我试图使用python文件到.kv
文件的变量
所以我搜索了类似的问题,找到了使用Property
的方法,并编写了如下代码:
# in python file
class Test2App(App):
abcd = StringProperty('test')
def build(self):
return presentation
# in kv file
<MyButton@Button>:
text: "contents (%s)"%(app.abcd)
background_color: (255, 255, 255,1)`
一个错误出现了。在
^{pr2}$t2.py型
#-*- coding: utf-8 -*-
__version__ = "1.0"
import kivy
import os
kivy.require('1.10.0')
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.button import Button
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.gridlayout import GridLayout
from kivy.uix.image import Image
from kivy.uix.label import Label
from kivy.animation import Animation
from kivy.clock import Clock
from kivy.properties import StringProperty
#from kivy.config import Config #windows size fixed
#Config.set('graphics', 'resizable', 0)
from kivy.core.window import Window
Window.size = (540, 960)
#Window.size = (1080, 1920)
##########FOR BUS INFORMATION UPDATE#############
from urllib import urlencode, quote_plus
from urllib2 import Request as RQ
from urllib2 import urlopen as UO
import urllib
import xml.etree.ElementTree as etree
import os
import datetime
def oopath(ndid, uor):
path = os.path.join(ndid + '.txt')
return path
##############################################################################################################
class StationTest(Screen):
def __init__(self, **kwargs):
super(StationTest, self).__init__(**kwargs)
oo = oopath('TESTTEST', 0)
self.rpandgv(oo)
def rpandgv(self,path):
with open(path) as businfo:
Businfo= []
nolinenum=businfo.readline()
while nolinenum!='':
Businfo.append(nolinenum)
leftstations = (businfo.readline().rstrip('\n') + ' stations'.rstrip('\n'))
lefttime = (businfo.readline().rstrip('\n') + ' seconds'.rstrip('\n'))
nolinenum = businfo.readline().rstrip('\n')
Businfo.append(leftstations)
Businfo.append(lefttime)
self.businfolist = Businfo
self.lenbil = int(len(Businfo))
self.numberoflist = int(len(Businfo)/3)
class ScreenManagement(ScreenManager):
pass
presentation = Builder.load_file("t2.kv")
class Test2App(App):
abcd = StringProperty('test')
def build(self):
return presentation
Test2App().run()
t2.kv
# -*- coding: utf-8 -*-
#:import NoTransition kivy.uix.screenmanager.NoTransition
#:import SlideTransition kivy.uix.screenmanager.SlideTransition
#:import Label kivy.uix.button.Label
ScreenManagement:
transition: SlideTransition(direction='left')
StationTest:
<StationTest>:
name: 'StationTest'
canvas:
Rectangle:
pos: self.pos
size: self.size
source: 'image/background.png' #backgroundimage
header: _header
ScrollView:
FloatLayout:
size_hint_y: None
height: 500
BoxLayout:
id: _header
orientation: 'vertical'
size_hint: 1, 0.10
pos_hint: {'top': 1.0}
anchor: _anchor
canvas:
Color:
rgba: 0.8, 0.6, 0.4, 1.0
Rectangle:
pos: self.pos
size: self.size
Label:
text: "STATION > STATION"
font_size: 40
BoxLayout
id: _anchor
size_hint_y: 0.3
canvas.before:
Color:
rgba: 0.3, 0.5, 0.8, 1.0
Rectangle:
pos: self.pos
size: self.size
Label:
text: "TEST1234"
BoxLayout:
orientation: 'vertical'
size_hint: 1, 0.35
padding: 0, -200, 0, 0
MyButton:
MyButton:
MyButton:
MyButton:
<MyButton@Button>:
text: "contents (%s)"%(app.abcd)
background_color: (255, 255, 255,1)
这个问题有两种解决办法。请参考解决方案和示例了解详细信息。在
解决方案1:kv文件-使用If语句
解析kv文件时,
abcd
是None
。添加if...else...
语句来解决问题。在代码段-kv文件
解决方案2:Python代码-在build()方法中初始化
初始化变量,
build()
方法中的abcd
。在代码片段-Python代码
^{pr2}$示例
在主.py在
在试验电压在
输出
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