pythonのgevent同步异步区别

 #!/usr/bin/env python

 from urllib import  request
 import  gevent
 from gevent import monkey
 import time

 monkey.patch_all() # 把当前程序所有的IO操作给我单独的做上标记。
 def f(url):
     resp = request.urlopen(url)
     data = resp.read()
     print(len(data))

 urls = ["https://www.python.org",
         "https://www.yahoo.com",
         "https://github.com"
         ]
 time_start = time.time()
 for url in urls:
     f(url)
 print("同步花费时间：",time.time()-time_start)

 asy_time = time.time()
 gevent.joinall({
     gevent.spawn(f,"https://www.python.org"),
     gevent.spawn(f,"https://www.yahoo.com"),
     gevent.spawn(f,"https://github.com"),
 })
 print("异步花费时间：",time.time()-asy_time)

C:\Users\Administrator\AppData\Local\Programs\Python\Python37\python.exe D:/PythonStudy/charm/01/day10/爬虫.py
48822
479812
64096
同步花费时间： 4.925281763076782
48822
64096
477025
异步花费时间： 3.1961827278137207

Process finished with exit code 0