AttributeError: 'float' object has no attribute 'size'

[Gaurav Bhoi]

Hello guys i m getting this error please explain me why i m getting this error and help me solve it i m pesting codes and error snap down 

python code: 

from kivy.app import App
from kivy.clock import Clock
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.label import Label

class Box(BoxLayout):
def data(self):
#some operation
msg = 'test'
Box.Add_Data(self, msg)

def Add_Data(self, message):
lbl = Label(text=message, font_size=17, text_size=self.size,
halign='right', valign='middle', padding=(20, 0),
height=self.minimum_height - 10, size_hint_y=None)
self.ids.messages.add_widget(lbl)

class Test(App):
def build(self):
Clock.schedule_interval(Box.data, .1)
return Box()

if __name__ == '__main__':
Test().run()

[Gaurav Bhoi]

i accidently posted this message half written. so i m writting this again

python :

from kivy.app import App

from kivy.clock import Clock

from kivy.uix.boxlayout import BoxLayout

from kivy.uix.label import Label

class Box(BoxLayout):

    def data(self):

        #some operation

        msg = 'test'

        Box.Add_Data(self, msg)

    def Add_Data(self, message):

        lbl = Label(text=message, font_size=17, text_size=self.size,

                    halign='right', valign='middle', padding=(20, 0),

                    height=self.minimum_height - 10, size_hint_y=None)

        self.ids.messages.add_widget(lbl)

class Test(App):

    def build(self):

        Clock.schedule_interval(Box.data, .1)

        return Box()

if __name__ == '__main__':

    Test().run()

kv code:

<Box>:

    ScrollView:

        BoxLayout:

            id: messages

            orientation: 'vertical'

            size_hint_y: None

            height: self.minimum_height

            #padding: 20

error:

[Elliot Garbus]

I made the following changes to your python code as detailed in the comments.

There are some basics of OOP that I think you would benefit from, I like this article: https://realpython.com/python3-object-oriented-programming/

 

 

from kivy.app import App
from kivy.clock import Clock
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.label import Label


class Box

(BoxLayout):
    def data(self, dt):  # the callback for a Clock.schedule_once gets passed dt
        #some operation
        msg = 'test'
        self.add_data(msg)  # Box.add_message could only be used if add_data was a static method

    def add_data(self, message):  # Python convention for method names, see PEP8
        lbl = Label(text=message, font_size=17, text_size=self.size,
                    halign='right', valign='middle', padding=(20, 0),
                    height=25, size_hint_y=None)  # set the height of the label
        self.ids.messages.add_widget(lbl)

class TestApp(App):
    def build(self):
        b = Box()    # instance the class
        Clock.schedule_interval(b.data, .1)  # use the instance to set the callback
        return b

if __name__ == '__main__':
    TestApp().run()

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