# Python程序设计例题

 1 from random import random
2 from math import sqrt
3 from time import clock
4 DARTS=1000
5 hits=0.0
6 clock()
7 for i in range(1,DARTS+1):
8     x,y=random(),random()
9     dist=sqrt(x**2+y**2)
10     if dist<=1.0:
11         hits=hits+1
12 pi=4*(hits/DARTS)
13 print("pi值是{}.".format(pi))
14 print("运行时间是：{:5.5}s".format(clock()))

运行时间是：0.0034431s
[Finished in 0.5s]

import requests
from bs4 import BeautifulSoup
import re

def get_page(url):
try:
kv = {'user-agent':'Mozilla/5.0'}
r.raise_for_status()
r.encoding = r.apparent_encoding
return r.text
except:
return '错误'

def parse_page(html, return_list):
soup = BeautifulSoup(html, 'html.parser')
day_list = soup.find('ul', 't clearfix').find_all('li')
for day in day_list:
date = day.find('h1').get_text()
wea = day.find('p',  'wea').get_text()
if day.find('p', 'tem').find('span'):
hightem = day.find('p', 'tem').find('span').get_text()
else:
hightem = ''
lowtem = day.find('p', 'tem').find('i').get_text()

win = re.findall('(?<= title=").*?(?=")', str(day.find('p','win').find('em')))
wind = '-'.join(win)
level = day.find('p', 'win').find('i').get_text()
return_list.append([date, wea, lowtem, hightem, wind, level])
#return return_list

def print_res(return_list):
tplt = '{0:<10}\t{1:^10}\t{2:^10}\t{3:{6}^10}\t{4:{6}^10}\t{5:{6}^5}'
print(tplt.format('日期', '天气', '最低温', '最高温', '风向', '风力',chr(12288)))
for i in return_list:
print(tplt.format(i[0], i[1],i[2],i[3],i[4],i[5],chr(12288)))

def main():
url = 'http://www.weather.com.cn/weather/101260101.shtml'
html = get_page(url)
wea_list = []
parse_page(html, wea_list)
print_res(wea_list)

if __name__ == '__main__':
main()


运行结果：

例三：输出标题：

1 import requests
2 from bs4 import BeautifulSoup
3 r=requests.get('http://www.baidu.com')
4 r.encoding=None
5 result=r.text
6 bs=BeautifulSoup(result,'html.parser')
7 print(bs.title.text)

[Finished in 1.6s]

posted @ 2019-11-07 18:27  Jokerˇ  阅读(...)  评论(... 编辑 收藏