help with AttributeError: object has no attribute

[Gabriel de Jesus]

Good evening. I am having trouble understanding an error in the project I am working on. I am creating a function to change pages in a registration form, so I create the "next" function and refer to the "on_release" event in my KV code. However, when I run the application, the terminal gives me the error "AttributeError: object has no attribute". Can someone help me? Below is the code. Thank you in advance and I will be grateful for any help.

return at the terminal:

code:

import os

from kivy.lang.builder import Builder

from kivy.uix.screenmanager import Screen

Builder.load_string(

    """

<forget_password>:

    MDFloatLayout:

        md_bg_color: rgba(240, 240, 240, 240)

        MDFloatLayout:

            size_hint: 1, .1

            pos_hint: {"center_y": .95}

           

            canvas:

                Color:

                    rgba: app.theme_cls.primary_color

                RoundedRectangle:

                    pos: self.pos

                    size: self.size

                    radius: [0, 0, 15, 15 ]

            MDLabel:

                text: "Password Recovery"

                font_size: "19sp"

                color: 1, 1, 1, 1

                font_name: "fontes/RobotoCondensed-Bold.ttf"

                halign: "center"

                pos_hint: {'center_x': 0.5,'center_y': 0.5}  

            MDIconButton:

                icon: "arrow-left"

                pos_hint: {'center_x': 0.1,'center_y': 0.5}

                theme_icon_color: "Custom"

                icon_color: 1, 1, 1, 1

        MDFloatLayout:

            MDCard:

                size_hint: .8, .45

                pos_hint: {"center_x": .5, "center_y": .5}

                elevation: 3

                shadow_softness: 8

                Carousel:

                    id: slide

                    MDFloatLayout:

                        MDLabel:

                            text: "Please enter the registered email address"

                            font_name: "fontes/Poppins/Poppins-Regular.ttf"

                            font_size: "12sp"

                            pos_hint: {"center_x": .5, "center_y": .8}

                            halign: "center"

                            opacity: .7

                        MDTextField:

                            hint_text: "mail"                        

                            size_hint_x: .8

                            pos_hint: {"center_x": .5, "center_y": .58}

                        MDRaisedButton:

                            text: "Send"

                            pos_hint: {"center_x": .5, "center_y": .25}

                            font_name: "fontes/RobotoCondensed-Bold.ttf"

                            font_size: "16sp"

                            size_hint_x: .8

                            on_release: app.next() #event reference to function

fff

                    MDFloatLayout: #sends a 6-digit verification code to the registered email address

                        MDLabel:

                            text: " Enter the verification code that we sent to the informed e-mail"

                            font_name: "fontes/Poppins/Poppins-Regular.ttf"

                            font_size: "12sp"

                            pos_hint: {"center_x": .5, "center_y": .8}

                            halign: "center"

                            opacity: .7

                        MDFloatLayout:

                            size_hint: .8, .18

                            #md_bg_color: 0, 0, 0, 1

                            pos_hint: {"center_x": .5, "center_y": .53}

                           

                             

                            MDTextField:

                                id: cx_1

                                hint_text: ""  

                                halign: "center"                        

                                size_hint_x: .13

                                pos_hint: {"center_x": .03, "center_y": .58}

                               

                                   

                            MDTextField:

                                id: cx_2

                                hint_text: ""

                                halign: "center"                          

                                size_hint_x: .13

                                pos_hint: {"center_x": .22, "center_y": .58}

                           

                            MDTextField:

                                id: cx_3

                                hint_text: ""

                                halign: "center"                        

                                size_hint_x: .13

                                pos_hint: {"center_x": .42, "center_y": .58}

                           

                            MDTextField:

                                id: cx_4  

                                hint_text: ""

                                halign: "center"                          

                                size_hint_x: .13

                                pos_hint: {"center_x": .6, "center_y": .58}

                            MDTextField:

                                id: cx_5

                                hint_text: ""  

                                halign: "center"                        

                                size_hint_x: .13

                                pos_hint: {"center_x": .78, "center_y": .58}

                             

                            MDTextField:

                                id: cx_6

                                hint_text: ""  

                                halign: "center"                

                                size_hint_x: .13

                                pos_hint: {"center_x": .97, "center_y": .58}

                                 

                 

                        #user authentication      

                        MDRaisedButton: #Button

                            text: "Next"

                            pos_hint: {"center_x": .5, "center_y": .25}

                            font_name: "fontes/RobotoCondensed-Bold.ttf"

                            font_size: "16sp"

                            size_hint_x: .8

"""

)

class forget_password(Screen):

   

    def next(self):

        self.root.ids.slide_load.next(mode='next')

[Elliot Garbus]

on_release: app.next()   #event reference to function

 

The problem is that the next() method is not defined in app, it is defined in forgot_passwords.  Change the on_release line:

 

on_release: root.next()   #event reference to function

 

in kv, root refers to the enclosing class. Or the root widget of the kv rule.  See: https://kivy.org/doc/stable/api-kivy.lang.html?highlight=lang#value-expressions-on-property-expressions-ids-and-reserved-keywords

 

 

From: Gabriel de Jesus
Sent: Thursday, December 8, 2022 5:10 PM
To: kivy-...@googlegroups.com
Subject: [kivy-users] help with AttributeError: object has no attribute

 

Good evening. I am having trouble understanding an error in the project I am working on. I am creating a function to change pages in a registration form, so I create the "next" function and refer to the "on_release" event in my KV code. However, when I run the application, the terminal gives me the error "AttributeError: object has no attribute". Can someone help me? Below is the code. Thank you in advance and I will be grateful for any help.

 

return at the terminal:

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[Gabriel de Jesus]

thank you very much. It worked out well! 

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