add a test echo_and_quit examples

python/src/deltachat/account.py

@@ -58,6 +58,7 @@ class Account(object):
             db_path = db_path.encode("utf8")
         if not lib.dc_open(self._dc_context, db_path, ffi.NULL):
             raise ValueError("Could not dc_open: {}".format(db_path))
+        self.db_path = db_path
         self._configkeys = self.get_config("sys.config_keys").split()
         atexit.register(self.shutdown)