How do I deploy on Heroku a Python wrapper?

Question

I am trying to deploy a program on heroku. The program uses Flask and Python. It does not make any calls to a database.

It runs locally without an issue.

It builds successfully on heroku.

But when I interact with the web page, an AJAX call fails because it lacks a dependency. Error message:

POST https://hal-stage.herokuapp.com/reason 500 (Internal Server Error)

Inspecting the logs shows:

2020-02-29T23:45:05.133568+00:00 app[web.1]: raise InstallError('The SDD library is not available. Please install the PySDD package.')
2020-02-29T23:45:05.133574+00:00 app[web.1]: problog.errors.InstallError: The SDD library is not available. Please install the PySDD package..

The PySDD library is part of requirements.txt.

How do I push to heroku the underlying SDD library?

Kenny Aires · Accepted Answer · 2020-03-01 02:02:55Z

2

You must add all dependencies on your pipfile, for example:

[[source]]

url = "https://pypi.python.org/simple"
verify_ssl = true


[packages]

Flask = "*"
PySDD = "*"

[requires]

python_version = "3.6"

Hope it suits well

answered Mar 1, 2020 at 2:02

Kenny Aires

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3 Comments

mac389 Over a year ago

Thanks, this helps somewhat. What if I want to deploy with a Python package on my computer that I compiled from source? How do I upload that folder (i.e. from site-packages)?

Chris Over a year ago

OP says they are using a requirements.txt file, which means pip, not Pipenv. If so, they should continue to use that file instead of adding a Pipfile. (If Heroku finds a Pipfile and Pipfile.lock it will completely ignore the requirements.txt, which could easily lead to other missing dependencies.)

Kenny Aires Over a year ago

@mac389 this answer might give you some light about compiled packages on heroku.

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