xdis

import marshal import types from xdis.std import Bytecode def example_function(): a = 10 b = 'hello' if a > 5: print(b) return a # Get the code object of the function code_obj = example_function.__code__ # Disassemble using xdis.std.Bytecode (similar to stdlib dis) print(f"\nDisassembly for Python {code_obj.co_firstlineno} via xdis.std:") for instr in Bytecode(code_obj): print(instr) # Example of loading bytecode from a marshal.dumps() output (simulated .pyc content) # For true cross-version loading, you'd use xdis.load.load_bytecode_from_file # or xdis.load.load_bytecode_from_cstring to specify the Python magic number. def mock_marshal_loader(code_obj, python_version): # This is a simplified example; xdis.load handles actual magic numbers/versions # The real power is in loading *other* Python versions' bytecode. # For simplicity here, we'll just demonstrate disassembling a marshalled object. marshalled_code = marshal.dumps(code_obj) return marshalled_code marshalled_bytes = mock_marshal_loader(code_obj, (3, 9)) # Simulate Python 3.9 bytecode try: # To truly demonstrate xdis's cross-version capability, you'd load a .pyc file # generated by a *different* Python version than the one running this code. # For this example, we'll just show disassembling an arbitrary code object. # For actual cross-version loading, investigate xdis.load functions. print(f"\nDisassembly of a marshalled code object (Python {code_obj.co_firstlineno}):") # Note: For actual different Python versions, you'd need the specific magic number # and potentially xdis.load.load_bytecode_from_cstring or file-based loaders. # We'll re-disassemble the current code_obj for a runnable example. from xdis.bytecode import disassemble disassemble(code_obj) except Exception as e: print(f"Could not fully demonstrate cross-version load in quickstart due to complexity: {e}")