code: def remove_environment(environment_var_name, system=False):
      
      config_filename = \
          _SYSTEM_CONFIG_FILE if system is True else _USER_CONFIG_FILE
      config = _read_config(config_filename)
  
      section = _ENVIRONMENT_SECTION_NAME
      config.remove_option(section, environment_var_name)
      _write_config(config, config_filename)
docs: Remove the specified environment setting from the appropriate config file.
  
      :param environment_var_name: The name of the environment setting to remove.
      :keyword system: Set to True to modify the system configuration file.
                       If not set, the user config file will be modified.