def set_workflow_policy(obj):
    product = 'CMFPlacefulWorkflow'
    obj.manage_addProduct[product].manage_addWorkflowPolicyConfig()
    pc = getattr(obj, WorkflowPolicyConfig_id)
    pc.setPolicyIn(policy='one-state')

def createFolder(context, title, allowed_types=['Topic'],
                 exclude_from_nav=False):
    oid = idnormalizer.normalize(title, 'es')
    if not hasattr(context, oid):
        context.invokeFactory('Folder', id=oid, title=title)
        folder = context[oid]
        folder.setConstrainTypesMode(constraintypes.ENABLED)
        folder.setLocallyAllowedTypes(allowed_types)
        folder.setImmediatelyAddableTypes(allowed_types)
        set_workflow_policy(folder)
        if exclude_from_nav:
            folder.setExcludeFromNav(True)
        folder.reindexObject()

createFolder(site, u'Participa',
                 allowed_types=['Folder'])