Is to define a main method calculate in the AbstractCalculator class, calculate () calls spilt (), etc. Plus and Minus inherit the AbstractCalculator class respectively, and implement the call to subclasses through the call to AbstractCalculator, see the following example:
这是一出险象环生的猫鼠游戏：一伙训练有素的银行劫匪和经验丰富的警
“九一八”事变，是日本侵略中国的前奏，在制造华北五省和内蒙“自治”的同时，
At present, there is no firewall that can protect DNS server attacks, only a few professional protection equipment can do it.
Moreover, Xiao Bian should remind that the use of lockers is disposable. If you close them and open them halfway, you need to pay another fee before you can use them.
民政局干部简和平人到中年，生活波澜不惊犹如一谭死水。然而有一天，单位主任因为意外死亡，这给他带来不小的震动。另一方面母亲肺癌手术后康复，需要人照料，他把母亲接到自家同住，又遭到做护士的妻子齐英对住房的抱怨，加上升迁不顺利，以往平静生活中被掩藏的问题都一一暴露了出来……
讲述晚清年间，洋人横行，官府腐败无能，民不聊生。官逼民反，刘永福和串难兄弟阿富踊跃参加了广西天地会主要成员被迫移师德州境地，继续严惩恶霸，拥有了自己的部队一黑旗军。刘永福还率军英勇抗击法国侵略军对越南和中边境的入侵，并且捷报频传，声威大震，越南皇帝赐刘永福为千户大将。经过欲血奋战，终于南败法军，安邺毙命，黑旗军大旗高高飘扬在祖国边陲——安南。
《AKB48神TV》是由家庭剧场自2008年起播出的AKB48的冠名节目。制作企划方为东北新社.
《向幸福前进》的故事发生于上世纪九十年代末，东北老工业基地在进入市场经济之初，不可避免地遇到了瓶颈与艰难。身在国营大厂的向前进和高丽华夫妻同时下岗，他们没有怨天尤人，而是以东北人的乐观天性开始了再就业。通过几年的努力，向前进成立了股份制的物流公司。高丽华则在卖服装失败后，经营起报亭，与丈夫携手并肩为生活打拼。夫妻俩在最困难的时候，依然秉持良善之心，坚持收养患病女婴，伺候常年瘫痪的老人，凭借执着的信念和顽强乐观的人生态度，一步步走向属于他们的幸福。
黄夫人摆手道：这样最好，她要安置我还不放心呢。
Resource isolation can be regarded as a protective shield for user services. This protective system has extremely powerful data and traffic processing capabilities to filter abnormal traffic and requests for users. For example, for Syn Flood, the shield will respond to Syn Cookie or Syn Reset authentication, filter forged source data packets or attacks of power generation through authentication of data sources, and protect the server from malicious connection erosion. The resource isolation system mainly protects the third and fourth layers of ISO model. The schematic diagram of resource isolation is as follows:
来到重构世界后，卿尘却发现周遭的一切已经物是人非，巫族背负了谋逆血案，元凌身世也迷雾重重，面对卿尘，元凌已完全宛若陌路。命运让他们再度相遇，卿尘却不得不隐藏自己对元凌的深情，暗中守护、辅助元凌。相守相知却不敢相恋，情路坎坷而又漫长，当时空扭转，前尘不再，相逢的人可否再携手？
The lovely daughter Xia Xue in "Yang's Family Has a Woman Growing Up at the Beginning" and "Family Has Children" has been having new films and potential stocks in recent years. Please sign them first.
? Why is the United States so afraid of "Made in China 2025"? What is the connection and difference between "Made in China 2025" and the industrial Internet proposed by the United States and Industrial 4.0 proposed by Germany?
他不可置信地望着无辜的黎章，抖手指向他：大胆黎章，你……你好大的胆子。
The code for creating the object is encapsulated and the specific factory class is instantiated, thus achieving the purpose of encapsulation and instantiation. Encapsulating the code that creates the object in one place can also achieve the purpose of reuse and is more convenient for later maintenance. This also means that when the customer instantiates the object, he will only rely on the interface and not on the specific implementation. Help us to better achieve interface programming rather than implementation, making the code more flexible to cope with future extensions.
Restaurant.py
