Python version support

version.py

import os
from pathlib import Path

current_dir = os.path.dirname(__file__)
version_file_full_path = os.path.join(current_dir, "VERSION.txt")

"""
Create and obtain version information based on environment variables:

* APP_MAJOR_VERSION
* APP_BUILD_VERSION
"""

def get_version():
    if Path(version_file_full_path).is_file():
        with open(version_file_full_path) as version_file:
            return version_file.read()
    else:
        return "UNKNOWN VERSION"


def create_version():
    version = "{0}.{1}".format(
        os.environ.get('APP_MAJOR_VERSION', 0),
        os.environ.get('APP_BUILD_VERSION', '0')
    )
    _create_version_file(version)
    return version


def _create_version_file(version):
    with open(version_file_full_path, 'w') as version_file:
        version_file.write(version)


__version__ = get_version()