Python 3.x 在类方法内导入会产生NameError

我尝试从类函数中的文件导入函数。 无论我如何改变它，当我尝试加载函数时，它都会导致一个NameError

模块代码结构为：

def myfunc(params):
    return sum(params) # this is just a simple example for demonstration

class Pipeline:

   def loadfunc(self,filename):

        path, modul = arc_filename.rsplit('\\', 1)
        modul = modul[:-3] # removing the .py ending
        sys.path.insert(1, path)
        exec('from ' + modul + ' import *')

        ###     debug prints:    ####
        if ('myfunc' in dir(modul) and modul.isfunction(modul.myfunc)):
            print('myfunc is defined as function in modul ', modul)
        if modul in sys.modules:
            print(modul, 'was imported successfully')
        else:
            print(modul, 'was not imported')
        try:
            myfunc
        except NameError:
            print("myfunc not in scope!")
        else:
            print("myfunc in scope!")

类别代码结构为：

def myfunc(params):
    return sum(params) # this is just a simple example for demonstration

class Pipeline:

   def loadfunc(self,filename):

        path, modul = arc_filename.rsplit('\\', 1)
        modul = modul[:-3] # removing the .py ending
        sys.path.insert(1, path)
        exec('from ' + modul + ' import *')

        ###     debug prints:    ####
        if ('myfunc' in dir(modul) and modul.isfunction(modul.myfunc)):
            print('myfunc is defined as function in modul ', modul)
        if modul in sys.modules:
            print(modul, 'was imported successfully')
        else:
            print(modul, 'was not imported')
        try:
            myfunc
        except NameError:
            print("myfunc not in scope!")
        else:
            print("myfunc in scope!")

我还尝试以不同的方式在类方法中进行导入：

class Pipeline:

   def loadfunc(self,filename):

        path, modul = arc_filename.rsplit('\\', 1)
        modul = modul[:-3] # removing the .py ending
        os.chdir(path)
        exec('from ' + modul + ' import *')

        ###     debug prints:    ####
        if ('myfunc' in dir(modul) and modul.isfunction(modul.myfunc)):
            print('myfunc is defined as function in modul ', modul)
        if modul in sys.modules:
            print(modul, 'was imported successfully')
        else:
            print(modul, 'was not imported')
        try:
            myfunc
        except NameError:
            print("myfunc not in scope!")
        else:
            print("myfunc in scope!")

---

进口方法的不同并不重要。如果我只是尝试运行

myfunc

，代码将始终打印“myfunc不在范围内”或产生

NameError。我必须将它放在全局范围内，并将函数itseld导入类方法

这不是我一直在寻找的优雅的解决方案，但似乎是唯一可行的方法。
我过去曾尝试过一种优雅的解决方案，但我发现它并未遭到反对。你有没有见过我以前用过@bluetooth？我读过一些关于importlib解决方案的文章，我觉得有点过头了，但最后我可能会试试。@bluetooth谢谢！