An object that represents a group of fonts with varying sizes.
A PangoFontFace object represents a group of fonts with the same family, weight, slant, stretch and width but varying sizes. A list of font faces can be retrieved from a PangoFontFamily object using the list_faces() method.
describe() Returns a PangoFontDescription object. get_face_name() Returns the name of the font face. list_sizes() Returns a list of available font sizes.