CODEWITHSUNDEEP
pythonamazon-web-servicesflaskheroku
Rahul Kumar
Rahul Kumar

Reputation: 11

Uploading python flask app to Heroku raises error

While uploading my python flask app to Heroku I got the following error:

ERROR: Could not find a version that satisfies the requirement dataclasses==0.8 (from -r /tmp/build_d980c139/requirements.txt (line 4)) (from versions: 0.1, 0.2, 0.3, 0.4, 0.5, 0.6)
remote:        ERROR: No matching distribution found for dataclasses==0.8 (from -r /tmp/build_d980c139/requirements.txt (line 4))
remote:  !     Push rejected, failed to compile Python app.

Upvotes: 1

Views: 1560

Answers (1)

Afridi Rahman
Afridi Rahman

Reputation: 73

Heroku installs the latest python version for your app. Currently I'm assuming it is installing python version 3.9.6. But from python 3.8.0 and onwards the dataclasses==0.8 is pre-built there. this external dataclasses library only exists from 0.1 - 0.6 version (which is showing in the error message) and has probably stopped upgrading as it exists in the pre-built now. Since it is not finding that particular 0.8 version, so it is throwing that not found error.

Now to solve the problem, There can be two ways- The easy way is to remove dataclasses==0.8 from the requirement.txt and upload it.

Another way is to keep the dataclasses==0.8 in the requirement.txt and add another txt file called 'runtime.txt' in the same root directory where your requirement.txt is. And this line -Python {yourspecifiedversion}. this will tell Heroku which python version to install. You can select a python version that will match properly with all of your external libraries. but you will need to add 'dataclasses==0.8' if the python version is less 3.8.0

Specifying a python runtime on Heroku is in this link - Specifying a Python Runtime

Upvotes: 6

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