subprocess.call example for Static Python Container

Dockerfile copies python parts, including the entrypoint.py file to the image. Build this:

docker build -t sample-python-app-subprocess .

Run:

# Prebuilt version

docker run thedoh/sample-python-app-subprocess:latest

# Build it yourself version

docker run sample-python-app-subprocess

Program Flow

Docker starts this image
CMD calls /python -s -S /entrypoint.py
entrypoint.py uses subprocess.call to call /python -s -S /myapp.py` as a sub-process (ie, child process of pid 1)
Execution begins from within myapp.py, being executed by /python (the static binary)
When myapp.py finishes running then execution is returned to entrypoint.py just after the subprocess.call line.