Python 复习

class Car(object):    country = u'中国'    def __init__(self, length, width, height, owner=None):        self.owner = owner        self.length = length        self.width = width        self.height = height        self.country = "china"

class Car(object):    country = u'中国'    def __init__(self, owner=None):        self._owner = owner            @property    def owner(self):        return self._owner    @owner.setter    def owner(self, value):        self._owner = value    @owner.deleter    def owner(self):        self._owner = None

#!/usr/bin/env python# -*- coding: utf-8 -*-#copyRight by heibankeclass Car(object):    country = u'中国'    __slots__=('length','width','height','owner','__dict__')        def __init__(self, length, width, height, owner=None):        self.owner = owner        self.length = length        self.width = width        self.height = height            def __getattr__(self,name): # 没找到的时候调用        print "__getattr__",name        return self.__dict__.get(name,None)            def __setattr__(self,name,value):        print "__setattr__",name        if name!='owner':            assert value>0, name+" must larger than 0"        self.__dict__[name]=value            def __delattr__(self,name):        print "__delattr__",name        if name=='owner':            self.__dict__[name]=None

A = type('A', (object,), {'b': 1})a = A()

class final(type):    def __init__(cls,name,bases,namespaces):        super(final, cls).__init__(name, bases, atts)        for klass in bases:            assert not isinstance(klass, final)

#!/usr/bin/env python# coding: utf-8#copyRight by heibanke# 
1. 从现在开始1000天后和1000天前是哪一天
import datetimea=datetime.date.today()b=datetime.datetime.now()d1=datetime.
timedelta(days=1000)d2=datetime.
timedelta(hours=1000)(a-d1).isoformat()(a+d1).strftime('%m/%d/%Y')b.isoformat()(b-d2)# 
2. 离你的重要纪念日还有多少天important_day=datetime.datetime.
strptime('2008-06-18','%Y-%m-%d') important_day>bd3=b-important_dayd3.dayst=datetime.time(12,11,30)# 
3. 两段程序哪个快些############## time.time and time.clock
 ####################import timea=input("please input 0 or 1:")
 start_time = time.time()start_clock = time.clock()if a:    sum_i=0    for i in range(100000):     
    sum_i+=ielse:    sum_i=sum(range(100000))
    print sum_itime.sleep(2)end_time = time.time()end_clock = time.clock()
    print "time-delta:"print start_time-end_timeprint "clock-delta:"print start_clock-end_clock

#!/usr/bin/env python# coding: utf-8#copyRight by heibanke# 1. 从现在开始1000天后和1000天前是哪一天import datetimea=datetime.date.today()b=datetime.datetime.now()d1=datetime.timedelta(days=1000)d2=datetime.timedelta(hours=1000)(a-d1).isoformat()(a+d1).strftime('%m/%d/%Y')b.isoformat()(b-d2)# 2. 离你的重要纪念日还有多少天important_day=datetime.datetime.strptime('2008-06-18','%Y-%m-%d') important_day>bd3=b-important_dayd3.dayst=datetime.time(12,11,30)# 3. 两段程序哪个快些############## time.time and time.clock ####################import timea=input("please input 0 or 1:")start_time = time.time()start_clock = time.clock()if a:    sum_i=0    for i in range(100000):        sum_i+=ielse:    sum_i=sum(range(100000))print sum_itime.sleep(2)end_time = time.time()end_clock = time.clock()print "time-delta:"print start_time-end_timeprint "clock-delta:"print start_clock-end_clock