For example, if there are a total of 9 windows in the Revit model, with 4 windows in family A, 2 windows in family B, 2 windows in family C, and 1 window in family D,
what is the way to randomly change the families of the windows in the Revit model based on the specified quantity for each family?
Put that many types in a list, use list.shuffle then set their types as values using element.setparameterbyname and the name ‘Type’ for the parameter.
If you want to manually specify how many of each you want this is a scale limited solution. To scale this you could explore proportions and counting the number of windows to build a smarter list of types to set before shuffling.