asyncio - python3.5 中使用chain coroutine-PHP中文网问答

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asyncio - python3.5 中使用chain coroutine

怪我咯 2017-04-17 17:54:10

845

想在python3.5实现chain coroutine

#!/usr/bin/env python3.5 import sqlite3 import myslice import json import asyncio conn = sqlite3.connect('db.sqlite') cursor = conn.cursor() def user(): cursor.execute("SELECT user_id, config, password from user") for row in cursor: item = yield row[0], json.loads(row[1]), row[2] @asyncio.coroutine def account(): item = yield from user() user_id = item[0] # print(user_id) # c = yield cursor.execute("SELECT config from account WHERE user_id=%s" %(user_id,)) # print(c) def main(): loop = asyncio.get_event_loop() loop.run_until_complete(account()) if __name__ == '__main__': main()

但是错误是RuntimeError: Task got bad yield:, 不知道怎么解决

怪我咯

走同样的路，发现不同的人生

全部回复 (1)

左手右手慢动作2017-04-17 17:56:10 1 楼

官方chain coroutine的例子是这样的

import asyncio async def compute(x, y): print("Compute %s + %s ..." % (x, y)) await asyncio.sleep(1.0) return x + y async def print_sum(x, y): result = await compute(x, y) print("%s + %s = %s" % (x, y, result)) loop = asyncio.get_event_loop() loop.run_until_complete(print_sum(1, 2)) loop.close()

async 相当于@acyncio.coroutine

很显然楼主的方法达不到实现chain coroutine，　因为协函数要把事情做完的,不能有yield
但可以这样做

#!/usr/bin/env python3.5 import sqlite3 import myslice import json import asyncio conn = sqlite3.connect('db.sqlite') cursor = conn.cursor() @asyncio.coroutine def user(): ret = [] cursor.execute("SELECT user_id, config, password from user") for row in cursor: item = row[0], json.loads(row[1]), row[2] ret.append(item) return ret @asyncio.coroutine def account(): item = await user() user_id = item[0] # print(user_id) # c = yield cursor.execute("SELECT config from account WHERE user_id=%s" %(user_id,)) # print(c) def main(): loop = asyncio.get_event_loop() loop.run_until_complete(account())