app.py

app.py

from aiohttp import web
from aiohttp_catcher import catch, Catcher

async def divide(request):
  quotient = int(request.query.get("x")) / int(request.query.get("y"))
  return web.json_response(data={"quotient": quotient})

msg = "Zero division makes zero sense"

async def main():
  catcher = Catcher()
  await catcher.add_scenario(
    catch(ZeroDivisionError).with_status_code(400).and_return(msg)
  )
  # Register your catcher as an aiohttp middleware:
  app = web.Application(middlewares=[catcher.middleware])
  app.add_routes([web.get("/divide", divide)])
  web.run_app(app)