code: def find_module(self, name, path=None):
          
          if name in self.loaded_modules:
              return None
  
          hooks = self.post_load_hooks.get(name, None)
  
          if hooks:
              return self
docs: Called when an import is made. If there are hooks waiting for this
          module to be imported then we stop the normal import process and
          manually load the module.
  
          @param name: The name of the module being imported.
          @param path The root path of the module (if a package). We ignore this.
          @return: If we want to hook this module, we return a C{loader}
              interface (which is this instance again). If not we return C{None}
              to allow the standard import process to continue.