开启线程池和进程池

import requests, time
from bs4 import BeautifulSoup
from concurrent.futures import ThreadPoolExecutor, ProcessPoolExecutor, as_completed



URLS = [
    'http://www.baidu.com',
    'http://www.bing.com',
    'http://wwww.sougou.com',
    'http://www.soso.com'
]

def get_page_title(url, timeout): 
    '''得到页面的标题'''
    html = requests.get(       # 使用requests发送get请求
        url=url,
        timeout=timeout,
        headers = {
            'User-Agent': 'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:51.0) Gecko/20100101 Firefox/51.0'
        }
    )
#     print(html.text)
    soup = BeautifulSoup(html.text, "html.parser")  # 解析文档
    title = soup.find('title')    # 得到页面的标题
    return title.text



with ThreadPoolExecutor(max_workers=4) as excutor:    # 使用with得到一个最大线程数为4的线程池
    start = time.time()                               
    future_and_url = {excutor.submit(get_page_title, url, 10):url for url in URLS} # 提交任务
    for future in as_completed(future_and_url):  # 使用as_completed返回一个已完成任务的迭代器
        url = future_and_url[future]
        try:
            data = future.result()   # 得到任务的结果
        except Exception as e:
            print("has occured exception:", e)
        else:
            cost_time = time.time() - start
            print("got title:%s"%data, 'spend %ss'%cost_time)

got title:百度一下，你就知道 spend 0.28019237518310547s
got title:搜狗搜索引擎 - 上网从搜狗开始 spend 0.3059103488922119s
got title:搜狗®宠物 | 热门论谈 spend 1.7201545238494873s
got title:微软必应搜索 - 全球搜索，有问必应 (Bing) spend 10.456863164901733s

def is_perfect_number(number):
    '''判断是否为完美数'''
    sum = 0
    for i in range(1,number):
        if number%i == 0:
             sum += i
    if sum == number:
        return True
    return False



def find_perfect_number_t(number):
    '''利用线程寻找这个数字范围内所有的完美数'''
    perfect_number = []
    start_time = time.time()
    with ThreadPoolExecutor() as executor:
        future_dict = {executor.submit(is_perfect_number, i): i for i in range(1, number)}
  
        for future in as_completed(future_dict):
            if future.result():
                perfect_number.append(future_dict[future])
        print('The perfect number of %s is:'%number, perfect_number)
    print('has spend %ss'%(time.time()-start_time))

find_perfect_number_t(25000)

The perfect number of 25000 is: [6, 28, 496, 8128]
has spend 134.63016271591187s

def find_perfect_number_p(number):
    '''利用进程寻找这个数字范围内所有的完美数'''
    perfect_number = []
    start_time = time.time()
    with ProcessPoolExecutor() as executor:
        future_dict = {executor.submit(is_perfect_number, i): i for i in range(1, number)}
  
        for future in as_completed(future_dict):
            if future.result():
                perfect_number.append(future_dict[future])
        print('The perfect number of %s is:'%number, perf

find_perfect_number_p(25000)

The perfect number of 25000 is: [6, 496, 28, 8128]
has spend 45.46505379676819s