alove

import psycopg2

class query():
	def __init__(self):
		"""Set credential information here, or pass the information as 
		arguments to the class, or read your credentials from environment 
		variables. Anyway you choose to handle crendtials, pass them to these
		class variables."""
		
		self.DB_USER = '<username>'

alove

FROM python:3.7.3-alpine3.9
RUN apk add build-base
RUN apk update && apk add postgresql-dev gcc python3-dev musl-dev
COPY requirements.txt /myapp/requirements.txt
COPY Makefile /myapp/Makefile
RUN python3 -m pip install virtualenv
RUN cd myapp && make venv