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.

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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

Let me show you a small magic trick, performed with the Python dictionaries.


class SomeClass(str):
    pass

some_string = 's'
some_dict = {some_string: 42}

print(some_dict.keys())

some_instance = SomeClass('s')
some_dict[some_instance] = 40
print(some_string is some_instance)
print(some_dict) # expected: Two different keys-value pairs

print(some_dict.keys())

<h1> Explanation </h1>

* This example is somewhat similar to the "Hash Brownies" example.
* Both the object `s` and the string `"s"` hash to the same value because `SomeClass` inherits the `__hash__` method of the `str` class.
* `SomeClass("s") == "s"` evaluates to `True` because `SomeClass` also inherits the `__eq__` method from `str` class.
* Since both objects hash to the same value and are equal, they are represented by the same key in the dictionary.
* For the desired behavior, we can redefine the `__eq__` method in `SomeClass`.
 

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![](/api/collection/10370001/6322201797066752/page/4797812261781504/image/5287888561373184)

Introduction

Slippery Slopes

Strain Your Brain!

Appearances Are Deceptive!

The Hidden Treasures!

Miscellaneous

Contributions & Acknowledgements

The Mysterious Key Type Conversion