Collecting futures==3.2.0 failed in Deploy python flask app into Heroku

Question

I am new to Heroku and I am trying to deploy a python flask app into Heroku, but in doing so, I got the message:

Could not find a version that satisfies the requirement futures==3.2.0 (from -r /tmp/build_b6e63e1db9605f37d761ae7a911fd5b1/requirements.txt (line 7)) (from versions: 0.2.python3, 0.1, 0.2, 1.0, 2.0, 2.1, 2.1.1, 2.1.2, 2.1.3, 2.1.4, 2.1.5, 2.1.6, 2.2.0, 3.0.0, 3.0.1, 3.0.2, 3.0.3, 3.0.4, 3.0.5, 3.1.0, 3.1.1)

I am trying with Python 2.7 and 3.7 version, but I still get the same error. Can any one advise me on this?

Answer 1

The current version of futures is apparently futures 3.3.0 according to PyPI. You can get older copies of futures from the project's GitHub release page.

Hypothetically speaking, you should be able to download the correct .zip file (e.g. pythonfutures-3.20.zip), upload/extract in on your platform and run the setup.py installation file with ex. python setup.py install.

That said, I am unsure that Heroku allows this currently, so you may need to find another way to get futures 3.2.0 installed.