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python2014
/
python-learn
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python-learn
/
class.py
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class.py
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#!/usr/bin/python
#coding:utf-8
# 如果一个 Python 函数,类方法,或属性的名字
# 以两个下划线开始 (但不是结束),它是私有的;
# 其它所有的都是公有的。
# Python 没有类方法保护 的概念 (只能用于它们自已的类和子类中)。
# 类方法或者是私有 (只能在它们自已的类中使用) 或者是公有 (任何地方都可使用)。
# 虽然ptyhon 不支持方法的重载,但,其实没必要 见 http://www.zhihu.com/question/20053359
# 以及python作者搞的重载 http://www.artima.com/weblogs/viewpost.jsp?thread=101605
class
Animal
:
"""Animal的文档的描述字符串"""
typeName
=
'animal'
;
# 静态方法
def
__init__
(
self
,
name
=
'unknow'
,
say
=
'呜呜呜'
):
#构造函数
self
.
name
=
name
;
# self相当于this,实例对象只能在self上定义
self
.
say
=
say
;
def
describe
(
self
):
# 实例方法
return
self
.
say
+
'~ My name is '
+
self
.
name
+
'. I
\'
m a '
+
Animal
.
typeName
;
def
__secret
(
self
):
# 私有变量,不会被继承
print
'haha you find me!'
;
@
staticmethod
# 2.4 后的版本需要加这个
def
haha
():
# 类方法 第一个参数不能加 self。因为其不能访问self
print
Animal
.
typeName
+
' haha'
;
an
=
Animal
(
'Nacy'
);
#创建实例不能带 new,否则报错!
an
.
haha
();
# 也可以调用
Animal
.
haha
();
print
an
.
describe
();
an
.
_Animal__secret
();
# 访问私有变量
print
Animal
.
typeName
,
an
.
name
,
an
.
typeName
;
# animal Nacy animal
an
.
typeName
=
'change'
;
print
Animal
.
typeName
,
an
.
typeName
;
# animal, change
# python 支持多继承
class
Cat
(
Animal
):
# 继承,python不会主动的调父类的构造函数
"""docstring for Cat"""
def
__init__
(
self
,
name
):
Animal
.
__init__
(
self
,
name
,
'喵喵喵喵'
);
cat
=
Cat
(
'Xiao hua'
);
print
cat
.
describe
();
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