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Arpit Bhayani Blogs
001 Ai Topological Sort

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TLDR: Python Internals - I Made Addition Unpredictable

Date: 2020-01-03 Source: https://arpitbhayani.me/blogs/i-changed-my-python

Overview

Explore Python internals by tweaking its source code! Learn how I made addition unpredictable and the challenges I faced. For checking if both the operands for BINARY_ADD operation are numbers I used the predefined function named PyNumber_Check which checks if object referenced by PyObject is number or not.

Key Points

  • Checking if operands are numbers: For checking if both the operands for BINARY_ADD operation are numbers I used the predefined function named PyNumber_Check which checks if object referenced by PyObject is number or not.
  • Did you ever take a peek at Python’s source code?
  • I didn’t and hence I decided to have some fun with it this week.
  • After cloning the repository I realized how well written is the code that makes python what it is.
  • In the process of exploring the codebase, I thought of making some changes, not big optimizations but some minor tweaks that will help me understand how Python is implemented in C and along the course learn some internals.
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  • To make things fun and interesting I thought of changing how addition work by making it incorrect and unpredictable which means a + b will internally do one of the following operations, at random

    • Takeaway

    For checking if both the operands for BINARY_ADD operation are numbers I used the predefined function named PyNumber_Check which checks if object referenced by PyObject is number or not.