Intento instalar pygobject por pip

pip install --user PyGObject

pero no trabajo

Collecting PyGObject
  Using cached pygobject-2.28.3.tar.bz2
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 20, in <module>
      File "C:\Users\A\AppData\Local\Temp\pip-build-phby_jwb\PyGObject\
setup.py", line 272
        raise SystemExit, 'ERROR: Nothing to do, gio could not be found and is
 essential.'
                        ^
    SyntaxError: invalid syntax

    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in C:\Users\A\AppData\Local\Temp\pip-build-phby_jwb\PyGObject

Mi versión de Python v3.5.0: 374f501f4567, ahora trabajo en Windows 7