协程：在一个线程内指定切换
协程+异步IO
aiohttp asyncio 模块
封装http数据包 异步IO
"""
可以实现并发
但是，请求发送出去后和返回之前，中间时期进程空闲
编写方式：
- 直接返回处理
- 通过回调函数处理
"""
########### 编写方式一 ###########
"""
from concurrent.futures import ProcessPoolExecutor
import requests
import time
def task(url):
response = requests.get(url)
print(url,response)
# 写正则表达式
pool = ProcessPoolExecutor(7)
url_list = [
'http://www.cnblogs.com/wupeiqi',
'http://huaban.com/favorite/beauty/',
'http://www.bing.com',
'http://www.zhihu.com',
'http://www.sina.com',
'http://www.baidu.com',
'http://www.autohome.com.cn',
]
for url in url_list:
pool.submit(task,url)
pool.shutdown(wait=True)
"""
########### 编写方式二 ###########
from concurrent.futures import ProcessPoolExecutor
import requests
import time
def task(url):
response = requests.get(url)
return response
def done(future,*args,**kwargs):
response = future.result()
print(response.status_code,response.content)
pool = ProcessPoolExecutor(7)
url_list = [
'http://www.cnblogs.com/wupeiqi',
'http://huaban.com/favorite/beauty/',
'http://www.bing.com',
'http://www.zhihu.com',
'http://www.sina.com',
'http://www.baidu.com',
'http://www.autohome.com.cn',
]
for url in url_list:
v = pool.submit(task,url)
v.add_done_callback(done)
pool.shutdown(wait=True)
import asyncio
"""
@asyncio.coroutine
def task():
print('before...task......')
yield from asyncio.sleep(5) # 发送Http请求，支持TCP获取结果..
print('end...task......')
tasks = [task(), task()]
loop = asyncio.get_event_loop()
loop.run_until_complete(asyncio.gather(*tasks))
loop.close()
"""
"""
import asyncio
@asyncio.coroutine
def task(host, url='/'):
print('start',host,url)
reader, writer = yield from asyncio.open_connection(host, 80)
request_header_content = "GET %s HTTP/1.0\r\nHost: %s\r\n\r\n" % (url, host,)
request_header_content = bytes(request_header_content, encoding='utf-8')
writer.write(request_header_content)
yield from writer.drain()
text = yield from reader.read()
print('end',host, url, text)
writer.close()
tasks = [
task('www.cnblogs.com', '/wupeiqi/'),
task('dig.chouti.com', '/pic/show?nid=4073644713430508&lid=10273091')
]
loop = asyncio.get_event_loop()
results = loop.run_until_complete(asyncio.gather(*tasks))
loop.close()
"""
"""
import aiohttp
import asyncio
@asyncio.coroutine
def fetch_async(url):
print(url)
response = yield from aiohttp.request('GET', url)
print(url, response)
response.close()
tasks = [fetch_async('http://www.baidu.com/'), fetch_async('http://www.chouti.com/')]
event_loop = asyncio.get_event_loop()
results = event_loop.run_until_complete(asyncio.gather(*tasks))
event_loop.close()
"""
import asyncio
import requests
@asyncio.coroutine
def task(func, *args):
print(func,args)
loop = asyncio.get_event_loop()
future = loop.run_in_executor(None, func, *args) # requests.get('http://www.cnblogs.com/wupeiqi/')
response = yield from future
print(response.url, response.content)
tasks = [
task(requests.get, 'http://www.cnblogs.com/wupeiqi/'),
task(requests.get, 'http://dig.chouti.com/pic/show?nid=4073644713430508&lid=10273091')
]
loop = asyncio.get_event_loop()
results = loop.run_until_complete(asyncio.gather(*tasks))
loop.close()
