Signed-off-by: twowater <347073565@qq.com>

pull/1/head
twowater 2017-09-11 09:44:22 +08:00
parent 146f75998a
commit 794096b4f2
36 changed files with 2001 additions and 1 deletions

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@ -0,0 +1,2 @@
#!/usr/bin/env python3
# -*- coding: UTF-8 -*-

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@ -0,0 +1,2 @@
#!/usr/bin/env python3
# -*- coding: UTF-8 -*-

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@ -0,0 +1,9 @@
#!/usr/bin/env python3
# -*- coding: UTF-8 -*-
class User(object):
def __init__(self, name, age):
self.name = name;
self.age = age;
user=User('两点水',23)

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@ -0,0 +1,41 @@
#!/usr/bin/env python3
# -*- coding: UTF-8 -*-
class Number(object):
def __init__(self, value):
self.value = value
def __eq__(self, other):
print('__eq__')
return self.value == other.value
def __ne__(self, other):
print('__ne__')
return self.value != other.value
def __lt__(self, other):
print('__lt__')
return self.value < other.value
def __gt__(self, other):
print('__gt__')
return self.value > other.value
def __le__(self, other):
print('__le__')
return self.value <= other.value
def __ge__(self, other):
print('__ge__')
return self.value >= other.value
if __name__ == '__main__':
num1 = Number(2)
num2 = Number(3)
print('num1 == num2 ? --------> {} \n'.format(num1 == num2))
print('num1 != num2 ? --------> {} \n'.format(num1 == num2))
print('num1 < num2 ? --------> {} \n'.format(num1 < num2))
print('num1 > num2 ? --------> {} \n'.format(num1 > num2))
print('num1 <= num2 ? --------> {} \n'.format(num1 <= num2))
print('num1 >= num2 ? --------> {} \n'.format(num1 >= num2))

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@ -0,0 +1,19 @@
#!/usr/bin/env python3
# -*- coding: UTF-8 -*-
class User(object):
def __new__(cls, *args, **kwargs):
# 打印 __new__方法中的相关信息
print('调用了 def __new__ 方法')
print(args)
# 最后返回父类的方法
return super(User, cls).__new__(cls)
def __init__(self, name, age):
print('调用了 def __init__ 方法')
self.name = name
self.age = age
if __name__ == '__main__':
usr = User('两点水', 23)

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@ -0,0 +1,16 @@
#!/usr/bin/env python3
# -*- coding: UTF-8 -*-
class User(object):
name=''
def __setattr__(self, name, value):
# 每一次属性赋值时, __setattr__都会被调用因此不断调用自身导致无限递归了
# 会造成程序奔溃
self.name = value
if __name__ == '__main__':
user = User()
user.name='两点水'

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@ -0,0 +1,34 @@
#!/usr/bin/env python3
# -*- coding: UTF-8 -*-
class User(object):
def __getattr__(self, name):
print('调用了 __getattr__ 方法')
return super(User, self).__getattr__(name)
def __setattr__(self, name, value):
print('调用了 __setattr__ 方法')
return super(User, self).__setattr__(name, value)
def __delattr__(self, name):
print('调用了 __delattr__ 方法')
return super(User, self).__delattr__(name)
def __getattribute__(self, name):
print('调用了 __getattribute__ 方法')
return super(User, self).__getattribute__(name)
if __name__ == '__main__':
user = User()
# 设置属性值,会调用 __setattr__
user.attr1 = True
# 属性存在,只有__getattribute__调用
user.attr1
try:
# 属性不存在, 先调用__getattribute__, 后调用__getattr__
user.attr2
except AttributeError:
pass
# __delattr__调用
del user.attr1

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@ -0,0 +1,9 @@
#!/usr/bin/env python3
# -*- coding: UTF-8 -*-
class User(object):
pass
if __name__ == '__main__':
print(dir(User()))

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@ -0,0 +1,38 @@
#!/usr/bin/env python3
# -*- coding: UTF-8 -*-
class User(object):
def __init__(self, name='两点水', sex=''):
self.sex = sex
self.name = name
def __get__(self, obj, objtype):
print('获取 name 值')
return self.name
def __set__(self, obj, val):
print('设置 name 值')
self.name = val
class MyClass(object):
x = User('两点水', '')
y = 5
if __name__ == '__main__':
m = MyClass()
print(m.x)
print('\n')
m.x = '三点水'
print(m.x)
print('\n')
print(m.x)
print('\n')
print(m.y)

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@ -0,0 +1,35 @@
#!/usr/bin/env python3
# -*- coding: UTF-8 -*-
class Meter(object):
def __init__(self, value=0.0):
self.value = float(value)
def __get__(self, instance, owner):
return self.value
def __set__(self, instance, value):
self.value = float(value)
class Foot(object):
def __get__(self, instance, owner):
return instance.meter * 3.2808
def __set__(self, instance, value):
instance.meter = float(value) / 3.2808
class Distance(object):
meter = Meter()
foot = Foot()
if __name__ == '__main__':
d = Distance()
print(d.meter, d.foot)
d.meter = 1
print(d.meter, d.foot)
d.meter = 2
print(d.meter, d.foot)

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@ -0,0 +1,56 @@
#!/usr/bin/env python3
# -*- coding: UTF-8 -*-
class FunctionalList:
''' 实现了内置类型list的功能,并丰富了一些其他方法: head, tail, init, last, drop, take '''
def __init__(self, values=None):
if values is None:
self.values = []
else:
self.values = values
def __len__(self):
return len(self.values)
def __getitem__(self, key):
return self.values[key]
def __setitem__(self, key, value):
self.values[key] = value
def __delitem__(self, key):
del self.values[key]
def __iter__(self):
return iter(self.values)
def __reversed__(self):
return FunctionalList(reversed(self.values))
def append(self, value):
self.values.append(value)
def head(self):
# 获取第一个元素
return self.values[0]
def tail(self):
# 获取第一个元素之后的所有元素
return self.values[1:]
def init(self):
# 获取最后一个元素之前的所有元素
return self.values[:-1]
def last(self):
# 获取最后一个元素
return self.values[-1]
def drop(self, n):
# 获取所有元素除了前N个
return self.values[n:]
def take(self, n):
# 获取前N个元素
return self.values[:n]

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@ -0,0 +1,56 @@
#!/usr/bin/env python3
# -*- coding: UTF-8 -*-
class FunctionalList:
''' 实现了内置类型list的功能,并丰富了一些其他方法: head, tail, init, last, drop, take'''
def __init__(self, values=None):
if values is None:
self.values = []
else:
self.values = values
def __len__(self):
return len(self.values)
def __getitem__(self, key):
return self.values[key]
def __setitem__(self, key, value):
self.values[key] = value
def __delitem__(self, key):
del self.values[key]
def __iter__(self):
return iter(self.values)
def __reversed__(self):
return FunctionalList(reversed(self.values))
def append(self, value):
self.values.append(value)
def head(self):
# 获取第一个元素
return self.values[0]
def tail(self):
# 获取第一个元素之后的所有元素
return self.values[1:]
def init(self):
# 获取最后一个元素之前的所有元素
return self.values[:-1]
def last(self):
# 获取最后一个元素
return self.values[-1]
def drop(self, n):
# 获取所有元素除了前N个
return self.values[n:]
def take(self, n):
# 获取前N个元素
return self.values[:n]

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@ -0,0 +1,11 @@
<?xml version="1.0" encoding="UTF-8"?>
<module type="PYTHON_MODULE" version="4">
<component name="NewModuleRootManager">
<content url="file://$MODULE_DIR$" />
<orderEntry type="inheritedJdk" />
<orderEntry type="sourceFolder" forTests="false" />
</component>
<component name="TestRunnerService">
<option name="PROJECT_TEST_RUNNER" value="Unittests" />
</component>
</module>

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@ -0,0 +1,7 @@
<component name="InspectionProjectProfileManager">
<settings>
<option name="useProjectProfile" value="false" />
<option name="USE_PROJECT_PROFILE" value="false" />
<version value="1.0" />
</settings>
</component>

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@ -0,0 +1,2 @@
#!/usr/bin/env python3
# -*- coding: UTF-8 -*-

View File

@ -0,0 +1,2 @@
#!/usr/bin/env python3
# -*- coding: UTF-8 -*-

View File

@ -0,0 +1,13 @@
#!/usr/bin/env python3
# -*- coding: UTF-8 -*-
from enum import Enum
Month = Enum('Month', ('Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'))
# 遍历枚举类型
for name, member in Month.__members__.items():
print(name, '---------', member, '----------', member.value)
# 直接引用一个常量
print('\n', Month.Jan)

View File

@ -0,0 +1,29 @@
#!/usr/bin/env python3
# -*- coding: UTF-8 -*-
from enum import Enum, unique
Enum('Month', ('Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'))
# @unique 装饰器可以帮助我们检查保证没有重复值
@unique
class Month(Enum):
Jan = 'January'
Feb = 'February'
Mar = 'March'
Apr = 'April'
May = 'May'
Jun = 'June'
Jul = 'July'
Aug = 'August'
Sep = 'September '
Oct = 'October'
Nov = 'November'
Dec = 'December'
if __name__ == '__main__':
print(Month.Jan, '----------',
Month.Jan.name, '----------', Month.Jan.value)
for name, member in Month.__members__.items():
print(name, '----------', member, '----------', member.value)

View File

@ -0,0 +1,21 @@
#!/usr/bin/env python3
# -*- coding: UTF-8 -*-
from enum import Enum
class User(Enum):
Twowater = 98
Liangdianshui = 30
Tom = 12
Twowater = User.Twowater
Liangdianshui = User.Liangdianshui
print(Twowater == Liangdianshui, Twowater == User.Twowater)
print(Twowater is Liangdianshui, Twowater is User.Twowater)
try:
print('\n'.join(' ' + s.name for s in sorted(User)))
except TypeError as err:
print(' Error : {}'.format(err))

View File

@ -0,0 +1,15 @@
#!/usr/bin/env python3
# -*- coding: UTF-8 -*-
import enum
class User(enum.IntEnum):
Twowater = 98
Liangdianshui = 30
Tom = 12
try:
print('\n'.join(s.name for s in sorted(User)))
except TypeError as err:
print(' Error : {}'.format(err))

View File

@ -18,4 +18,5 @@
|草根学Python 模块与包|[掘金](https://juejin.im/post/5962ddf95188252ec34009da)[简书](http://www.jianshu.com/p/7f05f915d2ac)[CSDN](http://blog.csdn.net/Two_Water/article/details/75042211)[个人博客](http://twowater.com.cn/2017/07/12/%E8%8D%89%E6%A0%B9%E5%AD%A6Python-%E5%85%AB-%E6%A8%A1%E5%9D%97%E4%B8%8E%E5%8C%85/)|
|草根学Python 面向对象|[掘金](https://juejin.im/post/596ca6656fb9a06b9b73c8b0)[简书](http://www.jianshu.com/p/6ecaa414c702)[CSDN](http://blog.csdn.net/two_water/article/details/76408890)[个人博客](http://twowater.com.cn/2017/07/31/%E8%8D%89%E6%A0%B9%E5%AD%A6Python-%E4%B9%9D-%E9%9D%A2%E5%90%91%E5%AF%B9%E8%B1%A1/)|
|草根学PythonPython 的 Magic Method|[掘金](https://juejin.im/post/59828c2f6fb9a03c56319baa)[简书](http://www.jianshu.com/p/345a80a02546)[CSDN](http://blog.csdn.net/two_water/article/details/77351516)[个人博客](http://twowater.com.cn/2017/08/18/%E8%8D%89%E6%A0%B9%E5%AD%A6Python-%E5%8D%81-Python-%E7%9A%84-Magic-Method/)|
|草根学Python十一枚举类|[掘金](https://juejin.im/post/599906a2f265da24722faec3)[简书](http://www.jianshu.com/p/c4d2629e5015)[CSDN](http://blog.csdn.net/Two_Water/article/details/77626179)[个人博客](http://twowater.com.cn/2017/08/28/%E8%8D%89%E6%A0%B9%E5%AD%A6Python-%E5%8D%81%E4%B8%80-%E6%9E%9A%E4%B8%BE%E7%B1%BB/)|
|草根学Python十一枚举类|[掘金](https://juejin.im/post/599906a2f265da24722faec3)[简书](http://www.jianshu.com/p/c4d2629e5015)[CSDN](http://blog.csdn.net/Two_Water/article/details/77626179)[个人博客](http://twowater.com.cn/2017/08/28/%E8%8D%89%E6%A0%B9%E5%AD%A6Python-%E5%8D%81%E4%B8%80-%E6%9E%9A%E4%B8%BE%E7%B1%BB/)|
|草根学Python十二元类|[掘金](https://juejin.im/post/59aff224f265da2476426796)[简书](http://www.jianshu.com/p/9b10fcee7cda)[CSDN](http://blog.csdn.net/two_water/article/details/77877621)[个人博客](http://twowater.com.cn/2017/09/07/%E8%8D%89%E6%A0%B9%E5%AD%A6Python-%E5%8D%81%E4%BA%8C-%E5%85%83%E7%B1%BB/)|

View File

@ -62,3 +62,10 @@
- [Enum 的源码](/python11/2.md)
- [自定义类型的枚举](/python11/3.md)
- [枚举的比较](/python11/4.md)
* [元类](/python12/Preface.md)
- [Python 中类也是对象](/python12/1.md)
- [使用 `type()` 动态创建类](/python12/2.md)
- [什么是元类](/python12/3.md)
- [自定义元类](/python12/4.md)
- [使用元类](/python12/4.md)

63
python12/1.md Normal file
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@ -0,0 +1,63 @@
# 一、Python 中类也是对象 #
在了解元类之前,我们先进一步理解 Python 中的类,在大多数编程语言中,类就是一组用来描述如何生成一个对象的代码段。在 Python 中这一点也是一样的。
```python
class ObjectCreator(object):
pass
mObject = ObjectCreator()
print(mObject)
```
输出结果:
```
<__main__.ObjectCreator object at 0x00000000023EE048>
```
但是Python 中的类有一点跟大多数的编程语言不同,在 Python 中,可以把类理解成也是一种对象。对的,这里没有写错,就是对象。
为什么呢?
因为只要使用关键字 `class` Python 解释器在执行的时候就会创建一个对象。
如:
```python
class ObjectCreator(object):
pass
```
当程序运行这段代码的时候就会在内存中创建一个对象名字就是ObjectCreator。这个对象自身拥有创建对象类实例的能力而这就是为什么它是一个类的原因。但是它的本质仍然是一个对象于是我们可以对它做如下的操作
```python
class ObjectCreator(object):
pass
def echo(ob):
print(ob)
mObject = ObjectCreator()
print(mObject)
# 可以直接打印一个类,因为它其实也是一个对象
print(ObjectCreator)
# 可以直接把一个类作为参数传给函数(注意这里是类,是没有实例化的)
echo(ObjectCreator)
# 也可以直接把类赋值给一个变量
objectCreator = ObjectCreator
print(objectCreator)
```
输出的结果如下:
```
<__main__.ObjectCreator object at 0x000000000240E358>
<class '__main__.ObjectCreator'>
<class '__main__.ObjectCreator'>
<class '__main__.ObjectCreator'>
```

90
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@ -0,0 +1,90 @@
# 二、使用 `type()` 动态创建类 #
因为类也是对象所以我们可以在程序运行的时候创建类。Python 是动态语言。动态语言和静态语言最大的不同,就是函数和类的定义,不是编译时定义的,而是运行时动态创建的。在之前,我们先了了解下 `type()` 函数。
首先我们新建一个 `hello.py` 的模块,然后定义一个 Hello 的 class
```python
class Hello(object):
def hello(self, name='Py'):
print('Hello,', name)
```
然后在另一个模块中引用 hello 模块,并输出相应的信息。其中 `type()` 函数的作用是可以查看一个类型和变量的类型。
```python
#!/usr/bin/env python3
# -*- coding: UTF-8 -*-
from com.twowater.hello import Hello
h = Hello()
h.hello()
print(type(Hello))
print(type(h))
```
输出的结果是怎样的呢?
```
Hello, Py
<class 'type'>
<class 'com.twowater.hello.Hello'>
```
上面也提到过,`type()` 函数可以查看一个类型或变量的类型,`Hello` 是一个 `class` ,它的类型就是 `type` ,而 `h` 是一个实例,它的类型就是 `com.twowater.hello.Hello`。前面的 `com.twowater` 是我的包名,`hello` 模块在该包名下。
在这里还要细想一下,上面的例子中,我们使用 `type()` 函数查看一个类型或者变量的类型。其中查看了一个 `Hello` class 的类型,打印的结果是: `<class 'type'>` 。其实 `type()` 函数不仅可以返回一个对象的类型也可以创建出新的类型。class 的定义是运行时动态创建的,而创建 class 的方法就是使用 `type()` 函数。比如我们可以通过 `type()` 函数创建出上面例子中的 `Hello` 类,具体看下面的代码:
```python
# -*- coding: UTF-8 -*-
def printHello(self, name='Py'):
# 定义一个打印 Hello 的函数
print('Hello,', name)
# 创建一个 Hello 类
Hello = type('Hello', (object,), dict(hello=printHello))
# 实例化 Hello 类
h = Hello()
# 调用 Hello 类的方法
h.hello()
# 查看 Hello class 的类型
print(type(Hello))
# 查看实例 h 的类型
print(type(h))
```
输出的结果如下:
```
Hello, Py
<class 'type'>
<class '__main__.Hello'>
```
在这里,需先了解下通过 `type()` 函数创建 class 对象的参数说明:
1、class 的名称,比如例子中的起名为 `Hello`
2、继承的父类集合注意 Python 支持多重继承如果只有一个父类tuple 要使用单元素写法;例子中继承 object 类,因为是单元素的 tuple ,所以写成 `(object,)`
3、class 的方法名称与函数绑定;例子中将函数 `printHello` 绑定在方法名 `hello`
具体的模式如下:
```python
type(类名, 父类的元组(针对继承的情况,可以为空),包含属性的字典(名称和值))
```
好了,了解完具体的参数使用之外,我们看看输出的结果,可以看到,通过 `type()` 函数创建的类和直接写 class 是完全一样的因为Python 解释器遇到 class 定义时,仅仅是扫描一下 class 定义的语法,然后调用 `type()` 函数创建出 class 的 。
不过一般的情况下,我们都是使用 `class ***...` 的方法来定义类的,不过 `type()` 函数也可以让我们创建出类来。也就是说,动态语言本身支持运行期动态创建类,这和静态语言有非常大的不同,要在静态语言运行期创建类,必须构造源代码字符串再调用编译器,或者借助一些工具生成字节码实现,本质上都是动态编译,会非常复杂。
可以看到,在 Python 中,类也是对象,你可以动态的创建类。其实这也就是当你使用关键字 class 时 Python 在幕后做的事情,而这就是通过元类来实现的。

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# 三、什么是元类 #
通过上面的介绍,终于模模糊糊的带到元类这里来了。可是我们到现在还不知道元类是什么东东。
我们创建类的时候,大多数是为了创建类的实例对象。那么元类呢?元类就是用来创建类的。也可以换个理解方式就是:元类就是类的类。
通过上面 `type()` 函数的介绍,我们知道可以通过 `type()` 函数创建类:
```python
MyClass = type('MyClass', (), {})
```
实际上 `type()` 函数是一个元类。`type()` 就是 Python 在背后用来创建所有类的元类。
那么现在我们也可以猜到一下为什么 `type()` 函数是 type 而不是 Type呢
这可能是为了和 str 保持一致性str 是用来创建字符串对象的类,而 int 是用来创建整数对象的类。type 就是创建类对象的类。你可以通过检查 `__class__` 属性来看到这一点。Python 中所有的东西,注意喔,这里是说所有的东西,他们都是对象。这包括整数、字符串、函数以及类。它们全部都是对象,而且它们都是从一个类创建而来。
```python
# 整形
age = 23
print(age.__class__)
# 字符串
name = '两点水'
print(name.__class__)
# 函数
def fu():
pass
print(fu.__class__)
# 实例
class eat(object):
pass
mEat = eat()
print(mEat.__class__)
```
输出的结果如下:
```
<class 'int'>
<class 'str'>
<class 'function'>
<class '__main__.eat'>
```
可以看到,上面的所有东西,也就是所有对象都是通过类来创建的,那么我们可能会好奇,`__class__` 的 `__class__` 会是什么呢?换个说法就是,创建这些类的类是什么呢?
我们可以继续在上面的代码基础上新增下面的代码:
```python
print(age.__class__.__class__)
print(name.__class__.__class__)
print(fu.__class__.__class__)
print(mEat.__class__.__class__)
```
输出的结果如下:
```
<class 'type'>
<class 'type'>
<class 'type'>
<class 'type'>
```
认真观察,再理清一下,上面输出的结果是我们把整形 `age` ,字符创 `name` ,函数 `fu` 和对象实例 `mEat``__class__``__class__` 打印出来的结果。也可以说是他们类的类打印结果。发现打印出来的 class 都是 type 。
一开始也提到了,元类就是类的类。也就是元类就是负责创建类的一种东西。你也可以理解为,元类就是负责生成类的。而 type 就是内建的元类。也就是 Python 自带的元类。

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# 四、自定义元类 #
到现在,我们已经知道元类是什么东东了。那么,从始至终我们还不知道元类到底有啥用。只是了解了一下元类。在了解它有啥用的时候,我们先来了解下怎么自定义元类。因为只有了解了怎么自定义才能更好的理解它的作用。
首先我们来了解下 `__metaclass__` 属性
metaclass直译为元类简单的解释就是
当我们定义了类以后,就可以根据这个类创建出实例,所以:先定义类,然后创建实例。
但是如果我们想创建出类呢那就必须根据metaclass创建出类所以先定义metaclass然后创建类。
连接起来就是先定义metaclass就可以创建类最后创建实例。
所以metaclass允许你创建类或者修改类。换句话说你可以把类看成是metaclass创建出来的“实例”。
```python
class MyObject(object):
__metaclass__ = something…
[…]
```
如果是这样写的话Python 就会用元类来创建类 MyObject。当你写下 `class MyObject(object)`,但是类对象 MyObject 还没有在内存中创建。Python 会在类的定义中寻找 `__metaclass__` 属性如果找到了Python 就会用它来创建类 MyObject如果没有找到就会用内建的 type 函数来创建这个类。如果还不怎么理解,看下下面的流程图:
![__metaclass__的介绍](https://user-gold-cdn.xitu.io/2017/9/6/06c5a4390887abd3d79401848742f5ce)
再举个实例:
```python
class Foo(Bar):
pass
```
它的判断流程是怎样的呢?
首先判断 Foo 中是否有 `__metaclass__` 这个属性如果有Python 会在内存中通过 `__metaclass__` 创建一个名字为 Foo 的类对象(注意,这里是类对象)。如果 Python 没有找到`__metaclass__` ,它会继续在 Bar父类中寻找`__metaclass__` 属性,并尝试做和前面同样的操作。如果 Python在任何父类中都找不到 `__metaclass__` ,它就会在模块层次中去寻找 `__metaclass__` ,并尝试做同样的操作。如果还是找不到` ` `__metaclass__` ,Python 就会用内置的 type 来创建这个类对象。
其实 `__metaclass__` 就是定义了 class 的行为。类似于 class 定义了 instance 的行为metaclass 则定义了 class 的行为。可以说class 是 metaclass 的 instance。
现在,我们基本了解了 `__metaclass__` 属性,但是,也没讲过如何使用这个属性,或者说这个属性可以放些什么?
答案就是可以创建一个类的东西。那么什么可以用来创建一个类呢type或者任何使用到 type 或者子类化 type 的东东都可以。
元类的主要目的就是为了当创建类时能够自动地改变类。通常你会为API 做这样的事情,你希望可以创建符合当前上下文的类。假想一个很傻的例子,你决定在你的模块里所有的类的属性都应该是大写形式。有好几种方法可以办到,但其中一种就是通过在模块级别设定`__metaclass__` 。采用这种方法,这个模块中的所有类都会通过这个元类来创建,我们只需要告诉元类把所有的属性都改成大写形式就万事大吉了。
幸运的是,`__metaclass__` 实际上可以被任意调用,它并不需要是一个正式的类。所以,我们这里就先以一个简单的函数作为例子开始。
```python
# 元类会自动将你通常传给type的参数作为自己的参数传入
def upper_attr(future_class_name, future_class_parents, future_class_attr):
'''返回一个类对象,将属性都转为大写形式'''
# 选择所有不以'__'开头的属性
attrs = ((name, value) for name, value in future_class_attr.items() if not name.startswith('__'))
```
```python
# 将它们转为大写形式
uppercase_attr = dict((name.upper(), value) for name, value in attrs)
# 通过'type'来做类对象的创建
return type(future_class_name, future_class_parents, uppercase_attr)
__metaclass__ = upper_attr
# 这会作用到这个模块中的所有类
class Foo(object):
# 我们也可以只在这里定义__metaclass__这样就只会作用于这个类中
bar = 'bip'
```
```python
print hasattr(Foo, 'bar')
# 输出: False
print hasattr(Foo, 'BAR')
# 输出:True
f = Foo()
print f.BAR
# 输出:'bip'
```
用 class 当做元类的做法:
```python
# 请记住,'type'实际上是一个类,就像'str'和'int'一样
# 所以你可以从type继承
class UpperAttrMetaClass(type):
# __new__ 是在__init__之前被调用的特殊方法
# __new__是用来创建对象并返回之的方法
# 而__init__只是用来将传入的参数初始化给对象
# 你很少用到__new__除非你希望能够控制对象的创建
# 这里创建的对象是类我们希望能够自定义它所以我们这里改写__new__
# 如果你希望的话你也可以在__init__中做些事情
# 还有一些高级的用法会涉及到改写__call__特殊方法但是我们这里不用
def __new__(upperattr_metaclass, future_class_name, future_class_parents, future_class_attr):
attrs = ((name, value) for name, value in future_class_attr.items() if not name.startswith('__'))
uppercase_attr = dict((name.upper(), value) for name, value in attrs)
return type(future_class_name, future_class_parents, uppercase_attr)
```
但是,这种方式其实不是 OOP。我们直接调用了 type而且我们没有改写父类的 `__new__` 方法。现在让我们这样去处理:
```python
class UpperAttrMetaclass(type):
def __new__(upperattr_metaclass, future_class_name, future_class_parents, future_class_attr):
attrs = ((name, value) for name, value in future_class_attr.items() if not name.startswith('__'))
uppercase_attr = dict((name.upper(), value) for name, value in attrs)
# 复用type.__new__方法
# 这就是基本的OOP编程没什么魔法
return type.__new__(upperattr_metaclass, future_class_name, future_class_parents, uppercase_attr)
```
你可能已经注意到了有个额外的参数 `upperattr_metaclass` ,这并没有什么特别的。类方法的第一个参数总是表示当前的实例,就像在普通的类方法中的 self 参数一样。当然了,为了清晰起见,这里的名字我起的比较长。但是就像 self 一样,所有的参数都有它们的传统名称。因此,在真实的产品代码中一个元类应该是像这样的:
```python
class UpperAttrMetaclass(type):
def __new__(cls, name, bases, dct):
attrs = ((name, value) for name, value in dct.items() if not name.startswith('__')
uppercase_attr = dict((name.upper(), value) for name, value in attrs)
return type.__new__(cls, name, bases, uppercase_attr)
```
如果使用 super 方法的话,我们还可以使它变得更清晰一些,这会缓解继承(是的,你可以拥有元类,从元类继承,从 type 继承)
```python
class UpperAttrMetaclass(type):
def __new__(cls, name, bases, dct):
attrs = ((name, value) for name, value in dct.items() if not name.startswith('__'))
uppercase_attr = dict((name.upper(), value) for name, value in attrs)
return super(UpperAttrMetaclass, cls).__new__(cls, name, bases, uppercase_attr)
```
通常我们都会使用元类去做一些晦涩的事情,依赖于自省,控制继承等等。确实,用元类来搞些“黑暗魔法”是特别有用的,因而会搞出些复杂的东西来。但就元类本身而言,它们其实是很简单的:
* 拦截类的创建
* 修改类
* 返回修改之后的类

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# 五、使用元类 #
终于到了使用元类了可是一般来说我们根本就用不上它就像Python 界的领袖 Tim Peters 说的:
> 元类就是深度的魔法99% 的用户应该根本不必为此操心。如果你想搞清楚究竟是否需要用到元类,那么你就不需要它。那些实际用到元类的人都非常清楚地知道他们需要做什么,而且根本不需要解释为什么要用元类。
元类的主要用途是创建 API。一个典型的例子是 Django ORM。它允许你像这样定义
```python
class Person(models.Model):
name = models.CharField(max_length=30)
age = models.IntegerField()
```
但是如果你这样做的话:
```python
guy = Person(name='bob', age='35')
print guy.age
```
这并不会返回一个 IntegerField 对象,而是会返回一个 int甚至可以直接从数据库中取出数据。这是有可能的因为 models.Model 定义了 `__metaclass__` 并且使用了一些魔法能够将你刚刚定义的简单的Person类转变成对数据库的一个复杂 hook。Django 框架将这些看起来很复杂的东西通过暴露出一个简单的使用元类的 API 将其化简,通过这个 API 重新创建代码,在背后完成真正的工作。
Python 中的一切都是对象,它们要么是类的实例,要么是元类的实例,除了 type。type 实际上是它自己的元类,在纯 Python 环境中这可不是你能够做到的,这是通过在实现层面耍一些小手段做到的。
参考:
[https://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python](https://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python)
最后如果对本文有兴趣,可以关注公众号:
![公众号](https://user-gold-cdn.xitu.io/2017/7/31/dc2347facde1d4b004faef7de0042b2a)

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# 前言 #
第十二篇了,撸起袖子,就是干。
# 目录 #
![草根学Python十二元类](https://user-gold-cdn.xitu.io/2017/9/7/375f11ec2c4b80ad661187bc63ed8913)