如何在发生错误时让程序继续/重新启动？

Question

当我学习python时，我创建了这段代码，但问题是当某人输入与stm或mts不同的东西时，它只是输出错误信息并停止，我需要它继续并自行运行代码，因此我添加了一个while循环与继续声明，但它不能正常工作，它只是保持垃圾邮件的错误信息，请任何想法如何使我的代码保持运行没有垃圾邮件的信息或停止后..非常感谢你！

下面的代码：

print("Welcome to MoroccanDirham_SaudiRiyal converter program!") 

def mConv(): 
    def rial_saudi_to_moroccan_dirham(sar): 
     amount = sar * 2.67 
     print("Here is the result: ", amount, "MAD") 

    def moroccan_dirham_to_rial_saudi(mad): 
     amount = mad * 0.37 
     print("Here is the result: ", amount, "SAR") 
    usChoice = str(input("For SAR to MAD type stm and for MAD to SAR type mts: ")) 

    while True: 
     if usChoice == str("stm"): 
      x = int(input("Type the amount of money you want to convert: ")) 
      rial_saudi_to_moroccan_dirham(x) 
      return False 
     elif usChoice == str("mts"): 
      y = int(input("Type the amount of money you want to convert: ")) 
      moroccan_dirham_to_rial_saudi(y) 
      return False 
     elif usChoice != str("stm") or usChoice != str("mts") : 
      print("Error! Please choose between stm and mts.") 
      continue 
      return False 
     else: 
      return True 
mConv() 

Answer 1

移动usChoice = STR（输入（ “对于特区MAD型STM和MAD到SAR型MTS：”）） while循环中，并删除你的最后别的声明中，你不应该放回到那里，你可以写一个错误信息

打印（“欢迎来到MoroccanDirham_SaudiRiyal转换程序！”）

def mConv(): 
    def rial_saudi_to_moroccan_dirham(sar): 
     amount = sar * 2.67 
     print("Here is the result: ", amount, "MAD") 

    def moroccan_dirham_to_rial_saudi(mad): 
     amount = mad * 0.37 
     print("Here is the result: ", amount, "SAR") 


    while True: 
     usChoice = str(input("For SAR to MAD type stm and for MAD to SAR type mts: ")) 
     if usChoice == str("stm"): 
      x = int(input("Type the amount of money you want to convert: ")) 
      rial_saudi_to_moroccan_dirham(x) 
      return False 
     elif usChoice == str("mts"): 
      y = int(input("Type the amount of money you want to convert: ")) 
      moroccan_dirham_to_rial_saudi(y) 
      return False 
     else: 
      print("Invalid choice. Allowed choices"); 
      print("stm - rial to dirham"); 
      print("mts - dirham to rial"); 
mConv()