類與Python中

Question

類我有一個classex.py文件：

class Class1: 
    def method1(): 
     print 'stack1' 
    def method2(): 
     print 'over1' 
    def method3(): 
     print 'flow1' 

class Class2: 
    def method1(): 
     print 'stack2' 
    def method2(): 
     print 'over2' 
    def method3(): 
     print 'flow2' 

class Class3: 
    def method1(): 
     print 'stack3' 
    def method2(): 
     print 'over3' 
    def method3(): 
     print 'flow3' 

我想訪問classex文件類，所以我將導入該文件如何在不同類的訪問。

例如：

import classex 
print Class1.method1() 
print Class2.method2() 

我的期望輸出爲stack1和over2

Answer 1

class Class1: 
    def method1(self): # instance is passed implicity as first arg 
     print 'stack1' 
    def method2(self): 
     print 'over1' 
    def method3(self): 
     print 'flow1' 

class Class2: 
    def method1(self): 
     print 'stack2' 
    def method2(self): 
     print 'over2' 
    def method3(self): 
     print 'flow2' 

class Class3: 
    def method1(self): 
     print 'stack3' 
    def method2(self): 
     print 'over3' 
    def method3(self): 
     print 'flow3' 

---

>>> import classex 
>>> c = classex.Class1() # instance of Class1 
>>> c.method1() 
stack1 

Answer 2

你實際上並沒有導入類本身只是模塊。

import classex 

爲了訪問類，你必須做的：

>>> myclass = classex.Class1() 
>>> myclass2 = classex.Class2() 
>>> myclass.method1() 
stack1 
>>> mycalss2.Class2.method2() 
over2 

或者直接導入類：

>>> from classex import Class1, Class2 
>>> myclass = Class1() 
>>> myclass2 = Class2() 
>>> myclass.method1() 
stack1 
>>> myclass2.method2() 
over2 

Answer 3

或者你也可以做到這一點

class Class1: 
    @classmethod 
    def method1(clss): 
     print 'stack1' 
    @classmethod 
    def method2(clss): 
     print 'over1' 
    @classmethod 
    def method3(clss): 
     print 'flow1' 

class Class2: 
    @classmethod 
    def method1(clss): 
     print 'stack2' 
    @classmethod 
    def method2(clss): 
     print 'over2' 
    @classmethod 
    def method3(clss): 
     print 'flow2' 

class Class3: 
    @classmethod 
    def method1(clss): 
     print 'stack3' 
    @classmethod 
    def method2(clss): 
     print 'over3' 
    @classmethod 
    def method3(clss): 
     print 'flow3' 

然後

import classex 

classex.Class1.method2() 

等

但是，你正在做的並沒有真正讓我覺得你理解的那麼好，或者你是從有類的一些國王的另一OOP語言與正在添加OOP原則 - 方法，你會得到相同的結果。 面向對象的Python實現與Java或C＃等稍有不同，所以請務必閱讀一些關於如何在Python中定義方法的內容。