import threading,time
print('第一线程（默认）：程序开始啦！')
def takeANap():time.sleep(5)print('第二线程：5秒到，我醒来啦！')#创建并启动多线程
t=threading.Thread(target=takeANap)
t.start()print('第一线程（默认）：程序结束啦！')'''
输出：
第一线程（默认）：程序开始啦！
第一线程（默认）：程序结束啦！
>>> 第二线程：5秒到，我醒来啦！
'''

import threading##多线程传递多参数print('Cats','Dogs','Frogs',sep='&')=>Cats & Dogs & Frogs：
threadObj = threading.Thread(target=print, args=['Cats', 'Dogs', 'Frogs'],kwargs={'sep': ' & '})
threadObj.start()##输出：Cats & Dogs & Frogs

#! python3
# multidownloadXkcd.py - Downloads XKCD comics using multiple threads.import requests, os, bs4, threading
os.makedirs('xkcd', exist_ok=True) # store comics in ./xkcddef downloadXkcd(startComic, endComic):for urlNumber in range(startComic, endComic):# Download the page.print('Downloading page http://xkcd.com/%s...' % (urlNumber))res = requests.get('http://xkcd.com/%s' % (urlNumber))res.raise_for_status()soup = bs4.BeautifulSoup(res.text)# Find the URL of the comic image.comicElem = soup.select('#comic img')if comicElem == []:print('Could not find comic image.')else:comicUrl = comicElem[0].get('src')# Download the image.print('Downloading image %s...' % (comicUrl))res = requests.get(comicUrl)res.raise_for_status()# Save the image to ./xkcdimageFile = open(os.path.join('xkcd', os.path.basename(comicUrl)), 'wb')for chunk in res.iter_content(100000):imageFile.write(chunk)imageFile.close()# Create and start the Thread objects.
downloadThreads = [] # a list of all the Thread objects
for i in range(0, 1400, 100): # loops 14 times, creates 14 threadsdownloadThread = threading.Thread(target=downloadXkcd, args=(i, i + 99))downloadThreads.append(downloadThread)downloadThread.start()# Wait for all threads to end.
for downloadThread in downloadThreads:downloadThread.join()
print('Done.')