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

Want to hear a joke? Sorry, humor is out of the scope of this course. 

a = 1
def some_func():
    print(a)

def another_func():
    a += 1
    print(a)

some_func()
another_func()

<h1> Explanation </h1>

* When you make an assignment to a variable in scope, it becomes local to that scope. So `a` becomes local to the scope of `another_func`,  but it has not been initialized previously in the same scope, which throws an error.
* Read [this](http://sebastianraschka.com/Articles/2014_python_scope_and_namespaces.html) short but an awesome guide to learn more about how namespaces and scope resolutions work in Python.
* To modify the outer scope variable `a` in `another_func`, use the `global` keyword.
 

# Explanation

* When you make an assignment to a variable in scope, it becomes local to that scope. So `a` becomes local to the scope of `another_func`,  but it has not been initialized previously in the same scope, which throws an error.
* Read [this](http://sebastianraschka.com/Articles/2014_python_scope_and_namespaces.html) short but an awesome guide to learn more about how namespaces and scope resolutions work in Python.
* To modify the outer scope variable `a` in `another_func`, use the `global` keyword.
 

Introduction

Slippery Slopes

Strain Your Brain!

Appearances Are Deceptive!

The Hidden Treasures!

Miscellaneous

Conclusion

The Out of Scope Variable

Explanation