Python条件语句失效求助：选择乘法却执行加法运算

• 核心错误：逻辑判断写法错误
  你写的if operation == "add" or "Add"并不是判断operation等于"add"或者"Add"，Python会把它解析成(operation == "add") or "Add"。非空字符串在布尔判断里是True，所以这个条件永远成立——不管你输入什么操作，都会执行加法分支。同理，elif里的operation == "multiply" or "Muptiply"不仅有逻辑判断错误，还把"Multiply"拼写成了"Muptiply"，双重错误导致乘法分支永远不会触发。

• 两种正确的修正写法

  1. 明确对每个选项做相等判断：

     if operation == "add" or operation == "Add":
     

  2. 统一转换为小写（或大写）后判断，更简洁且容错性更强（比如用户输入"ADD"也能识别）：

     if operation.lower() == "add":
     

• 修正后的完整代码
  优化后的代码同时修复了拼写错误、逻辑问题，还调整了格式和可读性：

  input("Welcome to this calculator, press ENTER to continue")
  
  operation = input("Type one : Add  Subtract  Multiply  Divide   ")
  first_number = input(f"Type the first number you want to {operation}   ")
  second_number = input("Type the second number   ")
  
  if operation.lower() == "add":
      final_number = int(first_number) + int(second_number)
      new_operation = "adding "
  elif operation.lower() == "multiply":
      final_number = int(first_number) * int(second_number)
      new_operation = "multiplying "
  else:
      print("Not Yet Implemented")
      exit()  # 避免后续print因new_operation未定义报错
  
  print(f"Your result of {new_operation}{first_number} to {second_number} was {final_number}")
  

内容的提问来源于stack exchange，提问作者Crossbow4000