我尝试了python请求库文档中提供的示例。
使用async.map(rs),我获得了响应代码,但我想获得所请求的每个页面的内容。例如,这是行不通的:
out = async.map(rs)
print out[0].content
我尝试了python请求库文档中提供的示例。
使用async.map(rs),我获得了响应代码,但我想获得所请求的每个页面的内容。例如,这是行不通的:
out = async.map(rs)
print out[0].content
当前回答
也许请求-期货是另一种选择。
from requests_futures.sessions import FuturesSession
session = FuturesSession()
# first request is started in background
future_one = session.get('http://httpbin.org/get')
# second requests is started immediately
future_two = session.get('http://httpbin.org/get?foo=bar')
# wait for the first request to complete, if it hasn't already
response_one = future_one.result()
print('response one status: {0}'.format(response_one.status_code))
print(response_one.content)
# wait for the second request to complete, if it hasn't already
response_two = future_two.result()
print('response two status: {0}'.format(response_two.status_code))
print(response_two.content)
办公文档中也有建议。如果你不想卷入gevent,这是一个不错的选择。
其他回答
我测试了两个请求——未来请求和请求请求。Grequests速度更快,但会带来猴子补丁和依赖关系的其他问题。请求-期货比请求慢几倍。我决定编写自己的请求,并简单地将请求包装到ThreadPoolExecutor中,它几乎和grequest一样快,但没有外部依赖。
import requests
import concurrent.futures
def get_urls():
return ["url1","url2"]
def load_url(url, timeout):
return requests.get(url, timeout = timeout)
with concurrent.futures.ThreadPoolExecutor(max_workers=20) as executor:
future_to_url = {executor.submit(load_url, url, 10): url for url in get_urls()}
for future in concurrent.futures.as_completed(future_to_url):
url = future_to_url[future]
try:
data = future.result()
except Exception as exc:
resp_err = resp_err + 1
else:
resp_ok = resp_ok + 1
我也尝试过使用python中的异步方法做一些事情,然而我使用twisted进行异步编程的运气要好得多。它的问题较少,并且有良好的文档记录。这里有一个类似于你在twisted中尝试的东西的链接。
http://pythonquirks.blogspot.com/2011/04/twisted-asynchronous-http-request.html
上面的答案都没有帮助我,因为他们假设你有一个预定义的请求列表,而在我的情况下,我需要能够侦听请求和异步响应(类似于它在nodejs中的工作方式)。
def handle_finished_request(r, **kwargs):
print(r)
# while True:
def main():
while True:
address = listen_to_new_msg() # based on your server
# schedule async requests and run 'handle_finished_request' on response
req = grequests.get(address, timeout=1, hooks=dict(response=handle_finished_request))
job = grequests.send(req) # does not block! for more info see https://stackoverflow.com/a/16016635/10577976
main()
handle_finished_request回调函数将在收到响应时被调用。注意:由于某些原因,超时(或无响应)在这里不会触发错误
这个简单的循环可以触发异步请求,类似于它在nodejs服务器中的工作方式
Note
下面的答案不适用于v0.13.0+请求。在写完这个问题之后,异步功能被移到了请求中。但是,您可以用下面的请求替换请求,它应该可以工作。
我保留这个答案,以反映最初的问题,即使用请求< v0.13.0。
异步完成多个任务。异步映射你必须:
为每个对象(任务)定义一个函数 将该函数作为事件钩子添加到请求中 调用异步。映射到所有请求/操作的列表上
例子:
from requests import async
# If using requests > v0.13.0, use
# from grequests import async
urls = [
'http://python-requests.org',
'http://httpbin.org',
'http://python-guide.org',
'http://kennethreitz.com'
]
# A simple task to do to each response object
def do_something(response):
print response.url
# A list to hold our things to do via async
async_list = []
for u in urls:
# The "hooks = {..." part is where you define what you want to do
#
# Note the lack of parentheses following do_something, this is
# because the response will be used as the first argument automatically
action_item = async.get(u, hooks = {'response' : do_something})
# Add the task to our list of things to do via async
async_list.append(action_item)
# Do our list of things to do via async
async.map(async_list)
我知道这已经关闭了一段时间,但我认为推广另一种基于请求库的异步解决方案可能是有用的。
list_of_requests = ['http://moop.com', 'http://doop.com', ...]
from simple_requests import Requests
for response in Requests().swarm(list_of_requests):
print response.content
文档在这里:http://pythonhosted.org/simple-requests/