code: def Set(self, name, value):
      
      # If the configuration system has a write back location we use it,
      # otherwise we use the primary configuration object.
      if self.writeback is None:
        logging.warning("Attempting to modify a read only config object for %s.",
                        name)
      if name in self.constants:
        raise ConstModificationError(
            "Attempting to modify constant value %s" % name)
  
      writeback_data = self.writeback_data
  
      # Check if the new value conforms with the type_info.
      if value is not None:
        if isinstance(value, Text):
          value = self.EscapeString(value)
  
      writeback_data[name] = value
      self.FlushCache()
docs: Update the configuration option with a new value.
  
      Note that this forces the value to be set for all contexts. The value is
      written to the writeback location if Save() is later called.
  
      Args:
        name: The name of the parameter to set.
        value: The value to set it to. The value will be validated against the
          option's type descriptor.
  
      Raises:
        ConstModificationError: When attempting to change a constant option.