def __init__(self, database):
        """**DEPRECATED**: Get a system js helper for the database `database`.

        SystemJS will be removed in PyMongo 4.0.
        """
        warnings.warn("SystemJS is deprecated",
                      DeprecationWarning, stacklevel=2)

        if not database.write_concern.acknowledged:
            database = database.client.get_database(
                database.name, write_concern=DEFAULT_WRITE_CONCERN)
        # can't just assign it since we've overridden __setattr__
        object.__setattr__(self, "_db", database)
**DEPRECATED**: Get a system js helper for the database `database`.

        SystemJS will be removed in PyMongo 4.0.
        
stackoverflow/venv/lib/python3.6/site-packages/pymongo/database.py