#  #


## 1 ##







![](http://twowaterimage.oss-cn-beijing.aliyuncs.com/2020-03-09-014706.jpg)








## 2 ##





```python
class ClassName():
    
    .
    .
    .
    
```

 `class`  `def` 



```python
class ClassA():
    var1 = 100
    var2 = 0.01
    var3 = ''

    def fun1():
        print(' fun1')

    def fun2():
        print(' fun1')

    def fun3():
        print(' fun1')
```

 `ClassA` ,  3  `var1` , `var2`  `var3`  3  `fun1()` , `fun2()`  `fun3()` 


## 3 ##






![](http://twowaterimage.oss-cn-beijing.aliyuncs.com/2020-03-09-014728.jpg)






![](http://twowaterimage.oss-cn-beijing.aliyuncs.com/2020-03-09-014742.jpg)