When using gdbgui in ubuntu16, python3.5, syntax error happened

When im using gdbgui in ubuntu16 with python3.5, the gdbgui version is 0.13.2.0, error happened

> Traceback (most recent call last):
> File "/root/.virtualenvs/venvgdbgui/bin/gdbgui", line 5, in
> from gdbgui.backend import main
> File "/root/.virtualenvs/venvgdbgui/lib/python3.5/site-packages/gdbgui/backend.py", line 38, in
> from gdbgui.statemanager import StateManager # noqa
> File "/root/.virtualenvs/venvgdbgui/lib/python3.5/site-packages/gdbgui/statemanager.py", line 3, in
> from pygdbmi.gdbcontroller import GdbController
> File "/root/.virtualenvs/venvgdbgui/lib/python3.5/site-packages/pygdbmi/gdbcontroller.py", line 82
> logger.debug(f'Launching gdb: {" ".join(self.command)}')
> ^
> SyntaxError: invalid syntax