Deploy Python app to Heroku with extra pip install

Question

I'm trying to implement Deploy to Heroku functionality for my Python application: https://github.com/jet-admin/jet-bridge/tree/heroku It woks OK if just use requirements.txt to install dependencies, but it require me to modify my requirements.txt to include some extra packages that i normally don't need (psycopg2, mysqlclient). Is it possible not to include all requirements in requirements.txt, but install it with some extra command? I've tried adding postdeploy script which will perform pip install command, but after deploy succed my application says that psycopg2 is not installed (thought i installed it in postdeploy command). JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

Answer 1

The Heroku Python buildpack has a hook where you can execute extra commands after the initial slug compilation. To use it, you can add a bin/post_compile file, putting inside the shell commands for installing the extra packages. You can even make it depend on an environment variable, like: # assuming you have files mysql-requirements.txt and postgres-requirements.txt if [ "$JET_BRIDGE_DB" == "mysql" ]; then echo "Installing Python dependencies for MySQL support" pip install -r mysql-requirements.txt else echo "Assuming Postgres database, installing Python dependencies" pip install -r postgres-requirements.txt fi Read more: Buildpacks: https://devcenter.heroku.com/articles/buildpacks Heroku Python Buildpack: https://github.com/heroku/heroku-buildpack-python Slug compilation: https://devcenter.heroku.com/articles/slug-compiler