python笔记：2.1.3.1实例属性和类属性

最新推荐文章于 2025-06-15 16:09:58 发布

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最新推荐文章于 2025-06-15 16:09:58 发布

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# -*- coding: utf-8 -*-
"""
Created on Sun May 12 22:53:04 2019

@author: User
"""

class Human(object):
    
    domain = 'eukarya'
    def __init__(self, kingdom='Animalia',phylum='Chordata',
                order='Primates',family='Human Being'):
        self.kingdom = kingdom
        self.phylum=phylum
        self.order = order
        self.family = family
    
    def typewrite(self):
        print('This is %s typing words!' %self.family)
    def add(self, n1, n2):
        n = n1 + n2
        print(str(n1) + '+' + str(n2) + '+' + str(n))
        print('You see! %s can calculate!' %self.family)
        
    @classmethod
    def showclassmethodinfo(cls):
        print(cls.__name__) #__name__属性，其值为类名
        print(dir(cls))    #使用dir列示本类的所有方法
        
        
ZhangSan = Human()

print(Human.domain)
print(ZhangSan.domain)

# kingdom是实例属性，只能通过实例名来访问。所以下面这句会出错
print(Human.kingdom)

运行：

eukarya
eukarya
Traceback (most recent call last):

File "<ipython-input-37-b3a1b8a92764>", line 1, in <module>
runfile('D:/0python/2.1.3.1实例属性和类属性_0512.py', wdir='D:/0python')

File "C:\ProgramData\Anaconda3\lib\site-packages\spyder_kernels\customize\spydercustomize.py", line 786, in runfile
execfile(filename, namespace)

File "C:\ProgramData\Anaconda3\lib\site-packages\spyder_kernels\customize\spydercustomize.py", line 110, in execfile
exec(compile(f.read(), filename, 'exec'), namespace)

File "D:/0python/2.1.3.1实例属性和类属性_0512.py", line 37, in <module>
print(Human.kingdom)

AttributeError: type object 'Human' has no attribute 'kingdom'