brain!

Appearances Are Deceptive!

The Hidden Treasures!

Miscellaneous

Conclusion

Solution Review: Updating Outer Scope Values

Solution

Explanation