gistfile1.txt

from plone.app.portlets.portlets import calendar


        left = getUtility(
            IPortletManager, name=u'plone.leftcolumn', context=context
        )
        manager = getMultiAdapter((context, left,), IPortletAssignmentMapping)
        chooser = INameChooser(manager)
        assignment = calendar.Assignment()
        manager[chooser.chooseName(None, assignment)] = assignment