我的aiohttp webserver使用随时间变化的全局变量：

from aiohttp import web    

shared_item = 'bla'

async def handle(request):
    if items['test'] == 'val':
        shared_item = 'doeda'
    print(shared_item)

app = web.Application()
app.router.add_get('/', handle)
web.run_app(app, host='somewhere.com', port=8181)

结果是：

UnboundLocalError: local variable ‘shared_item’ referenced before assignment

我如何正确使用共享变量shared_item？

解决方法:

将共享变量推送到应用程序的上下文中：

async def handle(request):
    if items['test'] == 'val':
        request.app['shared_item'] = 'doeda'
    print(request.app['shared_item'])

app = web.Application()
app['shared_item'] = 'bla'