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8-5 Cities: Write a function called describe_city () that accepts the name of a city and the country to which the city belongs. This function should print a simple sentence, such as Reykjavik is in Iceland. Specifies a default value for the formal parameter used to store the country. This function is called for three different cities, and at least one of them does not belong to the default country.The main content of this program: Ruan Hongyun is the wife of shop-owner of Hongyun Picking Garden, more than 20 kilometers away from Ho Chi Minh City. Born in this land, she witnessed the development of the local agricultural economy for decades. Vietnam, which is located in a tropical monsoon climate, is a traditional agricultural country. Its unique geographical location makes Vietnamese fruits famous all over the world. (Charming Vietnam 20171108 Episode II)现在，《倚天》的人气高到恐怖，《武侠世界》杂志的销量再创新高，网上对《倚天》的讨论如潮。白凡恍然未觉，也不诚惶诚恐。The scenarios used in the command mode include: sometimes it is necessary to send a request to some objects, but I don't know who the recipient of the request is or what the operation of the request is. At this time, I hope to design the program code in a loosely coupled way; So that the request sender and the request receiver eliminate the coupling relationship in each other's codes.