[Answered ]-Why the django run command "python3 manage.py runserver" does not execute in docker-compose?

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Maybe python3 manage.py runserver 127.0.0.1:80 already run, just the log did not be flushed.

One option could be add PYTHONUNBUFFERED=1 to docker-compose.yaml to let python not buffer output:

services:
  backend:
    environment:
      - PYTHONUNBUFFERED=1
    build:
      context: .
      dockerfile: backend.Dockerfile

Or add tty: true to docker-compose.yaml to change output to line buffered:

services:
  backend:
    tty: true

Then, check the log to see if any output could help you debug.