返回字典的值，其中变量位于键或值之间

# 创建一个字典对象
my_dict = {"key1": "value1", "key2": "value2", "key3": "value3"}

# 使用变量作为键获取对应的值
variable_as_key = "key2"
value1 = my_dict.get(variable_as_key)
value2 = my_dict[variable_as_key]

# 使用变量作为值获取对应的键
variable_as_value = "value3"
key = next((k for k, v in my_dict.items() if v == variable_as_value), None)

# 打印结果
print("值为", value1)
print("值为", value2)
print("键为", key)