Delve into Python's hidden mechanisms and discover essential tools and tricks to avoid common mistakes. Gain insights into Python hacks and improve your programming skills effortlessly.

python.tar.gz

python3.8

python2.3

python3.7

python3.6

python3.5

SPA_Job

When you run code in Python, there’s a lot happening under the hood. This course sheds light on some of the interesting parts of Python you might be unaware of. 

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 the course 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

Where does Christmas come before Thanksgiving?

In the dictionary. Okay, I will see myself out now. 

> ⚠️ The following code is meant for **Python 2.7 - 3.5** versions.

x = {0: None}

for i in x:
    del x[i]
    x[i+1] = None
    print(i)

The code runs exactly **eight** times, then stops.


<h1> Explanation </h1>

* Iteration over a dictionary that you edit at the same time is not supported.
* It runs eight times because that's the point at which the dictionary resizes to hold more keys (we have eight deletion entries, so a resize is needed). This is actually an implementation detail.
* How deleted keys are handled and when the resize occurs might be different for different Python implementations.

Introduction

Slippery Slopes

Strain Your Brain!

Appearances Are Deceptive!

The Hidden Treasures!

Miscellaneous

Contributions & Acknowledgements

Modifying the Dictionary While Iterating Over It