Cfrgtkky

currently i am storing all the text input by the user in a file.
when i run this code the screenfive buttons text root.a and root.b are the previous entries but not the present textinput entered.

meaning that in the first execution i had input firstname1 and lastname1 on the screen four.in the screen five's button i see with ( with )
because this is the first time the files are created so there is no text in them.

in the second execution i type fistname2 and lastname2 in screen four but when i move to screen five it displays 'firstname1 with firstname1' in the button's text but i am expecting 'firstname2 with lastname2' which was what i entered during the present execution
this is the python code:

 from kivy.app import App

from kivy.lang import Builder

from kivy.uix.screenmanager import ScreenManager, Screen, FadeTransition



from kivy.core.window import Window

from kivy.uix.textinput import TextInput

from kivy.uix.floatlayout import FloatLayout

from kivy.uix.scatter import Scatter

from kivy.uix.button import Button

from kivy.uix.label import Label

from kivy.config import Config

from kivy.base import runTouchApp



from kivy.uix.widget import Widget

from kivy.properties import ObjectProperty, NumericProperty, StringProperty





root = FloatLayout()



class ScreenManagement(ScreenManager):

    pass



class A(Screen):

    pass



class B(Screen):

    pass



class C(Screen):

    pass



class ScreenFour(Screen):

    group_text_input = ObjectProperty()

    disability_text_input = ObjectProperty()



    grouptextinput = StringProperty('')

    disabilitytextinput = StringProperty('')



    global grouptextinput, disabilitytextinput



    def submit_textinput(self):

        self.grouptextinput = self.group_text_input.text

        print("group of people: {}".format(self.grouptextinput))

        self.save()



        self.disabilitytextinput = self.disability_text_input.text

        print("with following disability: {}".format(self.disabilitytextinput))

        self.save2()



    def save(self):

        with open("grouptextinput.txt", "w") as fobj:

            fobj.write(str(self.grouptextinput))

    def save2(self):

        with open("disabilitytextinput.txt", "w") as fobj:

            fobj.write(str(self.disabilitytextinput))            

    pass



class Help(Screen):

    pass



class ScreenFive(Screen):

    box = ScreenFour()

    a = StringProperty()

    b = StringProperty()





    myfile = open('grouptextinput.txt','r')

    print 'file is opened'

    a = myfile.readline(14)

    print a



    myfile = open('disabilitytextinput.txt','r')

    print 'file is opened'

    b = myfile.readline(14)

    print b



##    a = box.grouptextinput

##    b = box.grouptextinput



    pass



class ScreenSix(Screen):

    pass



class One(Screen):

    a = StringProperty()

    b = StringProperty()





    myfile = open('grouptextinput.txt','r')

    a = myfile.readline(14)



    myfile = open('disabilitytextinput.txt','r')

    b = myfile.readline(14)



    pass



class Two(Screen):

    a = StringProperty()

    b = StringProperty()





    myfile = open('grouptextinput.txt','r')

    a = myfile.readline(14)



    myfile = open('disabilitytextinput.txt','r')

    b = myfile.readline(14)



    pass



class Three(Screen):

    a = StringProperty()

    b = StringProperty()





    myfile = open('grouptextinput.txt','r')

    a = myfile.readline(14)



    myfile = open('disabilitytextinput.txt','r')

    b = myfile.readline(14)



    pass



class Four(Screen):

    a = StringProperty()

    b = StringProperty()





    myfile = open('grouptextinput.txt','r')

    a = myfile.readline(14)



    myfile = open('disabilitytextinput.txt','r')

    b = myfile.readline(14)



    pass



class Five(Screen):

    a = StringProperty()

    b = StringProperty()





    myfile = open('grouptextinput.txt','r')

    a = myfile.readline(14)



    myfile = open('disabilitytextinput.txt','r')

    b = myfile.readline(14)



    pass



class Six(Screen):

    a = StringProperty()

    b = StringProperty()





    myfile = open('grouptextinput.txt','r')

    a = myfile.readline(14)



    myfile = open('disabilitytextinput.txt','r')

    b = myfile.readline(14)



    pass



class Seven(Screen):

    a = StringProperty()

    b = StringProperty()





    myfile = open('grouptextinput.txt','r')

    a = myfile.readline(14)



    myfile = open('disabilitytextinput.txt','r')

    b = myfile.readline(14)



    pass



class Eight(Screen):

    a = StringProperty()

    b = StringProperty()





    myfile = open('grouptextinput.txt','r')

    a = myfile.readline(14)



    myfile = open('disabilitytextinput.txt','r')

    b = myfile.readline(14)



    pass



class Nine(Screen):

    a = StringProperty()

    b = StringProperty()





    myfile = open('grouptextinput.txt','r')

    a = myfile.readline(14)



    myfile = open('disabilitytextinput.txt','r')

    b = myfile.readline(14)



    pass



presentation = Builder.load_file("main.kv")



class MainApp(App):







    def build(self):

        return presentation



if __name__ == "__main__":

    MainApp().run()

and this is the kivy code:

#: import FadeTransition kivy.uix.screenmanager.FadeTransition



ScreenManagement:

    transition: FadeTransition()

    A:

    B:

    C:

    ScreenFour:

    Help:

    ScreenFive:

    ScreenSix:

    One:

    Two:

    Three:

    Four:

    Five:

    Six:

    Seven:

    Eight:

    Nine:



<A>:

    name: "llll"

    Button:

        on_release: app.root.current = "iiii"

        Image:

            source: '************'

            center_x: self.parent.center_x

            center_y: self.parent.center_y



<Intentions>:

    name: "iiii"

    Image:

        source: '***********'

        y: self.parent.y 

        x: self.parent.x

        allow_stretch: True

        size: 800, 750

    Button:

        text: 'Next'

        id: button

        font_size: 40

        size_hint: None, None

        on_release: app.root.current = "pppp"

        pos: 590,50

        size: 200, 60



<Picot>:

    name: "pppp"

    Image:

        source: '****************'

        y: self.parent.y 

        x: self.parent.x

        allow_stretch: True

        size: 800, 750

    Button:

        text: 'Next'

        id: button

        font_size: 40

        size_hint: None, None

        on_release: app.root.current = "screenfour"

        pos: 590,50

        size: 200, 60   



<ScreenFour>

    name: "screenfour"

    group_text_input: group

    disability_text_input: disability

    canvas.before:

        Rectangle:

            pos: self.pos

            size: self.size

            source: '***************'



    Label:

        text: "**********"

        font_size: '47sp'

        pos: 0, 100

        color: 0,0,0,1

        bold: True



    TextInput:

        id: group

        multiline: False

        size_hint_x: .3

        size_hint_y: .1

        hint_text: '************'

        pos: 90, 220

        font_size: '29sp'



    Label:

        text:"********"

        font_size: '40sp'

        pos: 0, -50

        color: 0,0,0,1

        bold: True



    TextInput:

        id: disability

        multiline: True

        size_hint_x: .3

        size_hint_y: .1

        hint_text: '*********'

        pos: 465, 220

        font_size: '29sp'



    Button:

        text: 'Next'

        id: button

        font_size: 40

        size_hint: None, None

        on_release: app.root.current = "screenfive"

        on_release: root.submit_textinput()

        pos: 590,50

        size: 200, 60



    Button:

        text: 'Help!'

        id: button

        font_size: 30

        size_hint: None, None

        on_release: app.root.current = "help"

        pos: 50,50

        size: 100, 60



<Help>

    name: "help"

    Image:

        source: '******************'

        y: self.parent.y 

        x: self.parent.x

        allow_stretch: True

        size: 800, 750

    Button:

        text: '*********'

        id: button

        font_size: 40

        size_hint: None, None

        on_release: app.root.current = "screenfour"

        pos: 590,50

        size: 200, 60



<ScreenFive>

    name:"screenfive"

    canvas.before:

        Rectangle:

            pos: self.pos

            size: self.size

            source: '***************'



    Label:

        text: '********'

        font_size: '60sp'

        pos: 0, 150

        color: 0,0,0,1

        bold: True



    Label:

        text: '**********'

        font_size: '53sp'

        pos: 0, 75

        color: 0,0,0,1

        bold: True



    Label:

        text: '*******'

        font_size: '60sp'

        pos: 0, 0

        color: 0,0,0,1

        bold: True



    Button:

        text: root.a + ' WITH ' + root.b

        font_size: 40

        text_size: self.width, None

        size: 760, 100

        size_hint: None, None

        pos: 20,150

        halign: 'center'

        background_color: (0, 0, 0, 1)

        color: 1, 1, 1, 1



    Button:

        text: 'Continue'

        id: button

        font_size: 40

        size: 200, 60

        size_hint: None, None

        on_release: app.root.current = "menu"

        pos: 590,50 



<ScreenSix>

    name: "menu"

    canvas:

        Color:

            rgb: .5, .5, .5

        Rectangle:

            size: self.size



    GridLayout:

        cols: 3

        spacing: 20

        padding: [20,50]

        Label:

            text: ''

        Label:

            text: '************'

            font_size: '19sp'

        Label:

            text: ''

        Button:

            text: '********'

            #on_press: root.manager.current = 'settings'

            on_release: app.root.current = "one"

        Button:

            text: '*******'

            on_release: app.root.current = "two"

        Button:

            text: '*****'

            on_release: app.root.current = "three"

        Button:

            text: '********'

            on_release: app.root.current = "four"

        Button:

            text: '********'

            on_release: app.root.current = "five"

        Button:

            text: '********'

            on_release: app.root.current = "six"

        Button:

            text: '*******'

            on_release: app.root.current = "seven"

        Button:

            text: '*********'

            on_release: app.root.current = "eight"

        Button:

            text: '***********'

            on_release: app.root.current = "nine"



<One>

    name: "one"

    Image:

        source: '********'

        y: self.parent.y

        x: self.parent.x

        allow_stretch: True



    Button:

        text: 'Back To Menu'

        id: button

        font_size: 40

        size: 300, 60

        size_hint: None, None

        on_release: app.root.current = "menu"

        pos: 100,13

        allow_stretch: True



    Button:

        text: root.a + ' WITH ' + root.b

        font_size: 40

        text_size: self.width, None

        size_hint: None, None

        halign: 'center'

        background_color: (0, 0, 0, 1)

        color: 1, 1, 1, 1

        pos: 0,520

        size: 800, 80



<Two>

    name: "two"

    Image:

        source: '*******'

        y: self.parent.y

        x: self.parent.x

        allow_stretch: True

        size: 800, 750

    Button:

        text: 'Back To Menu'

        id: button

        font_size: 40

        size: 300, 60

        size_hint: None, None

        on_release: app.root.current = "menu"

        pos: 100,13

    Button:

        text: root.a + ' WITH ' + root.b

        font_size: 40

        text_size: self.width, None

        size_hint: None, None

        halign: 'center'

        background_color: (0, 0, 0, 1)

        color: 1, 1, 1, 1

        pos: 0,520

        size: 800, 80



<Three>

    name: "three"

    Image:

        source: '***********'

        y: self.parent.y

        x: self.parent.x

        allow_stretch: True

        size: 800, 750

    Button:

        text: 'Back To Menu'

        id: button

        font_size: 40

        size: 300, 60

        size_hint: None, None

        on_release: app.root.current = "menu"

        pos: 100,13

    Button:

        text: root.a + ' WITH ' + root.b

        font_size: 40

        text_size: self.width, None

        size_hint: None, None

        halign: 'center'

        background_color: (0, 0, 0, 1)

        color: 1, 1, 1, 1

        pos: 0,520

        size: 800, 80



<Four>

    name: "four"

    Image:

        source: '*************'

        y: self.parent.y

        x: self.parent.x

        allow_stretch: True

        size: 800, 750

    Button:

        text: 'Back To Menu'

        id: button

        font_size: 40

        size: 300, 60

        size_hint: None, None

        on_release: app.root.current = "menu"

        pos: 100,13

    Button:

        text: root.a + ' WITH ' + root.b

        font_size: 40

        text_size: self.width, None

        size_hint: None, None

        halign: 'center'

        background_color: (0, 0, 0, 1)

        color: 1, 1, 1, 1

        pos: 0,520

        size: 800, 80



<Five>

    name: "five"

    Image:

        source: '********************'

        y: self.parent.y

        x: self.parent.x

        allow_stretch: True

        size: 800, 750

    Button:

        text: 'Back To Menu'

        id: button

        font_size: 40

        size: 300, 60

        size_hint: None, None

        on_release: app.root.current = "menu"

        pos: 100,13

    Button:

        text: root.a + ' WITH ' + root.b

        font_size: 40

        text_size: self.width, None

        size_hint: None, None

        halign: 'center'

        background_color: (0, 0, 0, 1)

        color: 1, 1, 1, 1

        pos: 0,520

        size: 800, 80



<Six>

    name: "six"

    Image:

        source: '************'

        y: self.parent.y

        x: self.parent.x

        allow_stretch: True

        size: 800, 750

    Button:

        text: 'Back To Menu'

        id: button

        font_size: 40

        size: 300, 60

        size_hint: None, None

        on_release: app.root.current = "menu"

        pos: 100,13

    Button:

        text: root.a + ' WITH ' + root.b

        font_size: 40

        text_size: self.width, None

        size_hint: None, None

        halign: 'center'

        background_color: (0, 0, 0, 1)

        color: 1, 1, 1, 1

        pos: 0,520

        size: 800, 80



<Seven>

    name: "seven"

    Image:

        source: '*******************'

        y: self.parent.y

        x: self.parent.x

        allow_stretch: True

        size: 800, 750

    Button:

        text: 'Back To Menu'

        id: button

        font_size: 40

        size: 300, 60

        size_hint: None, None

        on_release: app.root.current = "menu"

        pos: 100,13

    Button:

        text: root.a + ' WITH ' + root.b

        font_size: 40

        text_size: self.width, None

        size_hint: None, None

        halign: 'center'

        background_color: (0, 0, 0, 1)

        color: 1, 1, 1, 1

        pos: 0,520

        size: 800, 80



<Eight>

    name: "eight"

    Image:

        source: '********************'

        y: self.parent.y

        x: self.parent.x

        allow_stretch: True

        size: 800, 750      

    Button:

        text: 'Back To Menu'

        id: button

        font_size: 40

        size: 300, 60

        size_hint: None, None

        on_release: app.root.current = "menu"

        pos: 100,13

    Button:

        text: root.a + ' WITH ' + root.b

        font_size: 40

        text_size: self.width, None

        size_hint: None, None

        halign: 'center'

        background_color: (0, 0, 0, 1)

        color: 1, 1, 1, 1

        pos: 0,520

        size: 800, 80



<Nine>

    name: "nine"

    Image:

        source: '***************'

        y: self.parent.y

        x: self.parent.x

        allow_stretch: True

        size: 800, 750

    Button:

        text: 'Back To Menu'

        id: button

        font_size: 40

        size: 300, 60

        size_hint: None, None

        on_release: app.root.current = "menu"

        pos: 100,13

    Button:

        text: root.a + ' WITH ' + root.b

        font_size: 40

        text_size: self.width, None

        size_hint: None, None

        halign: 'center'

        background_color: (0, 0, 0, 1)

        color: 1, 1, 1, 1

        pos: 0,520

        size: 800, 80

i am new to python and kivy both and this is the last thing which is holding me up from building my first app.i would be very thankful if someone could help me out.

First, some problems with your code. In every case where you have:

a = StringProperty()

b = StringProperty()

in your class definition, you follow it with:

a = myfile.readline(14)

and

b = myfile.readline(14)

That replaces your StringProperty with an ordinary String, and so eliminates the link with references like root.a and root.b in the kv file.

In order to get this to work, I changed your definition of ScreenFive to:

class ScreenFive(Screen):

    box = ScreenFour()

    a = StringProperty()

    b = StringProperty()



    def __init__(self, **kwargs):

        super(ScreenFive, self).__init__(**kwargs)



        myfile = open('grouptextinput.txt','r')

        print 'file is opened'

        self.a = myfile.readline(14)

        print self.a



        myfile = open('disabilitytextinput.txt','r')

        print 'file is opened'

        self.b = myfile.readline(14)

        print self.b

The above keeps a and b as StringProperty and allows the kv bindings to work. The next step is to update a and b in ScreenFive when you want the values to change. To do this, I modified your submit_textinput method in ScreenFour as:

def submit_textinput(self):

    self.grouptextinput = self.group_text_input.text

    print("group of people: {}".format(self.grouptextinput))

    App.get_running_app().sm.get_screen("screenfive").a = self.grouptextinput

    self.save()



    self.disabilitytextinput = self.disability_text_input.text

    print("with following disability: {}".format(self.disabilitytextinput))

    App.get_running_app().sm.get_screen("screenfive").b = self.disabilitytextinput

    self.save2()

The lines:

App.get_running_app().sm.get_screen("screenfive").a = self.grouptextinput

and:

App.get_running_app().sm.get_screen("screenfive").b = self.disabilitytextinput

update the StringProperty values in ScreenFive.

I also changed your MainApp:

class MainApp(App):



    def build(self):

        self.sm = presentation

        return presentation

to keep a reference to the ScreenManager.