I’m building a Telegram reminder for Duolingo practice and hit a missing event loop error. See the revised code snippet below:
import asyncio
from telegram.ext import Application, CommandHandler
async def hello(update, context):
await update.message.reply_text('Hi! Time for your Duolingo session.')
async def run_bot():
app = Application.builder().token('YOUR_TOKEN').build()
app.add_handler(CommandHandler('hello', hello))
await app.run_polling()
if __name__ == '__main__':
asyncio.run(run_bot())
After some investigation on similar issues, I discovered that the missing event loop error can stem from running the bot in an environment that already has an event loop running, such as within some interactive environments or certain IDEs. In my experience, running the script directly from a standard terminal solves the problem. Additionally, it is helpful to ensure that all asynchronous handlers are initialized only after the event loop is confirmed active. Adjusting the runtime environment resolved the error in my case.
hey, try passinf loop=asyncio.get_event_loop() to your Application builder. i solved a similar issue by ensuring my env wasn’t already runnung a loop. run it in terminal if possible. good luck!