kivy app gives error "invalid data afet declaration"

[Mohit Varshney 139]

im new to kivy world
i wrote a simple application that showes a button and a label

but it gives me an error "invalid data after declaration

here i am attaching screenshort of my code please anyone can help me in this

[Elliot Garbus]

Please share code, not pictures. To retain formatting right-click and select paste as plain-text. 

There are changes I’d suggest. 

If you’re going to define a __init__ in kivy, you must pass the keyword arguments. 

def __init__(self, **kwargs):

    super().__init__(**kwargs)

In your case you can just delete the code, you are not executing any of you own code. 

Also in the kv code remove the redundant parentheses around orientation: “vertical“

The Labels and Buttons must be indented under the Layout. 

Sent from my iPhone

On Oct 28, 2023, at 9:03 AM, Mohit Varshney 139 <hello....@gmail.com> wrote:

im new to kivy world

i wrote a simple application that showes a button and a label

but it gives me an error "invalid data after declaration

here i am attaching screenshort of my code please anyone can help me in this

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<Screenshot 2023-10-28 213222.png>

<Screenshot 2023-10-28 213132.png>

[Mohit Varshney 139]

kivy code

<main_root>:

    random_pass : random_pass

    BoxLayout:

    # orientation:'vertical'

   

    Label:

        text:"passsword generator"

        font_size: 60

        color:0.92,0.45,0

    Label:

        id: random_pass

        text:"-"    

        font_size:60

    Button:

        text:"generate"

        font_size:30

        size:75,40  

        on_press : root.generate_pass()

To view this discussion on the web visit https://groups.google.com/d/msgid/kivy-users/268CDA07-7476-4A09-A380-C3DC073E2E01%40cox.net.

[Mohit Varshney 139]

python code

import kivy

from kivy.app import App

from kivy.uix.layout import Layout

from kivy.uix.boxlayout import BoxLayout

from tkinter import *

import random, string

import pyperclip as pc

# from kivy.uix.main_root import main_root

import random

class main_root(BoxLayout):

   def __init__(self , **kwargs):

      super(main_root,self).__init__()

def generate_pass(self):

             self.random_pass.text = str(random.randint(0,100))

   

class password_generator(App):

    def build(self):

        return main_root()

password_generator = password_generator()    

password_generator.run()  

   

[elli...@cox.net]

Here are the fixes.  Let me know if this works for you, happy to answer any questions.

In the python code,

Class names changed to CapCase

generate_pass() is indented so that it is a method of MainRoot.

__Init__() method is removed.  If you are going to use the __init__ method you want to pass the keywords args to the parent class

 

    def __init__(self, **kwargs):

        super().__init__(**kwargs)

 

In the kv code:

File name is changed to passwordgenerator to match new App class name.

Uncommented orientation

Indented the widgets so they are under the BoxLayout.

Sized the Button.  Note to size a widget you must turn off the hint by setting it to None.

 

 

Python Code:

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout

import random


class MainRoot(BoxLayout):  # python convention classes are in CapCase
    # def __init__(self, **kwargs):
    #     super(main_root, self).__init__() # change to super().__init__(**kwargs)

    def generate_pass(self):
        self.random_pass.text = str(random.randint(0, 100))


class PasswordGenerator(App):  # python convention classes are in CapCase
    def build(self):
        return MainRoot()


password_generator = PasswordGenerator()
password_generator.run()

passwordgenerator.kv # note the file name has changed.

<MainRoot>:
    random_pass : random_pass
    BoxLayout:
        orientation:'vertical'
        Label:
            text:"passsword generator"
            font_size: 60
            color:0.92,0.45,0
        Label:
            id: random_pass
            text:"-"
            font_size:60
        Button:
            text:"generate"
            size_hint_y: None
            height: dp(48)
            font_size:30
#            size:75,40  Must set size_hint to None to set size
            on_press : root.generate_pass()

To view this discussion on the web visit https://groups.google.com/d/msgid/kivy-users/CAJuAB8dWtaXGYGhE14bDEBP9prTY2QRJ_Kuss9ZsFpe6otnVow%40mail.gmail.com.