code: def load_module(self, name):
          
          if name in sys.modules:
              return sys.modules[name]
          path = self.module2uri(name)
          if os.path.isfile(path):
              return self._load_module(name, path)
          elif os.path.isdir(path):
              return self._load_package(name, path)
          else:
              raise ImportError("Missing module source file %r" % path)
docs: Load and return a module
  
          Always returns the corresponding module. If the module is already
          loaded, the existing module is returned.