1 import asyncio
2 from asyncio import Lock, Queue
3 cache = {}
4 lock = Lock()
5
6
7 async def get_stuff(url):
8 # lock.acquire()是一个协程
9 # await lock.acquire()
10 # with await lock
11 # Lock实现了__enter__和__exit__可以使用with语法
12 async with lock:
13 if url in cache:
14 return cache[url]
15 stuff = await aiohttp.request('GET', url)
16 cache[url] = stuff
17 return stuff
18
19
20 async def parse_stuff():
21 stuff = await get_stuff()
22 # do some parsing
23
24
25 async def use_stuff():
26 stuff = await get_stuff()
27 # use stuff to do something interesting
28
29
30 if __name__ == '__main__':
31 tasks = [parse_stuff(), use_stuff()]
32 loop = asyncio.get_event_loop()
33 loop.run_until_complete(asyncio.wait(tasks))
