Python project structure

gistfile1.txt

project/ # project root
  conf/  # config files, could also be put in project/project/
  lib/   # some libraries, probably you don't need it if you use a package manager like pip.
  project/  
    __init__.py
    project.py
    core.py
    submodule/
      __init__.py
      submodule.py
  tests/
    __init__.py
    test_project.py
    test_core.py
    submodule/
      __init__.py
      test_submodule.py
  setup.py              
  README.md
  requirements.txt
  project.py