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Arpit Bhayani Blogs
001 Ai Topological Sort

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TLDR: Python Internals - Exploring Chained Comparison Operators

Date: 2021-04-28 Source: https://arpitbhayani.me/blogs/chained-operators-python

Overview

Explore Python's chained comparisons (like a < b < c) and short-circuiting. Learn how they work under the hood and how to modify CPython! Python supports chaining of comparison operators, which means if we wanted to find out if b lies between a and c we can do a < b < c, making code super-intuitive.

Key Points

  • how Python evaluates chained comparison operators?
  • how Python implements short-circuiting?
  • how could you make Python-like evaluation a C-like evaluation? implying at the end of this essay we alter the CPython source code such that the expression -3 < -2 < -1
  • Evaluating 1 < 2 < 3: When we run disassembler on 1 < 2 < 3 we get a similar disassembled code.
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  • Short-circuit Evaluation: A very interesting instruction is sitting right in the middle - JUMP_IF_FALSE_OR_POP.
  • How does it “and” sub-expressions?: We have established and also seen in action how Python evaluates chained comparison operators.

    • Takeaway

    We have established and also seen in action how Python evaluates chained comparison operators.