1 # lex_error1.py 2 # 3 # Missing t_error() rule 4 5 import sys 6 if ".." not in sys.path: sys.path.insert(0,"..") 7 8 import ply.lex as lex 9 10 tokens = [ 11 "PLUS", 12 "MINUS", 13 "NUMBER", 14 ] 15 16 t_PLUS = r'\+' 17 t_MINUS = r'-' 18 t_NUMBER = r'\d+' 19 20 21 22 lex.lex() 23 24 25