Creates a new gobject.param_spec.ParamSpec instance for a property holding a gtk.expression.Expression.
See [gobject.param_spec.ParamSpec.internal] for details on the property strings.
canonical name of the property
a user-readable name for the property
a user-readable description of the property
flags for the property
a newly created property specification
Creates a new gobject.param_spec.ParamSpec instance for a property holding a gtk.expression.Expression.
See [gobject.param_spec.ParamSpec.internal] for details on the property strings.