How do I disassemble a Python script from the command line?

Question

With gcc you can use -S to stop compilation after your code has been compiled into assembly. Is there a similar feature with Python/bytecode? I know of ways like:

import dis x = compile('print(1)', '', 'eval') dis.dis(x)

Which prints:

 1 0 LOAD_NAME 0 (print) 2 LOAD_CONST 0 (1) 4 CALL_FUNCTION 1 6 RETURN_VALUE

But I'm thinking of something more along the lines of:

> python3 -{SOME FLAG HERE} output my_script.py

Which outputs a file containing the scripts bytecode in a readable format.

"Which outputs a file containing the scripts bytecode in a readable format." so then you don't want the scripts bytecode, you want the output of the dissasembler? Because the bytecode is just bytes... — juanpa.arrivillaga
– juanpa.arrivillaga, Commented Nov 9, 2021 at 22:18
@juanpa.arrivillaga Thank you for clearing up the semantics for me, but yes. — 0x263A
– 0x263A, Commented Nov 9, 2021 at 22:24

juanpa.arrivillaga · Accepted Answer · 2021-11-09 22:25:11Z

If what you are looking for is the output of the disassembler, then you can run the module as a script:

python -m dis myscript.py

And the disassembler output will be printed to the standard output. You can use the appropriate shell tools to redirect that to some file. E.g. on *nix:

python -m dis myscript.py > output.txt

Caution: this use of dis is not documented as far as I am aware, and checking the source code it may not be a stable part of the module, but it does work for current CPython.

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