Make FileChooserDialog allow user to select a folder/directory

Question

Can a gtk.FileChooserDialog/gtk.FileChooserButton be set to only allow users to select a folder/directory?

Maybe I add a directory filter to achieve this? How can I make it so the user can only select a folder?

email_dialog    = gtk.FileChooserDialog(title="Select folder",
                                        buttons=(gtk.STOCK_CANCEL, gtk.RESPONSE_CANCEL, gtk.STOCK_OPEN, gtk.RESPONSE_OK))
email_filter = gtk.FileFilter()
email_filter.set_name("Folder")
email_filter.add_pattern("*")  # whats the pattern for a folder
email_dialog.add_filter(email_filter)

Answer 1

email_dialog.set_action(gtk.FILE_CHOOSER_ACTION_SELECT_FOLDER)

Documentation here.