setupext.py 文件源码

def backend_gtk3cairo_internal_check(x):
    try:
        import cairocffi
    except ImportError:
        try:
            import cairo
        except ImportError:
            return (False, "Requires cairocffi or pycairo to be installed.")

    try:
        import gi
    except ImportError:
        return (False, "Requires pygobject to be installed.")

    try:
        gi.require_version("Gtk", "3.0")
    except ValueError:
        return (False, "Requires gtk3 development files to be installed.")
    except AttributeError:
        return (False, "pygobject version too old.")

    try:
        from gi.repository import Gtk, Gdk, GObject
    except (RuntimeError, ImportError):
        return (False, "Requires pygobject to be installed.")

    return (True, "version %s.%s.%s" % (
        Gtk.get_major_version(),
        Gtk.get_micro_version(),
        Gtk.get_minor_version()))