Python使用grequests(gevent+requests)并发发送请求过程解析

import grequests
req_list = [  # 请求列表
  grequests.get('http://httpbin.org/get?a=1&b=2'),
  grequests.post('http://httpbin.org/post', data={'a':1,'b':2}),
  grequests.put('http://httpbin.org/post', json={'a': 1, 'b': 2}),
]
res_list = grequests.map(req_list)  # 并行发送，等最后一个运行完后返回
print(res_list[0].text) # 打印第一个请求的响应文本

import requests
import time
start = time.time()
res_list = [requests.get('https://github.com') for i in range(100)]
print(time.time()-start)

import grequests
import time

start = time.time()
req_list = [grequests.get('https://github.com') for i in range(100)]
res_list = grequests.map(req_list)
print(time.time()-start)

import grequests
def err_handler(request, exception):
  print("请求出错")
req_list = [
  grequests.get('http://httpbin.org/delay/1', timeout=0.001),  # 超时异常
  grequests.get('http://fakedomain/'),  # 该域名不存在
  grequests.get('http://httpbin.org/status/500')  # 正常返回500的请求
]
res_list = grequests.map(reqs, exception_handler=err_handler)
print(res_list)

请求出错
请求出错
[None, None, <Response [500]>]