parameters: (self, module_name, flag)
docstring: Records the module that defines a specific flag.
  
      We keep track of which flag is defined by which module so that we
      can later sort the flags by module.
  
      Args:
        module_name: A string, the name of a Python module.
        flag: A Flag object, a flag that is key to the module.
docstring_summary: Records the module that defines a specific flag.
docstring_tokens: Records the module that defines a specific flag .
function: def _RegisterFlagByModule(self, module_name, flag):
      """Records the module that defines a specific flag.
  
      We keep track of which flag is defined by which module so that we
      can later sort the flags by module.
  
      Args:
        module_name: A string, the name of a Python module.
        flag: A Flag object, a flag that is key to the module.
      """
      flags_by_module = self.FlagsByModuleDict()
      flags_by_module.setdefault(module_name, []).append(flag)
function_tokens: def _RegisterFlagByModule ( self , module_name , flag ) : flags_by_module = self . FlagsByModuleDict ( ) flags_by_module . setdefault ( module_name , [ ] ) . append ( flag )