How to use the birdseye.utils.is_lambda function in birdseye

def find_code(root_code):
            # type: (CodeType) -> None
            for const in root_code.co_consts:  # type: CodeType
                if not inspect.iscode(const):
                    continue
                matches = (const.co_firstlineno == func.__code__.co_firstlineno and
                           const.co_name == func.__code__.co_name)
                if matches:
                    code_options.append(const)
                find_code(const)

        find_code(traced_file.code)

        if len(code_options) > 1:
            # Currently lambdas aren't allowed anyway, but should be in the future
            assert is_lambda(func)
            raise ValueError("Failed to trace lambda. Convert the function to a def.")
        new_func_code = code_options[0]  # type: CodeType

        # Give the new function access to the hooks
        # We have to use the original __globals__ and not a copy
        # because it's the actual module namespace that may get updated by other code
        func.__globals__.update(self._trace_methods_dict(traced_file))

        # http://stackoverflow.com/a/13503277/2482744
        # noinspection PyArgumentList
        new_func = FunctionType(new_func_code, func.__globals__, func.__name__, func.__defaults__, func.__closure__)
        update_wrapper(new_func, func)  # type: FunctionType
        if PY3:
            new_func.__kwdefaults__ = getattr(func, '__kwdefaults__', None)
        new_func.traced_file = traced_file
        return new_func

def test_is_lambda(self):
        self.assertTrue(is_lambda(lambda: 0))
        self.assertTrue(is_lambda(lambda x, y: x + y))
        self.assertFalse(is_lambda(min))
        self.assertFalse(is_lambda(flatten_list))
        self.assertFalse(is_lambda(self.test_is_lambda))

def test_is_lambda(self):
        self.assertTrue(is_lambda(lambda: 0))
        self.assertTrue(is_lambda(lambda x, y: x + y))
        self.assertFalse(is_lambda(min))
        self.assertFalse(is_lambda(flatten_list))
        self.assertFalse(is_lambda(self.test_is_lambda))

"""
        Returns a version of the passed function with the AST modified to
        trigger the tracing hooks.
        """
        if not isinstance(func, FunctionType):
            raise ValueError('You can only trace user-defined functions. '
                             'The birdseye decorator must be applied first, '
                             'at the bottom of the list.')

        try:
            if inspect.iscoroutinefunction(func) or inspect.isasyncgenfunction(func):
                raise ValueError('You cannot trace async functions')
        except AttributeError:
            pass

        if is_lambda(func):
            raise ValueError('You cannot trace lambdas')

        filename = inspect.getsourcefile(func)  # type: str

        if is_ipython_cell(filename):
            # noinspection PyPackageRequirements
            from IPython import get_ipython
            import linecache

            flags = get_ipython().compile.flags
            source = ''.join(linecache.cache[filename][2])
        else:
            source = read_source_file(filename)
            flags = 0

        # We compile the entire file instead of just the function source

def find_code(root_code):
            # type: (CodeType) -> None
            for const in root_code.co_consts:  # type: CodeType
                if not inspect.iscode(const):
                    continue
                matches = (const.co_firstlineno == func.__code__.co_firstlineno and
                           const.co_name == func.__code__.co_name)
                if matches:
                    code_options.append(const)
                find_code(const)

        find_code(traced_file.code)

        if len(code_options) > 1:
            # Currently lambdas aren't allowed anyway, but should be in the future
            assert is_lambda(func)
            raise ValueError("Failed to trace lambda. Convert the function to a def.")
        new_func_code = code_options[0]  # type: CodeType

        # Give the new function access to the hooks
        # We have to use the original __globals__ and not a copy
        # because it's the actual module namespace that may get updated by other code
        func.__globals__.update(self._trace_methods_dict(traced_file))

        # http://stackoverflow.com/a/13503277/2482744
        # noinspection PyArgumentList
        new_func = FunctionType(new_func_code, func.__globals__, func.__name__, func.__defaults__, func.__closure__)
        update_wrapper(new_func, func)  # type: FunctionType
        if PY3:
            new_func.__kwdefaults__ = getattr(func, '__kwdefaults__', None)
        new_func.traced_file = traced_file
        return new_func

"""
        Returns a version of the passed function with the AST modified to
        trigger the tracing hooks.
        """
        if not isinstance(func, FunctionType):
            raise ValueError('You can only trace user-defined functions. '
                             'The birdseye decorator must be applied first, '
                             'at the bottom of the list.')

        try:
            if inspect.iscoroutinefunction(func) or inspect.isasyncgenfunction(func):
                raise ValueError('You cannot trace async functions')
        except AttributeError:
            pass

        if is_lambda(func):
            raise ValueError('You cannot trace lambdas')

        filename = inspect.getsourcefile(func)  # type: str

        if is_ipython_cell(filename):
            # noinspection PyPackageRequirements
            from IPython import get_ipython
            import linecache

            flags = get_ipython().compile.flags
            source = ''.join(linecache.cache[filename][2])
        else:
            source = read_source_file(filename)
            flags = 0

        # We compile the entire file instead of just the function source