How to revert changes?

[ulyverse]

I would like to revert to an earlier saved state after making changes.

On javascript you can do something like this:

var savedState = app.activeDocument.activeHistoryState;
//do something
app.activeDocument.activeHistoryState = savedState;

but this doesn't work in python

savedState = app.activeDocument.activeHistoryState
#do something
app.activeDocument.activeHistoryState = savedState

it throws this error: AttributeError: can't set attribute 'activeHistoryState'

activeHistoryState appears to be readonly, is there a different way to revert back using this api? thanks!

[loonghao]

I deployed a new version and the issue has been solved