Serverless Framework - Python and Requirements.txt

Question

Using the serverless framework v1.0.0, I have a \'requirements.txt\' in my service root with the contents being the list of dependant python packages. (e.g. requests).

Answer 1

Now you can use serverless-python-requirements. It works both for pure Python and libraries needing native compilation (using Docker):

A Serverless v1.x plugin to automatically bundle dependencies from requirements.txt and make them available in your PYTHONPATH.

Requires Serverless >= v1.12

Answer 2

The Serverless Framework doesn't handle the pip install. See https://stackoverflow.com/a/39791686/1111215 for the solution

Answer 3

You need to install serverless-python-requirements and docker

$ npm install serverless-python-requirements

Then add the following to your serverless.yml

plugins:
   - serverless-python-requirements

custom:
  pythonRequirements:
     dockerizePip: non-linux

Make sure you have your python virtual environment active in CLI:

$ source venv/bin/activate

Install any dependencies with pip - note that in CLI you can tell if venv is active by the venv to the left of the terminal text

(venv) $ pip install <NAME>
(venv) $ pip freeze > requirements.txt

Make sure you have opened docker then deploy serverless as normal

$ serverless deploy

What will happen is that serverless-python-requirements will build you python packages in docker using a lambda environment, and then zip them up ready to be uploaded with the rest of your code.

Full guide here