Here is my Menu class project (BaseMenu, MenuController and 2 subclasses: Menu, MenuLevel.) It's designed to live in site-packages and be added to the Actions menu.

You need to make directories of 'documents', 'snippets', 'tools' and 'projects' for it to work (note all lower case.)

The default action is Run, click the button to switch the action to Edit (except for Snippets, where the default is reversed.)

The code to do the action is in 2 flavours, execfile() if you prefer that, or silent notification (which I use) ... but it's currently commented out awaiting v.next of Pythonista owing to the threading issues.

image (c) @tony .... (for more classes in this family see... Classes )

image (c) @tony

Menu.py

import ui, console, editor, os, notification

class BaseMenu (ui.View):
    def __init__(self, directory):
        console.hide_output()
        self.__make_self(directory)
        self.__make_lds()
        self.__make_tv()
        self.__make_biB()
        self.__make_biE()
        self.layout()
        self.did_load() 
        self.present('popover')

    def did_load(self):
        if self.sDir == 'snippets': self.__biAE(object)

    def layout(self):
        self.width = 320
        self.height = len(self.lItems) * 50
        self.__tv.frame = (0, 0, 320, 600)
        self.__tv.row_height=50

    def __make_self(self, directory):
        self.BaseMenu_version = '3.0'
        self.BaseMenu_source_code = 'Original by @tony.'
        self.BaseMenu_permissions = 'Permission to use/subclass/redistribute, but NOT to modify code.'
        self.sDir = directory
        self.name = self.sDir.title()
        self.sRow = ''
        self.lItems = list()
        self.bEdit = False
        self.make_list()

    def make_list(self):
        pass

    def __make_lds(self):
        self.__lds = ui.ListDataSource(self.lItems)
        self.__lds.action = self.__ldsA

    def __make_tv(self):
        self.__tv = ui.TableView()
        self.__tv.data_source = self.__lds
        self.__tv.delegate = self.__lds
        self.add_subview(self.__tv)

    def __make_biB(self):
        self.__biB = ui.ButtonItem()
        self.__biB.image = ui.Image.named('ionicons-ios7-arrow-back-32')
        self.__biB.action = self.__biAB
        self.left_button_items = [self.__biB]   

    def __make_biE(self):
        self.__biE = ui.ButtonItem()
        self.__biE.image = ui.Image.named('ionicons-ios7-play-outline-32')
        self.__biE.action = self.__biAE
        self.right_button_items = [self.__biE]  

    def __ldsA(self, sender):
        self.sRow = sender.items[sender.selected_row]['title']
        self.close()

    def __biAB(self, sender):
        self.sRow = '*back'
        self.close()

    def __biAE(self, sender):
        self.bEdit = not self.bEdit
        if self.bEdit:
            self.__biE.image = ui.Image.named('ionicons-ios7-compose-outline-32')
        else:
            self.__biE.image = ui.Image.named('ionicons-ios7-play-outline-32')

class Menu (BaseMenu):
    def did_load(self):
        self.left_button_items = []
        self.right_button_items = []

    def make_list(self):
        self.lItems = ({'title': 'Documents', 'image': 'ionicons-ios7-cloud-outline-32','accessory_type': 'disclosure_indicator'}), ({'title': 'Snippets',  'image': 'ionicons-ios7-pricetag-outline-32','accessory_type': 'disclosure_indicator'}), ({'title': 'Tools', 'image': 'ionicons-ios7-search-32', 'accessory_type': 'disclosure_indicator'}), ({'title': 'Projects', 'image': 'ionicons-ios7-star-outline-32', 'accessory_type': 'disclosure_indicator'})

class MenuLevel (BaseMenu):
    def make_list(self):
        self.lItems = list()
        for entry in os.listdir(os.path.expanduser('~/Documents/' + self.sDir + '/')):
            if os.path.splitext(entry)[1] == '.py':
                self.lItems.append({'title': os.path.splitext(entry)[0]})

class MenuController (object):
    def __init__(self):
        self.__make_self()
        self.__control_menu()

    def __make_self(self):
        self.MenuController_version = '3.0'
        self.MenuController_source_code = 'Original by @tony.'
        self.MenuController_permissions = 'Permission to use/subclass/redistribute, but NOT to modify code.'

    def __control_menu(self):
        self.__m = Menu('Menu')
        self.__m.wait_modal()
        if self.__m.sRow != '':
            self.__ml = MenuLevel(self.__m.sRow.lower())
            self.__ml.wait_modal()
            if self.__ml.sRow == '*back':
                MenuController()
            else:
                pass
#               if False:
#                   if self.__ml.sRow != '':
#                       if self.__ml.bEdit:
#                           editor.open_file(self.__ml.sDir + '/' + self.__ml.sRow + '.py')
#                       else:
#                           execfile(os.path.expanduser('~/Documents/' + self.__ml.sDir + '/' + self.__ml.sRow + '.py'))
#               else:
#                   if self.__ml.sRow != '':
#                       if self.__ml.bEdit:
#                           target = self.__ml.sDir + '/' + self.__ml.sRow
#                       else:
#                           target = self.__ml.sDir + '/' + self.__ml.sRow + '?action=run'
#                       notification.schedule('', 0.1, '', 'pythonista://' + target)

if __name__ == "__main__":
    MenuController()

Version 3.0: simplified action line