有人知道这些问题怎么解决吗？

Question

刚开始学 尝试进行函数撰写

def calculator(a, operation, b):

operation = "+" or "-" or "/" or "*"
if operation == "/" and b == 0:
    return "cannot divide by zero”)
else operation not == "+" or "-" or "/" or "*"
    return "Operation not recognized"

第四行还是报错 EOL while scanning string literal

写一个叫calculator(a, operation, b)的函数，它有三个参数，a和b是数字，operation是数学运算“+”，“-”，“*”和“/”中的一个。函数应该使用给定的数字和操作返回计算的答案。如果操作为“/”且b = 0，则函数应返回“cannot divide by zero”。否则，如果operation不是四个数学操作之一，则函数应返回“operation not recognized”。

Answer 1

def calculator(a, operation, b):
    # operation = "+" or "-" or "/" or "*"
    if operation == "/" and b == 0:
        return "cannot divide by zero"
    elif operation not in ["+","-", "/","*"]:
        return "Operation not recognized"
    else:
        if operation == "/":
            return a/b
        elif operation =='*':
            return a*b
        elif operation == '+':
            return a+b
        else:
            return a-b

print(calculator(1, "/", 0))
print(calculator(1, "+", 2))
print(calculator(1, "-", 2))
print(calculator(1, "*", 2))
print(calculator(1, "/", 2))
print(calculator(1, "/,", 2))