docs: def load_module(self, name):
          """
          Load and return a module
  
          Always returns the corresponding module. If the module is already
          loaded, the existing module is returned.
          """
          if name in sys.modules:
              return sys.modules[name]
          module_source = self.module2uri(name)
          module_container = tempfile.NamedTemporaryFile(suffix='.py', delete=False)
          with module_container:
              module_container.write(module_source)
              module_container.file.seek(0)
              module = imp.load_module(name, module_container.file, module_container.name, ('.py', 'U', imp.PY_SOURCE))
          module.__source__ = module_container
          module.__loader__ = self
          sys.modules[name] = module
          return module