python3-cookbook

http://python3-cookbook.readthedocs.io/zh_CN/latest/index.html

一般的类找方法，通过MRO找到第一个就停了对吧，可以描述器好像会顺着MRO把所有的方法都执行一遍

原理？？？？

rabbitmq

http://www.rabbitmq.com/tutorials/tutorial-one-go.html

python的xlutils 组件是不是不能处理xlsx格式 的excel?

有人用过python hdfs库或者pyhdfs库么，或者对hadoop熟悉

python 多继承详解

http://www.python.com/html/2013/pythonhexinbiancheng_0828/550.html

python装饰器 == 代码装B神器

class Descriptor:

def init(self, name):

self.name = name

def __get__(self, instance, cls):
    print('getting...')
    if instance is None:
        return self
    else:
        return instance.__dict__[self.name]

def __set__(self, instance, value):
    print("this is Descriptor.__set__")
    instance.__dict__[self.name] = value

def __delete__(self, instance):
    raise AttributeError("Can't delete")

class Typed(Descriptor):

ty = object

def set(self, instance, value):

print("this is Typed.set")

if not isinstance(value, self.ty):

raise TypeError('Expected {}'.format(self.ty))

super().set(instance, value)

class String(Typed):

ty = str

class PosFloat(Float, Positive):

pass

class Sized(Descriptor):

def init(self, args, maxlen, **kwargs):

print("this is in Sized.init")

self.maxlen = maxlen

super().init(args, **kwargs)

def __set__(self, instance, value):
    if len(value) > self.maxlen:
        raise ValueError('Too big')
    super().__set__(instance, value)

class SizedString(String, Sized):

pass

import re

class Regex(Descriptor):

def init(self, args, pat, **kwargs):

print("this is in Regex.init")

self.pat = re.compile(pat)

super().init(args, **kwargs)

def __set__(self, instance, value):
    if not self.pat.match(value):
        raise ValueError('Invalid string')
    super().__set__(instance, value)

class SizedRegexString(String, Sized, Regex):

pass

class Stock(Structure):

_fields = ['name', 'shares', 'price']

name = SizedRegexString('name', maxlen=8, pat='[A-Z]+$')

shares = PosInteger('share')

price = PosFloat('price')

s = Stock('XX', 50, 91.1)

__init__是可以通过__super__来实现，__set__和__get__是不是自带__super__功能啊