JoseThree-CSDN博客

转载 urllib库

* ua = random.choice(ua_list) #随机选择一个user-agent信息* request = Request(url) #传奇请求对象* request.add_header('User-Agent', ua) #添加请求头信息* response.read() # 读取返回的内容

2019-07-28 23:35:53 147

原创 lxml,etree简单爬取数据

# //div[@class='billboard-bd']//a/text()import requestsfrom lxml import etreeurl = 'https://movie.douban.com/'headers = {'User-agent':'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTM...

2019-07-27 23:06:37 322

原创 request库

from requests.models import Responseimport requestsurl = 'https://movie.douban.com/'res:Response = requests.request("GET", url, headers={'User-agent':'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWe...

2019-07-27 20:20:05 156

原创 celery

from celery import Celeryapp = Celery()print(app)@app.task(name='myfirsttask')def add(x, y): print('enter ~~~') ret = x + y import time time.sleep(10) return retprint(app...

2019-07-26 17:16:43 91

转载 Django模板技术

Django模板技术urls配置templates/indexDTL语法urls配置from django.template import loaderfrom django.http import JsonResponse, HttpRequest, HttpResponsefrom django.shortcuts import renderdef index(request)...

2019-07-22 19:11:18 131

原创 js的MiXin技术

const A = cls => class extends cls { //函数A返回一个继承自cls的子类 constructor (...arges){ console.log('A') super(...arges); if (typeof (this.stri) !=='function'){ //判断子类是否有stri方...

2019-07-09 22:06:17 262

原创 Promise

var promise = new Promise( function (resolve,reject) { console.log('do some thing') resolve('dit it') console.log('~~~~~~~~~~~') reject('failed') });var p1= ...

2019-07-06 17:54:15 101

原创对象操作

var obj = { a:100, b:200, c:300,}console.log(obj.a,obj.b,obj.c)var new1 = Object.keys(obj)var values = Object.values(obj)var entries = Object.entries(obj)console.log(new1)console....

2019-07-06 16:40:38 161

原创文件拷贝

fn1 = 'E:/test/a1.txt'fn2 = 'E:/test/a2.txt'with open(fn1,'w') as f: f.writelines('\n'.join(['abc','123','xyz']))with open(fn1,'rb') as f1: with open(fn2,'wb') as f2: length = 16*...

2019-07-05 16:38:22 150

原创文件操作os,pathlib

import osfrom pathlib import Pathp = Path('E:/test/')print(list(p.glob('**/*'))) #返回当前目录下的所有内容递归print(os.listdir(p)) #返回当前目录下的所有内容不递归print(os.listdir('E:/test/')) #同上...

2019-07-04 20:29:08 121

原创 JS对象模型

要创建 Point 的新实例，必须使用 new 操作符。以这种方式调用构造函数实际上会经历以下 4个步骤：(1) 创建一个新对象；(2) 将构造函数的作用域赋给新对象（因此 this 就指向了这个新对象）；(3) 执行构造函数中的代码（为这个新对象添加属性）；(4) 返回新对象。老语法function Point (x,y) { // console.log('Poin...

2019-07-01 22:04:14 140

原创 JS函数

递归函数JS里面:const sum = function fn(n){ return n===0 ? 0: n + fn(--n)}console.log(sum(2))Python里面:def foo1(n): # if n == 0: # return 0 # else: # return n + foo1(n-1)...

2019-07-01 19:20:28 98

原创 JS语法

语句块function hello() { let a = 1; var b = 2; c = 3}if (true) { let d = 4; var e = 5; f = 6 if (1) { console.log(d) console.log(e) console.log(f)...

2019-06-30 23:48:12 62

原创 js++--简单运算

let d = --i - i-- - i-- - i // d=-1 i=-1 d=0 i=-2 d= 2 i = -3 d=2+3 i=-3console.log(d, i)let e = ++i + i++ + i++ + i// e= 1 i=1 e=2 i=2 ...

2019-06-29 21:22:11 614

import sqlalchemy, enumfrom sqlalchemy import create_engine, Column, Integer, String, Date, ForeignKey, Enum, and_from sqlalchemy.orm import sessionmaker, relationshipfrom sqlalchemy.ext.declarativ...

2019-06-29 16:35:03 157 1

原创元编程

简单理解:class Meta(type): #type是元类,创建类的类 Meta继承自type,就具备了创造类的功能 def __new__(cls, *args, **kwargs): print(cls) print(args) print(kwargs) name, _, attr = args ...

2019-06-29 13:19:34 161

原创动态规划

求最大子串a = 'xxxxabcd'b = 'abcd'def foo1(a, b): length_a = len(a) length_b = len(b) matrix = [[0]*length_a for _ in range(length_b)] xmax = 0 xindex = 0 for i, x in enumerate(b...

2019-06-27 19:08:35 92

原创 re模块

import re# 取出字符串string8中所有的天气状态string8 = "{ymd:'2018-01-01',tianqi:'晴',aqiInfo:'轻度污染'}," \ "{ymd:'2018-01-02',tianqi:'阴~小雨',aqiInfo:'优'}," \ "{ymd:'2018-01-03',tianqi:'小雨~中雨',aqi...

2019-06-27 09:16:26 73

原创 pymsql事物管理

1,conn 建立连接2,cursor 建立游标3,ping测试4,建立查询语句5,cursor.execute 执行import pymysqlfrom pymysql.cursors import DictCursorconn = pymysql.connect('192.168.106.128', 'xinzhu', '123456', 'test')cursor = co...

2019-06-26 21:22:41 91

原创定义外键约束

定义外键约束:from sqlalchemy import ForeignKey例如:emp_no = Column(Integer, ForeignKey('employees.emp_no', ondelete='CASCADE'), primary_key=True)

2019-06-26 18:05:24 2039

原创 ORM(object relational mapping)

对象关系映射（英语：(Object Relational Mapping，简称ORM))from sqlalchemy import Column, Integer, String, Date, Enum, and_, or_, not_, ForeignKey, create_enginefrom sqlalchemy.ext.declarative import declarative_b...

2019-06-25 15:26:04 128

原创 sql语句

sql语句选择：select * from table1 where 范围插入：insert into table1(field1,field2) values(value1,value2)删除：delete from table1 where 范围更新：update table1 set field1=value1 where 范围查找：select * from table1 whe...

2019-06-24 09:42:17 123

原创 asyncio实现echo服务端

asyncio实现echo服务端async def handle(reader:StreamReader, writer:StreamWriter): while True: writers = [] data = await reader.read(1024) if not data or data == b'quit': ...

2019-06-23 10:51:56 476

原创 selector群聊最终版

selector群聊最终版class A: def __init__(self, ip='127.0.0.1', port=9999): self.addr = ip, port self.sock = socket.socket() self.s = selectors.DefaultSelector() def start(s...

2019-06-19 17:19:39 120

原创 selectors进阶版

代码测试:class A: def __init__(self, ip='127.0.0.1', port=9999): self.addr = ip, port self.sock = socket.socket() self.s = selectors.DefaultSelector() def start(self): ...

2019-06-19 13:29:47 89

原创 selectors简陋版群聊

selectors简陋版群聊s = selectors.DefaultSelector()sock = socket.socket()sock.bind(('127.0.0.1', 9999))sock.listen()logger.info(sock)sock.setblocking(False)def accept(sock, mask): nwsock, ra...

2019-06-19 10:32:43 160

原创 ThreadingTCPServer

测试代码:import threadingfrom socketserver import StreamRequestHandler, ThreadingTCPServerclass A(StreamRequestHandler): clients = {} def setup(self): super().setup() self.cl...

2019-06-17 22:11:56 957

原创 udp客户端,过时删除

测试代码:import socketimport threadingimport datetimeclass A: def __init__(self, ip='127.0.0.1', port=9999, interval=10): self.addr = ip, port self.sock = socket.socket(type=socke...

2019-06-17 21:37:14 143

原创 socket编程

测试代码class A: def __init__(self, ip='127.0.0.1', port=9999): self.addr = ip, port self.sock = socket.socket() self.event = threading.Event() self.lock = threading.L...

2019-06-14 20:23:59 106

原创 osi参考模型对应协议

TCP/IP是网络上数据通信的一种协议，如果没有这个协议，你就在TCP/IP 网络上什么也做不了HTTP协议是TCP/IP 协议里面包含的应用层的协议而已，没有这个协议只是不能浏览网页而已，其他的服务是正常的比如邮件SMTP，POP3 协议，FTP等协议，这些协议都是应用层协议TCP/IP协议里有链接层，网络层，传输层，应用层（HTTP协议就包含在应用层里的一个协议）TCP/...

2019-06-14 19:03:50 1662

原创 logging模块

logging模块import loggingimport sysa = logging.getLogger('a') #get一个handlerprint(a.level) #初始的等级是0a.level = 20print(a.handlers)...

2019-06-11 22:28:43 82

原创进程池和线程池的使用

进程池和线程池的使用from concurrent.futures import ThreadPoolExecutor,ProcessPoolExecutorimport loggingimport datetimeimport timeimport threadinga = '%(asctime)s %(message)s'logging.basicConfig(level=log...

2019-06-11 13:35:11 104

原创多进程

多进程import multiprocessingimport loggingimport threadingimport datetimea = '%(asctime)s %(process)s %(processName)s %(threadName)s %(thread)8d %(message)s'logging.basicConfig(level=logging.INFO, ...

2019-06-10 23:04:00 61

原创魔术方法setattr和getattr

__setattr____setattr__设置实例的属性存放在哪里,在调用时,在init方法之前例如:class A: d = {} def __init__(self,x,y): self.x = x self.y = y self.d['x'] = x self.d['y'] = y def __...

2019-05-26 20:32:03 187

原创用类实现注册函数

例:def asd(): print('666')class A: def __init__(self): self.x = lambda :print('1') self.y = lambda :print('2') self.z = lambda :print('3') self.asd = asd...

2019-05-26 17:06:13 328

原创上下文管理,调用call函数,装饰一个函数

上下文管理,调用call函数例:def add3(x,y): time.sleep(1) return x + yclass Timeit: def __init__(self,fn): self.fn = fn def __enter__(self): self.start = datetime.datetime.now(...

2019-05-26 11:34:46 65

原创上下文管理,装饰一个函数

例:import datetimeimport timefrom functools import wraps,update_wrapperdef logger3(duration=3): def _logger3(fn): @wraps(fn) def inner(*args,**kwargs): start = dat...

2019-05-26 11:13:33 56

原创函数,装饰一个函数

装饰器例:import datetimeimport timedef logger3(duration=3): def _logger3(fn): def inner(*args,**kwargs): start = datetime.datetime.now() ret = fn(*args,**kwargs) ...

2019-05-26 10:56:39 49

原创类,装饰一个函数

类装饰器例:import datetimeimport timefrom functools import update_wrapperclass Logger3: '''this is logger3''' def __init__(self,fn): self.fn = fn update_wrapper(self,fn) ...

2019-05-26 10:46:38 97

原创特殊属性dir()

魔术方法`__dir__`实例化一个类,dir(?),会显示什么?__dir__import导入什么当前模块dir()里面就添加进什么(见例1)dir()收集类的所有属性,包括继承类(祖先类)见例2例1:class A: def __init__(self): self.a = 5print('in 01',dir())a = A()from zs0...

2019-05-22 23:35:02 170

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