simple callback wrapper for python
This repo is a toy project for simulating callback experience like JavaScript.
callback is a basic design in JavaScript (Node), which providing high performance IO experience:
request.upload({
url: 'http://www.example.com',
data: [
{
name: 'param1',
value: 'value1'
}
],
success: function(data) {
console.log('handling success')
},
fail: function(data, code) {
console.log(`handling fail, code = ${code}`)
}
})Of course we can simply simulate something like that in Python:
from pycallback import callback
import asyncio
import aiohttp
import time
def success_cb(result):
# or, save these result to db?
print(f"result is {result}")
def error_cb(err):
print(err)
@callback(success=success_cb, fail=error_cb)
async def haha():
start = time.time()
async with aiohttp.ClientSession() as session:
async with session.get('http://www.baidu.com') as response:
resp = await response.text()
cost = time.time() - start
return cost, resp
async def main():
# Schedule three calls *concurrently*:
await asyncio.gather(
haha(),
haha(),
haha(),
)
asyncio.run(main())For better performance, we built it with asyncio. Here is a simpler example for understanding asyncio:
import asyncio
async def haha(wait_time):
await asyncio.sleep(wait_time)
return wait_time
async def main():
# Schedule three calls *concurrently*:
await asyncio.gather(
haha(1),
haha(2),
haha(3),
)
asyncio.run(main())