Load environment variables from bash into current python process

load_env_from_bash_script.py

import os
import subprocess
script = '/home/harry/.virtualenvs/my-project-name/bin/postactivate'  # eg
env_to_json = 'import os, json; print(json.dumps(dict(os.environ)))'
environ_json = subprocess.check_output(
    '. {} && python -c "{}"'.format(script, env_to_json),
    shell=True, env={}
)
os.environ.update(json.loads(environ_json.decode('utf8')))