Docker & makefile

Dockerfile

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

Makefile

venv:
	if [ -d .py ] ; \
	then \
		echo "virtualenv already built, skipping..."; \
	else \
		python3 -m venv .py; \
		.py/bin/python3 -m pip install -r requirements.txt; \
	fi

myapp_run: venv
	.py/bin/python3 myapp.py

myapp.py

import numpy as np
from pandas import DataFrame, Series
import pandas as pd

print("Hello World")

requirements.txt

python-dateutil==2.7.5
numpy
pandas==0.23.4
psycopg2==2.7.6.1
urllib3==1.24.1