類中的靜態變數 需要通過類名.靜態變數名 來修改 ；通過物件不能修改

python中如何統計一個類的例項化物件？？

 1 class Person:
 2       #靜態變數count，用於記錄類被例項化的次數
 3      count = 0
 4       
 5       mind = "有思想"
 6       animal = "高階動物"
 7       soul = "有思想"
 8       def __init__(self ,country ,name ,sex ,age ,height ):
 9             self.country = country
 
10             self.name = name
11             self.sex = sex
12             self.age = age
13             self.height = height
14             #類被例項化時，會自動呼叫__init__()方法
15             #類中的靜態變數 需要類名.靜態變數來修改
16             Person.count += 1
17             
18       def eat(self):
19             print("
 
%s在吃飯" %self.name)
20       def sleep(self):
21             print("%s睡覺" %self.name)
22       def  work(self):
23             print("%s工作……" %self.name)
24 
25 p1 = Person("中國","張三","男","42","175")
26 p2 = Person("中國","李四","男","35","180")
27 p3 = Person("美國","tanx","女","21","160")
28 p4 = Person(p1.country,p2.name,p3.sex,p2.age,p3.height)
 
29 
30 #通過類名   可以改變類中的靜態變數
31 print(Person.count)
32 
33 #通過物件 不能改變類中的靜態變數的值 
34 p1.count = 8
35 print(Person.__dict__)

執行結果為：

4
{'__module__': '__main__', 'count': 4, 'mind': '有思想', 'animal': '高階動物', 'soul': '有思想', 

'__init__': <function Person.__init__ at 0x00000000003C1E18>, 'eat': <function Person.eat at 0x000000000317AE18>, 

'sleep': <function Person.sleep at 0x000000000317AEA0>, 'work': <function Person.work at 0x000000000317AF28>, 
'__dict__': <attribute '__dict__' of 'Person' objects>, '__weakref__': <attribute '__weakref__' of 'Person' objects>, '__doc__': None}