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Python FTW: Under the Hood

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1.Introduction

Overview How to Best Use This Course

2.Slippery Slopes

Stubborn del Operation The Out of Scope Variable Deleting a List Item While Iterating A Tic-tac-toe Where X Wins in the First Attempt!Lossy Zip of Iterators Loop Variables Leaking Out!Modifying the Dictionary While Iterating Over It Challenge 1: Sudoku Solution Review: Sudoku Name Resolution Ignoring Class Scope Beware of Default Mutable Arguments!Catching the Exceptions Same Operands, Different Story!Can I Call You Later?What's Wrong With Booleans?Class Attributes and Instance Attributes Quick Quiz!Splitsies Wild Imports Let's Mangle All Sorted?Midnight Doesn't Exist?Needles in a Haystack More Needles in the Haystack Quick Quiz!Challenge 2: Updating Outer Scope Values Solution Review: Updating Outer Scope Values Challenge 3: Updating Outer Scope Values Again Solution Review: Updating Outer Scope Values Again Quick Recap

3.Strain Your Brain!

First Things First!Strings Can Be Tricky Sometimes Be Careful With Chained Operations How Not to Use the "is" Operator Hash Brownies Deep Down, We're All the Same Disorder Within Order Keep Trying...For What?Quick Quiz!Evaluation Time Discrepancy 'is not... ' Is Not 'is (not ...)'The Chicken and Egg Problem Subclass Relationships All-true-ation The Surprising Comma Strings and the Backslashes Not Knot!Half Triple-quoted Strings Quick Quiz!The Mysterious Key Type Conversion Non-Reflexive Class Method Yielding None Yielding From...Return!Nan-reflexivity Mutating the Immutable!The Disappearing Variable From Outer Scope Let's See If You Can Guess This?Quick Quiz!Quick Recap

4.Appearances Are Deceptive!

Skipping Lines?Teleportation Well, Something Is Fishy...Quick Recap

5.The Hidden Treasures!

Okay Python, Can You Make Me Fly?'goto', but Why?Brace Yourself!Let's Meet Friendly Language Uncle for Life Even Python Understands That Love Is Complicated Yes, It Exists!Ellipsis Inpinity Quick Quiz!Quick Recap

6.Miscellaneous

'+=' Is Faster Let's Make a Giant String!Slowing Down dict Lookups Bloating Instance dicts Minor Ones More of These This is the End Quick Quiz!Quick Recap

7.Contributions & Acknowledgements

Contributing Acknowledgements

Python FTW: Under the Hood

'goto', but Why?

We'll cover the following...

Where are we going?

⚠️ The following code is meant for Python 2.3.

Python

from goto import goto, label
for i in range(9):
    for j in range(9):
        for k in range(9):
            print("I am trapped, please rescue!")
            if k == 2:
                goto .breakout # breaking out from a deeply nested loop
label .breakout
print("Freedom!")

Output

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