Question

我的python程序在正则表达式函数中给出了意想不到的结果，当我输入一个用于识别的号牌时，它告诉我它无效，虽然它是有效的但我不知道为什么？

如果你能告诉我什么是错的并给出一个可能的解决方案，我将不胜感激，因为这是一项非常重要的家庭作业。

#Start
#04/02/2016
bad=[]#initialise bad list
data="Y"#initialise value to prevent infinite loop
standardNumberPlateObj=""
NumPlate=""
import re#import re functions
import pickle#import pickle function

print ("Welcome to the number plate recognition program.\n\n")
choice=input("Press 1 to input number plates and save\nPress 2 to read binary number plate file: ")
if choice == "1":
        while data=="Y":# while loop
            NumPlate = input("Input Registration number in format (XX01 XXX) *With a space at the end!*:\n\n") #user input for numberplate
            standardNumberPlateObj=re.match(r'\w\w\d\d\s\w\w\w\s', NumPlate, re.M|re.I)#validate that numberplate is valid

            if standardNumberPlateObj:
                print("Verification Success")
                data=input(str("Would you like to continue? (Y/N):"))

            else:
                print("Verification Failed")
                bad.append(NumPlate)#add numberplate to bad list
                data=input(str("Would you like to continue? (Y/N):"))#ask user to continue


        while data=="N":#saving number plates to file if user enters N
             f = open("reg.dat", "wb")
             pickle.dump(bad, f)
             f.close()
             print ("\nRestart the program to read binary file!")#ending message
             break

elif choice == "2":
             print ("\nBad number plates:\n\n")
             f=open("reg.dat", "rb")
             Registrations = pickle.load(f)
             print(Registrations)
             f.close()

else:
             print ("Please enter a valid choice!")

print ("\n END of program!")

Answer 1

如果没有示例输入以及预期和实际结果，这是不可能的。

但是从表达式\w\w\d\d\s\w\w\w\s以及提示符（XX01 XXX）中的示例来判断，我说你的正则表达式最终期望一个空格，而你的输入并没有＆＃ 39;提供一个。

Python程序给出意想不到的结果，为什么

1 个答案: