Detecting empty function definitions in python

Question

I need to detect whether a function is an empty definition or not. It can be like:

def foo():
    pass

or like:

def foo(i, *arg         


        

Answer 1

The method you propose does not quite work because empty functions that have docstrings have a slightly different bytecode.

The value of func.__code__.co_code for an empty function with no docstring is 'd\x00\x00S', while the value of it for a function with a docstring is 'd\x01\x00S'.

For my purposes, it works just to add the additional case to test for:

def isEmptyFunction(func):
    def empty_func():
        pass

    def empty_func_with_doc():
        """Empty function with docstring."""
        pass

    return func.__code__.co_code == empty_func.__code__.co_code or \
        func.__code__.co_code == empty_func_with_doc.__code__.co_code