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The Hacker's Guide to Scaling Python

Disassembling Code

Explore how to use Python's dis module to disassemble code and understand bytecode instructions. Learn how this insight helps you identify inefficiencies, optimize loops, and avoid costly coding patterns, improving your application's performance.

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dis module

Sometimes, it helps to have a microscopic view of some part of the code. When that is the case, I find it better to rely on the dis module to find out what’s going on behind the scenes. The dis module is a disassembler for Python byte code. It is simple enough to use:

Python 3.8
import dis
def x():
    return 42
dis.dis(x)

The dis.dis function disassembles the function that you passed on as a parameter, and prints the list of bytecode instructions that are run by the function. It can be useful to understand what’s really behind each line ...