Deploying on Heroku. ModuleNotFoundError: No module named 'uvloop'

[westerntrix]

Received a ModuleNotFoundError: No module named uvloop when deploying my app to Heroku..

Not sure if this is a breaking change.

My solution
I did bypass this by rolling back --> #2866

In requirements/base.txt

• Change this line --> uvicorn==0.12.1 # https://github.com/encode/uvicorn
• To this --> uvicorn==0.11.8 # https://github.com/encode/uvicorn
• Redeploy

Will this have any further implicatons for my project down the line?

[foarsitter]

As mentioned in #2894 by @Andrew-Chen-Wang uvicorn has changed the way the install dependencies: encode/uvicorn@5fa99a1#diff-60f61ab7a8d1910d86d9fda2261620314edcae5894d5aaa236b821c7256badd7

[Andrew-Chen-Wang]

@westerntrix No, just install those missing dependencies. Refer to uvicorn's website for any additional performance booster packages that they mention. Once you get those installed, there shouldn't be any more problems.