整理Py小demo

 from email.mime.text import MIMEText
 # 第一个参数就是邮件正文，第二个参数是MIME的subtype，
 # 传入'plain'表示纯文本，最终的MIME就是'text/plain'，最后一定要用utf-8编码保证多语言兼容性。
 msg=MIMEText('Hello Send By Python123','plain','utf-8')

 import smtplib
 server =smtplib.SMTP_SSL('smtp.qq.com',465)
 server.set_debuglevel(1)
 # essplrlkpwcvbfci
 # server.ehlo()
 # server.starttls()
 server.login('912549963@qq.com','xxxx是邮箱客户端的一列序列号')
 server.sendmail('912549963@qq.com','18437963713@163.com',msg.as_string())
 server.quit()

 # from email.mime.text import MIMEText
 # msg = MIMEText('hello, send by Python5656', 'plain', 'utf-8')
 # import smtplib
 # server = smtplib.SMTP_SSL('smtp.qq.com', 465) # SMTP协议默认端口是25
 # server.set_debuglevel(1)
 # server.ehlo()
 # server.starttls()
 # server.login('912549963@qq.com','nrabssgxathrbfhh')
 # server.sendmail('912549963@qq.com','18437963713@163.com', msg.as_string())
 # server.quit()

邮箱

 # import urllib.request
 # import re
 # import os
 # import urllib
 # #根据给定的网址来获取网页详细信息，得到的html就是网页的源代码
 # def getHtml(url):
 #     page = urllib.request.urlopen(url)
 #     html = page.read()
 #     return html.decode('UTF-8')
 #
 # def getImg(html):
 #     reg = r'src="(.+?\.jpg)" pic_ext'
 #     imgre = re.compile(reg)
 #     imglist = imgre.findall(html)#表示在整个网页中过滤出所有图片的地址，放在imglist中
 #     x = 0
 #     path = 'D:\\test'
 #    # 将图片保存到D:\\test文件夹中，如果没有test文件夹则创建
 #     if not os.path.isdir(path):
 #         os.makedirs(path)
 #     paths = path+'\\'      #保存在test路径下
 #
 #     for imgurl in imglist:
 #         urllib.request.urlretrieve(imgurl,'{}{}.jpg'.format(paths,x))  #打开imglist中保存的图片网址，并下载图片保存在本地，format格式化字符串
 #         x = x + 1
 #     return imglist
 # html = getHtml("http://tieba.baidu.com/p/2460150866")#获取该网址网页详细信息，得到的html就是网页的源代码
 # print (getImg(html)) #从网页源代码中分析并下载保存图片
 #endregion

爬取图片 并存在本地文件夹中

 from flask import Flask # 导入包

 app = Flask(__name__) # 创建一个Web应用

 @app.route('/') # 定义路由(Views)，可以理解为定义页面的URL
 def index():
     return "这是用Python + Flask 搞出来的。" # 渲染页面

 if __name__ == "__main__":
     app.run(host='127.0.0.1',port=8080) # 运行，指定监听地址为 127.0.0.1:8080
 # http://127.0.0.1:8080/  运行这个会返回--》这是用Python + Flask 搞出来的。

创建web应用

if __name__ == '__main__':#这个其实就是在当前模块的时候，_name_的值是__main__，在其他模块引用此模块的话，name的值就是“当前”模块的值。

　　

 import urllib.request
 url='http://www.sogou.com/'
 local_path='E:\download.html'
 urllib.request.urlretrieve(url, local_path)

把整个网页爬出来

 # a=lambda x:x+2#这里的拉姆达表达示被看成一个函数了
 # print(a(1))
 # print(a(2))
 #
 # add = lambda x, y : x+y
 # print(add(1,2) ) # 结果为3

 # y=lambda  a,b,c:(a+b)/c
 # print(str(y(1,5,9))[0:5])

Lambda

 # from bs4 import BeautifulSoup
 # import requests
 # from datetime import datetime
 # import json
 # import re

 # news_url = 'http://news.sina.com.cn/c/nd/2017-05-08/doc-ifyeycfp9368908.shtml'
 # web_data = requests.get(news_url)
 # web_data.encoding = 'utf-8'
 # soup = BeautifulSoup(web_data.text,'lxml')
 # # print(soup.select('a'))
 #
 # links = soup.findAll('a')
 # href=soup.select('.side-tool to-top')
 # print(links)
 # print(href)
 # print(soup.a.string)
 # print(soup.a.attrs)
 # title = soup.select('#artibodyTitle')[0].text
 # a1 = soup.select('a')
 # a = soup.select('a')[0]
 # aa = soup.select('a')[0]['href']
 # print(title)
 # print('----------------------------------------------------')
 #
 # for hrefs in a1:
 #     print(hrefs.text)
 #     print(hrefs)
 #     a= a1.select('a')[2]['href']
 #     print(a)
     # print(hrefs.select('.href'))
 # print(a1)
 # print(a)
 # print(aa)

爬取网页 BeautifulSoup

 from  bs4 import BeautifulSoup
 import requests
 from datetime import datetime
 import json
 import re

 url='http://news.sina.com.cn/c/nd/2017-05-08/doc-ifyeycfp9368908.shtml'
 web_Content=requests.get(url)
 web_Content.encoding='utf-8'
 soup=BeautifulSoup(web_Content.text,'lxml')
 title=soup.select('#artibodyTitle')[0].text

 print(title)

 time = soup.select('.time-source')[0].contents[0].strip()
 dt = datetime.strptime(time,'%Y年%m月%d日%H:%M')
 print(dt)

时间格式化

 class Foo:

     def __init__(self, name, age):
         self.name = name
         self.age = age

     def detail(self):
         print(self.name)
         print(self.age)

 obj1 = Foo('chengd', 18)
 obj1.detail()  # Python默认会将obj1传给self参数，即：obj1.detail(obj1)，所以，此时方法内部的 self ＝ obj1，即：self.name 是 chengd ；self.age 是 18

 # obj2 = Foo('python', 99)
 # obj2.detail()  # Python默认会将obj2传给self参数，即：obj1.detail(obj2)，所以，此时方法内部的 self ＝ obj2，即：self.name 是 python ； self.age 是 99x

函数

 # 在这个函数中Yield 是用来返回值得，就好比return
 # def addlist(alist):
 #     for i in alist:
 #         yield i+1
 #
 # alist=[1,2,3]
 # for x in addlist(alist):
 #     print(x)
 print('----------12121212--------------------------------------------')
 def h():
     print ('To be brave')
     m= yield 5656
     print('Fighting!')
 cc=h()
 mm=cc.__next__()
 # print(cc.__next__())
 print(mm)

 print('------------------78979887--------------------------')
 def h():
     print ('Wen Chuan')
     mm = yield 5555
     print ('Fighting!')

 c = h()
 m = c.__next__()
 print('mm value is ',m)

 print('-------------------------------------------------------------------')
 def h():
     print ('Wen Chuan')
     m = yield 5  # Fighting!
     print (m)
     d = yield 12
     print ('We are together!')
 c = h()
 c.__next__()  #相当于c.send(None)
 c.send('Fighting!')  #(yield 5)表达式被赋予了'Fighting!'

 print('-----------rrrrrrrrrrrrrrrrrrrrrrr----------------------------------------')
 def h():
     print ('Wen Chuan',)
     mm = yield 5  # Fighting!
     print (m)
     ddd = yield 12
     print ('We are together!')
 c = h()
 m = c.__next__()  #m 获取了yield 5 的参数值 5 ---- 可能是遇到的第一个yield的值
 d = c.send('Fighting!')  #d 获取了yield 12 的参数值12 ---- send里的参数会把第一个yield替换掉。然后c.send()获取第二个yield的值
 print ('We will never forget the date', m, '.', d)
 # send(msg) 和 next()是有返回值的，它们的返回值很特殊，返回的是下一个yield表达式的参数

yield Next Send