初学者问题：OR 运算符不工作？ [复制]

Question

这个问题在这里已经有了答案：

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昨天关闭。

刚开始学习python，一直在做宠物项目。 在此期间，我决定使用 OR 运算符。 当我将它添加到我的一个 IF 语句中时，它按预期工作，但是当我将它添加到其他 3 个时，它只运行了第一个 IF 语句。

while True:
    
    operation = input("What order of operation would you like to use(Addition/A ,Subtraction/S ,Multiplication/M, Division/D)?")
    
    if operation == "Addition" or "a" :
        while True:
            Set_Number = int(input("Starting Number: "))
            counter = Set_Number
            print(counter)
            
            number = int(input("Add:"))
            add_count = number
            counter += add_count
            print(f"Your Answer is " + str(counter))
            
    if operation == "Multiplication" or "m" :
        while True: 
            Set_Number = int(input("Starting Number: "))
            counter = Set_Number
            print(counter)
            
            number = int(input("Multipled By:"))
            add_count = number
            counter = counter * add_count
            print(f"Your Answer is " + str(counter))
        
    if operation == "Division" or "d" :
        while True:
            Set_Number = int(input("Starting Number: "))
            counter = Set_Number
            print(counter)
            
            number = int(input("Divided By:"))
            add_count = number
            counter = counter/add_count
            print(f"Your Answer is " + str(counter))
                    
    if operation == "Subtraction" or "s" :
        while True:
            Set_Number = int(input("Starting Number: "))
            counter = Set_Number
            print(counter)
            
            number = int(input("Subtracted By:"))
            add_count = number
            counter = counter - add_count
            print(f"Your Answer is " + str(counter))

结果

What order of operation would you like to use(Addition/A ,Subtraction/S ,Multiplication/M, Division/D)?m
Starting Number: 8
8
Add:1
Your Answer is 9
Starting Number:

不知道怎么修。 需要帮忙。