parameters: (self, full_name)
return_statement: return scope.extensions_by_name[extension_name]
docstring: Loads the named extension descriptor from the pool.
  
      Args:
        full_name: The full name of the extension descriptor to load.
  
      Returns:
        A FieldDescriptor, describing the named extension.
docstring_summary: Loads the named extension descriptor from the pool.
docstring_tokens: Loads the named extension descriptor from the pool .
function: def FindExtensionByName(self, full_name):
      """Loads the named extension descriptor from the pool.
  
      Args:
        full_name: The full name of the extension descriptor to load.
  
      Returns:
        A FieldDescriptor, describing the named extension.
      """
      full_name = _NormalizeFullyQualifiedName(full_name)
      message_name, _, extension_name = full_name.rpartition('.')
      try:
        # Most extensions are nested inside a message.
        scope = self.FindMessageTypeByName(message_name)
      except KeyError:
        # Some extensions are defined at file scope.
        scope = self.FindFileContainingSymbol(full_name)
      return scope.extensions_by_name[extension_name]
function_tokens: def FindExtensionByName ( self , full_name ) : full_name = _NormalizeFullyQualifiedName ( full_name ) message_name , _ , extension_name = full_name . rpartition ( '.' ) try : # Most extensions are nested inside a message. scope = self . FindMessageTypeByName ( message_name ) except KeyError : # Some extensions are defined at file scope. scope = self . FindFileContainingSymbol ( full_name ) return scope . extensions_by_name [ extension_name ]