run error:{AttributeError: 'module' object has no attribute 'require_version}

env: win10 64bit , run error:
D:\jwf\workspace_py\Postgres-GUI>python app.py
   Traceback (most recent call last):
   File "app.py", line 12, in 
   gi.require_version('Gtk', '3.0')
  AttributeError: 'module' object has no attribute 'require_version'