class Animal:def __init__(self, name):self.name = namedef speak(self):passclass Cat(Animal):def speak(self):return "Meow"class Dog(Animal):def speak(self):return "Woof"animals = [Cat("Tom"), Dog("Spike"), Cat("Kitty")]for animal in animals:print(f"{animal.name} says {animal...
# Python # Rtype() class()type(5) #int class(5) #numerictype(5.5) #float class(5.5) #numerictype('Hello') #string class('Hello') #charactertype(True) #bool class(True) #logical 赋值 # Python
以__name__进行单元测试 >>> def minmax(test,*args): ... res=args[0] ... for arg in args[1:]: ... if test(arg,res): ... res=arg ... return res ... >>> def lessthan(x,y):return x<y >>> def greatthan(x,y):return x>y >>> print minmax(lessthan,4,2,1,5,6,...
AI代码解释 <module'b'from'g:\\pycode\\b.py'><class'module'> 因为b是全局变量,所以当前程序文件a.py中不能重新对全局变量b进行赋值,这会使导入的模块b被丢弃。例如,下面是错误的: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 importb b=3print(b.x)# 已经没有模块b了 另外,因为import导入...
class People(object): def __init__(self, name, age): self.name = name self.age = age return def __str__(self): return self.name + ":" + str(self.age) def __lt__(self, other): return self.name < other.name if self.name != other.name else self.age < other.age ...
Class decorators are less common than function decorators. You should document these well, so that your users know how to apply them. Caching Return Values Decorators can provide a nice mechanism for caching and memoization. As an example, look at a recursive definition of the Fibonacci sequence...
class Employee: def __init__(self, name, salary): self.name = name self.salary = salary def printclass(self): try: print("{}'salary is {}, and his age is {}".format(self.name,self.salary,self.age)) except: print("Error! No age") employee = Employee(input(), input()) empl...
>>> TomboList.__mro__ (<class 'tombolist.TomboList'>, <class 'list'>, <class 'object'>) Tombola不在Tombolist.__mro__中,所以Tombolist不会从Tombola继承任何方法。这结束了我们的TombolaABC 案例研究。在下一节中,我们将讨论registerABC 函数在实际中的使用方式。
False: None, False, 数字类型0,空容器,包括空字符串‘’, class的__nonzero__() 或__len__返回0或False的实例 bool运算符:or and not, 遵循类似java/c的short-circuit, not比non-Boolean operator优先级低,not a==b 等价于not (a==b)
classPeople(object):def__init__(self,name,age):self.name=nameself.age=agereturndef__str__(self):returnself.name+":"+str(self.age)def__lt__(self,other):returnself.name<other.nameifself.name!=other.nameelseself.age<other.ageif__name__=="__main__":print("\t".join([str(item)fo...