from importlib import import_module
from typing import Type

class ClassLoader:
    def loadClass(self, fullclasspath:str)->Type:
      '''
      @param fullclasspath a string of the form full.path.to.pyfile.classname
          where pyfile is the name of the module (file) without the .py
          and classname is the actual name of the class inside that file  
      @return Type (=class object)
      @raise ModuleNotFoundError if module or class not found: 
      '''
      if not "." in fullclasspath:
          raise ModuleNotFoundError("classpath misses a '.':"+fullclasspath)
      
      mo,cl = fullclasspath.rsplit('.', 1)
      try:
        mod = import_module(mo)
      except ModuleNotFoundError as e:
          raise e
      except BaseException as e:
          raise ModuleNotFoundError("Module crashes on load",e)
      if hasattr(mod, cl):
          return getattr(mod, cl)
      raise ModuleNotFoundError("module "+mo+" does not contain class "+cl)