How did you create Docker images from scratch in your projects?

To create a Docker image from scratch in Python projects, I usually write a Dockerfile that starts with a base image, such as python:3.9-slim. Then I copy the application's source code into the container, install dependencies using pip, and set the command to run.

A simple example of a Dockerfile:

FROM python:3.9-slim

WORKDIR /app

COPY requirements.txt ./
RUN pip install --no-cache-dir -r requirements.txt

COPY . ./

CMD ["python", "app.py"]

This approach allows creating a lightweight image with minimal dependencies, ready to run the application. It is important to optimize layers during the process to speed up the build and reduce the image size.