My loader receives part of the program from the server as .pyc files (the files themselves are NOT saving in client pc's filesystem, the byte sequence is stored in a variable).
I need to create a module from this byte sequence without creating a file.
I found a way to create a module from a string:
spec = importlib.util.spec_from_loader("modulename", loader=None) # creating spec
module = importlib.util.module_from_spec(spec) # creating module
exec(source, module.__dict__) # executing module
# so that we can import it in other program files
sys.modules[name] = module
globals()[name] = module
But it doesn't work for me in my case.
The module is initially created with py_compile.compile("sorcefile.py", "destfile.pyc").
The answer to a similar question (How to load compiled python modules from memory?) suggests using marshal.loads(bytes[8:]) and indeed, looking at the source code of py_compile.compile function (https://svn.python.org/projects/python/trunk/Lib/py_compile.py) I saw that it uses marshal.dump(). However, as far as I understand, this code is deprecated, because looking at the source code of this function in my Python instance (3.11) (https://github.com/python/cpython/blob/3.11/Lib/py_compile.py), I saw that it no longer uses marshall.
This explains why this error appears in the following situation:
import marshal
import py_compile
py_compile.compile("source.py", "compiled.pyc")
with open("compiled.pyc", "rb") as f:
module_bytes = f.read()
module = marshal.loads(module_bytes[8:])
Output:
Traceback (most recent call last):
File "C:\test.py", line 9, in <module>
module = marshal.loads(module_bytes[8:])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ValueError: bad marshal data (unknown type code)
(In this case, the pyc file is created only to emulate the data received from the server.)
So, is it possible to create a module from a sequence of bytes without creating a file in python 3.11 (as in the "string" method).
