code: def determine_file_extension_based_on_format(format_specifier):
  	
  	if format_specifier == FMT_INI:
  		return 'ini'
  	if format_specifier == FMT_DELIMITED:
  		return ''
  	if format_specifier == FMT_XML:
  		return 'xml'
  	if format_specifier == FMT_JSON:
  		return 'json'
  	if format_specifier == FMT_YAML:
  		return 'yml'
  	raise ValueError('invalid format specifier: {}'.format(format_specifier))
docs: returns file extension string