def trailing_blank_lines(physical_line, lines, line_number):
 if ((not physical_line.rstrip()) and (line_number == len(lines))):
  return (0, 'W391 blank line at end of file')

def trailing_blank_lines ( physical_line , lines , line_number ) : if ( ( not physical_line . rstrip ( ) ) and ( line_number == len ( lines ) ) ) : return ( 0 , 'W391 blank line at end of file' )
trailing blank lines are superfluous .