将函数应用于字典中2个键的每一种可能组合

def apply_function_to_dict(dictionary, func):
    keys = list(dictionary.keys())
    for i in range(len(keys)):
        for j in range(i+1, len(keys)):
            key1 = keys[i]
            key2 = keys[j]
            value1 = dictionary[key1]
            value2 = dictionary[key2]
            result = func(value1, value2)
            print(f"Applying function to keys '{key1}' and '{key2}': {result}")

# 示例字典
my_dict = {
    "key1": 10,
    "key2": 20,
    "key3": 30,
    "key4": 40
}

# 示例函数
def multiply(a, b):
    return a * b

# 应用函数到字典的每一种可能组合
apply_function_to_dict(my_dict, multiply)