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  • Python程序设计例题

    例一:蒙特卡罗方法求解 π 值

     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()))

    运行结果:pi值是3.216.

         运行时间是:0.0034431s
                     [Finished in 0.5s]

    例二:贵阳天气:

    原文:https://blog.csdn.net/weixin_42358077/article/details/95188483

    import requests
    from bs4 import BeautifulSoup
    import re
    
    def get_page(url):
        try:
            kv = {'user-agent':'Mozilla/5.0'}
            r = requests.get(url,headers = kv)
            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}	{1:^10}	{2:^10}	{3:{6}^10}	{4:{6}^10}	{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)

    运行结果:

    百度一下,你就知道
    [Finished in 1.6s]

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  • 原文地址:https://www.cnblogs.com/Wang1107/p/11814117.html
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