def parse_hl_lines(expr):
 if (not expr):
  return []
 try:
  return list(map(int, expr.split()))
 except ValueError:
  return []

def parse_hl_lines ( expr ) : if ( not expr ) : return [ ] try : return list ( map ( int , expr . split ( ) ) ) except ValueError : return [ ]
support our syntax for emphasizing certain lines of code .