kivy戦記(16-2)　開始データパスの初期を求める　OS情報を求める

import os
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.popup import Popup
from kivy.uix.treeview import TreeViewLabel
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.properties import ObjectProperty, StringProperty
from pprint import pprint
from kivy.core.text import LabelBase, DEFAULT_FONT
from kivy.resources import resource_add_path
# 日本語フォント設定
resource_add_path('./fonts')
LabelBase.register(DEFAULT_FONT, 'ipaexg.ttf')
sm = ScreenManager()
class MsgboxOk(BoxLayout):
    message_text = StringProperty()
    ok_button = ObjectProperty(None)
class MsgboxOkCancel(BoxLayout):
    message_text = StringProperty()
    ok_button = ObjectProperty(None)
    cancel_button = ObjectProperty(None)
class SetSCN(Screen):
    def __init__(self, **kwargs):
        super(SetSCN, self).__init__(**kwargs)
    def msgTestOk(self):
        pprint ('OKが押されました')
        self.popup.dismiss()
    def msgTestCancel(self):
        pprint ('CANCELが押されました')
        self.popup.dismiss()
    def selfOk(self):
        content = MsgboxOkCancel \
            (ok_button= self.msgTestOk, \
            cancel_button= self.msgTestCancel, \
            message_text= 'とりあえずボタンを作りましたよ')
        self.popup = Popup(title='ボタンだがや', content=content)
        self.popup.open()
        sm.current = 'all'
    def selfCancel(self):
        sm.current = 'all'
class LoadDialog(FloatLayout):
    load = ObjectProperty(None)
    cancel = ObjectProperty(None)
class AllSCN(Screen):
    tv = ObjectProperty(None)
    file_name = ObjectProperty(None)
    loadfile = ObjectProperty(None)
    text_input = ObjectProperty(None)
    def __init__(self, **kwargs):
        super(AllSCN, self).__init__(**kwargs)
        thisos = os.name
        if thisos == 'posix':
            print ('UNIX系統が動いています')
        elif thisos == 'nt':
            print ('Windowsが動いています')
        else:
            print ('サポートしていないOSが動いています')

        self.tv.add_node(TreeViewLabel(text ='シンカリオン E1 とき'))
        self.tv.add_node(TreeViewLabel(text ='シンカリオン 0 ひかり'))
        self.tv.add_node(TreeViewLabel(text ='シンカリオン キハ32　鉄道ホビートレイン'))
    def setupButtonClicked(self):
        sm.current = 'set'
    def show_load(self):
        content = LoadDialog(load = self.load, cancel = self.dismiss_popup)
        self._popup = Popup( title="読み込み中", content=content, size_hint=(0.9,0.9))
        self._popup.open()
    def load (self, path, filename):
        pprint(filename)
        self.file_name.text = filename[0]
        #with open (os.path.join(path, filename[0])) as stream:
        #    self.text_input.text = stream.read()
        self.dismiss_popup()
    def dismiss_popup(self):
        self._popup.dismiss()
class FilelistApp(App):
    def build(self):
        sm.add_widget(AllSCN(name='all'))
        sm.add_widget(SetSCN(name='set'))
        return sm
if __name__ == '__main__':
    FilelistApp().run()