1#使用__metaclass__(元类)的高级python用法2classSingleton2(type):3def__init__(cls,name,bases,dict):4super(Singleton2,cls).__init__(name,bases,dict)5cls._instance=None6def__call__(cls,*args,**kw):7ifcls._instance is Non
class Card: def __init__(self,rank,suit): self.suit = suit self.rank = rank self.hard, self.soft = self._points() class NumberCard(Card): def _points(self): return int(self.rank), int(self.rank) class AceCard(Card): def _points(self): return 1, 11 class FaceCard(Card): d...
#/usr/bin/env python #coding:utf-8importlogging,logging.handlers defWriteLog(log_name):log_filename="/tmp/test.log"log_level=logging.DEBUG# 日志级别 format=logging.Formatter('%(asctime)s %(filename)s [line:%(lineno)2d]-%(funcName)s %(levelname)s %(message)s')# 日志格式 handler=lo...
**rocket.py** #!/usr/bin/python # -*- coding: utf-8 -*- import pygame as pg class Rocket(): def __init__(self, roc_settings, canvas): """初始化火箭的设置""" # 图像在canvas上 self.canvas = canvas self.settings = roc_settings # 导入火箭,调整大小,get rect self.image = pg....
$ cat main.py #!/usr/bin/env python # coding=utf-8 def main(): print "世界末⽇日!"! ! ! # 玛雅⼈人都是骗⼈人的! if __name__ == "__main__": main() 也可以写成: # -*- coding:utf-8 -*- 强制缩进 缩进是强制性的语法规则.通常建议⽤用 4 个空格代替 TAB,好在多数...
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encoded_text, decoded_text = huffman_coding(text) print("原始文本:", text) print("Huffman 编码:", encoded_text) print("解码结果:", decoded_text) 代码结束 在上述代码中,首先定义了`HuffmanNode`类来表示Huffman树的节点,然后实现了几个辅助函数来构建频率表、构建Huffman树、构建Huffman编码等。最后,...
# -*- coding: utf-8 -*-importosimportsysfromtypingimportListfromalibabacloud_oos20190601.clientimportClientasoos20190601Clientfromalibabacloud_tea_openapiimportmodelsasopen_api_modelsfromalibabacloud_oos20190601importmodelsasoos_20190601_modelsfromalibabacloud_tea_utilimportmodelsasutil_modelsfromalibabacloud_...
python是一种面向对象编程语言,自然也有类的概念。python中的类通过class 关键字定义,提供了面向对象的所有标准特性,例如允许一个类继承多个基类, 子类可以覆盖父类的方法,封装,继承,多态 面向对象的三大特性,python一样不少。 1.类的定义 #coding=utf-8classclazz:def__init__(self,names,age): ...
首先,自定义异常,基于“异常基类” class Error(Exception); 其次,except捕获所有异常过于鲁莽; 最后,鼓励使用finally执行“资源清理工作“。 全局变量 避免使用,考虑下”类变量“来代替。 嵌套/局部/内部类或函数 推荐使用! 对“类中类”情况的序列化(pickled)带来问题。