How to get python bytecode?

Question

I've tried using py_compile to get me some bytecode examples (for learning needs).

However, this is what I get

file.py:

print("hello world")

file.pyc:

 U

��Ob   �                   @   s   e d � dS )zhello worldN)�print� r   r   �test.py�<module>   �

I guess I'm doing something terribly wrong, but I have no clue.

My base script is

import py_compile

py_compile.compile('test.py')

You're printing binary data, so that's what it's supposed to look like... What else did you expect exactly? — Thierry Lathuille
– Thierry Lathuille, Commented Apr 8, 2022 at 8:34
Welcome to Stack Overflow. "I guess im doing something terribly wrong, but i have no clue." What do you think it should look like instead? Why? Also, what exactly are these "learning needs"? Also, you can get Python to compile any file by simply importing it as a module. — Karl Knechtel
– Karl Knechtel, Commented Apr 8, 2022 at 8:34
Did you expect to see the instruction names instead of bytecode? — Panagiotis Kanavos
– Panagiotis Kanavos, Commented Apr 8, 2022 at 8:34
@Thierry Lathuille Ty for all replies, i was away for a while, sorry. Main idea was to see by my own eyes the difference between lists and tuples for example. And i've read in Mark Lutc's book about the bytecode and i was sure that bytecode and binary data are different things. LIke bytecode goes to PVM and becomes binary. DIS is smething that is really what i was hoping to see. Thanks! — nachtblume
– nachtblume, Commented Apr 8, 2022 at 12:42

OTheDev · Accepted Answer · 2022-04-14 06:50:19Z

7

Are you looking for (the) dis module (documentation)?

Example:

>>> import dis
>>> def foo(a):
...   return a * a
... 
>>> dis.dis(foo)
  2           0 LOAD_FAST                0 (a)
              2 LOAD_FAST                0 (a)
              4 BINARY_MULTIPLY
              6 RETURN_VALUE

edited Apr 14, 2022 at 6:50

answered Apr 8, 2022 at 8:34

OTheDev

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1 Comment

Wolf Over a year ago

Some words about the relation between raw bytecode and the disassembled mnemonics would make this answer even better. The questioner and future readers seem to have difficulties to distinguish between both.

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