Building a Python package, and a container image with poetry

# init the new project in the current directory
% poetry init --python "^3.7" --dependency "Flask:*"
# create the virtual environment (and the poetry.lock file)
% poetry install
# hello_world/
from flask import Flask
app = Flask(__name__)

def hello():
return "Hello World!"

if __name__ == "__main__":
% export FLASK_APP=hello_world
% export FLASK_ENV=development
% poetry run flask run

Packaging the application

% poetry build --format wheel
% poetry add "Flask:>=1.1,<1.2"

To pin or not to pin

# install versions from poetry.lock
% poetry install
# update versions in the poetry.lock
% poetry update --lock
% poetry export | tee requirements.txt

Building the container image

FROM ubuntu:focal

SHELL ["/bin/bash", "-xe", "-c"]

ARG DEBIAN_FRONTEND=noninteractive

COPY . /app

RUN apt-get update -q \
&& apt-get install -y -q --no-install-recommends \
python3-wheel \
python3-pip \
gunicorn \
&& if [ -e requirements.txt ]; then \
python3 -m pip install --no-cache-dir \
--disable-pip-version-check \
-r requirements.txt; \
fi \
&& python3 -m pip install \
--no-cache-dir --disable-pip-version-check \
/app/ \
&& apt-get remove -y python3-pip python3-wheel \
&& apt-get autoremove -y \
&& apt-get clean -y \
&& rm -rf /var/lib/apt/lists/* \
&& useradd _gunicorn --no-create-home --user-group

USER _gunicorn

CMD ["gunicorn", \
"--bind", "", \

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Yoan Blanc

Yoan Blanc

Senior developer

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