吴裕雄 实战PYTHON编程（4）

import hashlib

md5 = hashlib.md5()
md5.update(b'Test String')
print(md5.hexdigest())

import hashlib

md5 = hashlib.md5(b'Test String').hexdigest()
print(md5)

import os
import hashlib
import requests

# url = "http://opendata.epa.gov.tw/ws/Data/REWXQA/?$orderby=SiteName&$skip=0&$top=1000&format=json"
url = "https://www.baidu.com"

# 读取网页原始码
html=requests.get(url).text.encode('utf-8-sig')
# 判断网页是否更新
md5 = hashlib.md5(html).hexdigest()
if os.path.exists('F:\\pythonBase\\pythonex\\ch06\\old_md5.txt'):
with open('F:\\pythonBase\\pythonex\\ch06\\old_md5.txt', 'r') as f:
old_md5 = f.read()
with open('F:\\pythonBase\\pythonex\\ch06\\old_md5.txt', 'w') as f:
f.write(md5)
else:
with open('F:\\pythonBase\\pythonex\\ch06\\old_md5.txt', 'w') as f:
f.write(md5)

if md5 != old_md5:
print('数据已更新...')
else:
print('数据未更新，从数据库读取...')

import os
import ast
import hashlib
import sqlite3
import requests

from bs4 import BeautifulSoup

conn = sqlite3.connect('F:\\pythonBase\\pythonex\\DataBasePM25.sqlite') # 建立数据库连接
cursor = conn.cursor() # 建立 cursor 对象

# 建立一个数据表
sqlstr='''
CREATE TABLE IF NOT EXISTS TablePM25 ("no" INTEGER PRIMARY KEY AUTOINCREMENT
NOT NULL UNIQUE ,"SiteName" TEXT NOT NULL ,"PM25" INTEGER)
'''
cursor.execute(sqlstr)

url = "http://api.help.bj.cn/apis/aqilist/"
#html=requests.get(url).text.encode('utf-8-sig') # 读取网页原始码
html=requests.get(url).text.encode('iso-8859-1').decode('utf-8-sig')
# print(html)
html = html.encode('utf-8-sig')
# 判断网页是否更新
md5 = hashlib.md5(html).hexdigest()
old_md5 = ""

if os.path.exists('F:\\pythonBase\\pythonex\\ch06\\old_md5-.txt'):
with open('F:\\pythonBase\\pythonex\ch06\\old_md5-.txt', 'r') as f:
old_md5 = f.read()
with open('F:\\pythonBase\\pythonex\ch06\\old_md5-.txt', 'w') as f:
f.write(md5)
print("old_md5="+old_md5+";"+"md5="+md5) #显示新老md5码进行观察
if md5 != old_md5:
print('数据已更新...')
sp=BeautifulSoup(html,'html.parser') #解析网页内容
jsondata = ast.literal_eval（sp.text) #此时jscondata取到的是字典类型数据
# 删除数据表内容
js1=jsondata.get("aqidata") #取出字典数据中的aqidata项的值（值是列表）
conn.execute("delete from TablePM25")
conn.commit()
n=1
for city in js1: #city此时是列表js1中的第一条字典数据
CityName=city["city"] #取出city字典数据中的值为"city"的key
if(city["pm2_5"] == ""):
PM25=0
else: #如果city字典中的key对应的value为空，则PM25=0,否则，把PM25=value
PM25=int(city["pm2_5"])
print("城市:{} PM2.5={}".format(CityName,PM25)) #显示城市对应的名称与PM2.5值
# 新增一笔记录
sqlstr="insert into TablePM25 values({},'{}',{})" .format(n,CityName,PM25)
cursor.execute(sqlstr)
n+=1
conn.commit() # 主动更新
else:
print('数据未更新，从数据库读取...')
cursor=conn.execute("select * from TablePM25")
rows=cursor.fetchall()
for row in rows:
print("城市:{} PM2.5={}".format(row[1],row[2]))

conn.close() # 关闭数据库连

import os
import ast
import hashlib
import sqlite3
import requests

from bs4 import BeautifulSoup

# cur_path=os.path.dirname(__file__) # 取得目前路径
# print(cur_path)
conn = sqlite3.connect('F:\\pythonBase\\pythonex\\' + 'DataBasePM25.sqlite') # 建立数据库连接
cursor = conn.cursor() # 建立 cursor 对象

# 建立一个数据表
sqlstr='''
CREATE TABLE IF NOT EXISTS TablePM25 ("no" INTEGER PRIMARY KEY AUTOINCREMENT
NOT NULL UNIQUE ,"SiteName" TEXT NOT NULL ,"PM25" INTEGER)
'''
cursor.execute(sqlstr)

url = "http://api.help.bj.cn/apis/aqilist/"
# 读取网页原始码
# html=requests.get(url).text.encode('utf-8-sig')
html=requests.get(url).text.encode('iso-8859-1').decode('utf-8-sig')
# print(html)
html = html.encode('utf-8-sig')

print('数据已更新...')
sp=BeautifulSoup(html,'html.parser') #sp是bs4.Beautifulsoup类
# 将网页内转换为 list,list 中的元素是 dict
jsondata = ast.literal_eval（sp.text) #把sp.text字符串转为dict类型
js=jsondata.get("aqidata") #从jasondata中取出值为"aqidata"的key对应的value的列表

# 删除数据表内容
conn.execute("delete from TablePM25")
conn.commit()

#把抓到的数据逐条存到数据库
n=1
for city in js:
CityName=city["city"]
PM25=0 if city["pm2_5"] == "" else int(city["pm2_5"])
print("城市:{} PM2.5={}".format(CityName,PM25))
# 新增一条记录
sqlstr="insert into TablePM25 values({},'{}',{})" .format(n,CityName,PM25)
cursor.execute(sqlstr)
n+=1
conn.commit() # 主动更新
conn.close() # 关闭数据库连

from time import sleep
from selenium import webdriver

urls = ['http://www.baidu.com','http://www.wsbookshow.com','http://news.sina.com.cn/']

browser = webdriver.Chrome()
browser.maximize_window
for url in urls:
browser.get(url)
sleep(3)

browser.quit()

from selenium import webdriver #导入webdriver

url='http://www.wsbookshow.com/bookshow/jc/bk/cxsj/12442.html' #以此链接为例
browser=webdriver.Chrome() #生成Chrome浏览器对象(结果是打开Chrome浏览器)
browser.get(url) #在浏览器中打开url
login_form=browser.find_element_by_id("menu_1") ##查找id="menu_1"的元素
print(login_form.text) #显示元素内容
#browser.quit() #退出浏览器，退出驱动程序
username=browser.find_element_by_name("username") #查找name="username"的元素
print(username)
password=browser.find_element_by_name("pwd") #查找name="pwd"的元素
print(password)
login_form=browser.find_element_by_xpath("//input[@name='arcID']")
print(login_form)
login_form=browser.find_element_by_xpath("//div[@id='feedback_userbox']")
print(login_form)
continue_link=browser.find_element_by_link_text('新概念美语')
print(continue_link)
continue_link=browser.find_element_by_link_text('英语')
print(continue_link)
heading1=browser.find_element_by_tag_name('h1')
print(heading1)
content=browser.find_elements_by_class_name('topbanner')
print(content)
content=browser.find_elements_by_css_selector('.topsearch')
print(content)
# print(content.get_property)
print()
browser.quit() #退出浏览器，退出驱动程序

from selenium import webdriver
from time import sleep

url = 'http://www.51cto.com/'

browser = webdriver.Chrome()
browser.maximize_window
browser.get(url)

browser.find_element_by_xpath('//*[@id="login_status"]/a[1]').click() #获取“登录”元素
browser.find_element_by_xpath('//*[@id="loginform-username"]').clear()#清空输入框
browser.find_element_by_xpath('//*[@id="loginform-username"]').send_keys('oomms') #填写用户名
browser.find_element_by_xpath('//*[@id="loginform-password"]').clear() #清空输入框
browser.find_element_by_xpath('//*[@id="loginform-password"]').send_keys('abc123') #填写密码
sleep(3) #加入等待
browser.find_element_by_xpath('//*[@id="login-form"]/div[3]/input').click() #单击“登录”按钮