Is it possible to execute Python bytecode with a script?

Question

Say I have a CPython session running,

Is there a way to run data ( bytes) from a file pycdirectly? (without the need for data on disk and without the need to write a temporary pyc file)

Sample script to show a simple usage example:

if foo:
    data = read_data_from_somewhere()
else:
    data = open("bar.pyc", 'rb').read()

assert(type(data) is bytes)

code = bytes_to_code(data)

# call a method from the loaded code
code.call_function()

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Accurate use is not important, but generating the code dynamically and copying it over the network for execution is one use case (in order to think about this issue).

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Here are a few usage examples that made me curious about how to do this:

• Checking Python scripts for malicious code.
  If one team can access a large amount of code hidden in binary data, what does this command look like?
• ( , , ).
• - , , , , Python.

Answer 1

pyc?

, . - exec. :

spam = 'print(3)'
eggs = compile(spam, '<string>', 'exec')
exec(eggs)

:

marshal

import marshal
bytes = marshal.dumps( eggs )

eggs = marshal.loads( bytes )
exec( eggs )

Ned Batchelder, pyc .

.pyc , :

• ,
• .

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: Python2, Python3, pyc 12 8 . marshal.loads.

Answer 2

, .pyc , . , bar.pyc python , bar.py :

import bar
bar.call_function()