code: def read_environment_file(envfile=None):
      
      if envfile is None:
          frame = sys._getframe()
          envfile = os.path.join(os.path.dirname(frame.f_back.f_code.co_filename), '.env')
          if not os.path.exists(envfile):
              warnings.warn("not reading %s - it doesn't exist." % envfile)
              return
      for k, v in parse_environment_file(envfile):
          os.environ.setdefault(k, v)
docs: Read a .env file into os.environ.
  
      If not given a path to a envfile path, does filthy magic stack backtracking
      to find manage.py and then find the envfile.