I have the following script in python kivy that counts how many records there are in a table in the database and according to the total it shows an image n[] times.
If the total record is 4 and I do a print[numero] it prints 0,1,2,3, it's ok.
But when I want to show an image "weight.png" 4 times it doesn't show it and gives me an error: AttributeError: 'super' object has no attribute '__getattr__'
Here code:
rollo.py
from email.mime import image
from itertools import count
from logging import root
import kivy
from kivy.app import App
from kivy.lang import Builder
from kivy.config import Config
from kivy.uix.gridlayout import GridLayout
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.screenmanager import Screen
import time
import serial
import psycopg2
from datetime import datetime, timezone
from kivy.uix.image import Image
from kivy.properties import StringProperty
from inicio import Inicio
class Rollo(Screen):
def __init__(self, **kwargs):
super(Rollo, self).__init__(**kwargs)
print('inicie')
#connect DB
con = psycopg2.connect(
host = "localhost",
database = "appsenior",
user = "postgres",
password = "qq")
cur = con.cursor()
#contar cantidad de rollos pesados
consulta = "SELECT count(*) pesos FROM peso_materia WHERE id_parada=100"
cur.execute(consulta)
rows = cur.fetchone()
numero = 0
#example rows[0] = 4 loop con 4
while numero < rows[0]:
#It should show me the image peso.png in the corresponding image id
self.ids.carga[numero] = StringProperty('peso.png')
numero = numero + 1
kivy.require('2.0.0')
Config.set('graphics', 'resizable', True)
Builder.load_file('rollo.kv')
class Root(GridLayout):
pass
class Main(App):
def build(self):
return Root()
if __name__ == '__main__':
Main().run()
rollo.kv
<Rollo@Screen>
name:'rollo'
canvas:
Color:
rgba: .9,.9,.9,1
Rectangle:
size: self.size
BoxLayout:
orientation: 'vertical' #Arrange four child objects vertically
BoxLayout:
size_hint_y: 0.2 #Vertical width 10%Occupy
Button: #Button to change the theme
size_hint_x: 0.3 #Width 30%Occupy
text: 'Peso de Rollos'
background_color: 0.9,0.1,0.9, 1
Button: #Show theme
size_hint_x: 0.3 #Width 70%Occupy
text: 'Peso de Bultos'
background_color: 0.1,0.1,0.1, 1
Button: #Show theme
size_hint_x: 0.3 #Width 70%Occupy
text: 'Peso de Canutos'
background_color: 0.1,0.1,0.1, 1
BoxLayout: #labels
size_hint_y: 0.1
canvas.before:
Color:
rgba: 4, .4, 0, 1
Rectangle:
pos: self.pos
size: self.size
Label:
text: '#1'
Label:
text: '#2'
Label:
text: '#3'
Label:
text: '#4'
Label:
text: '#5'
Label:
text: '#6'
Label:
text: '#7'
Label:
text: '#8'
Label:
text: '#9'
Label:
text: '#10'
Label:
text: '#11'
Label:
text: '#12'
BoxLayout:
size_hint_y: 0.2
id:boxcargan
Image:
id: carga0
Image:
id: carga1
source: ''
Image:
id: carga2
source: ''
Image:
id: carga3
source: ''
Image:
id: carga4
source: ''
Image:
id: carga5
source: ''
Image:
id: carga6
source: ''
Image:
id: carga7
source: ''
Image:
id: carga8
source: ''
Image:
id: carga9
source: ''
Image:
id: carga10
source: ''
Image:
id: carga11
source: ''
BoxLayout:
Label:
id: lblcorrecto
text:''
size_hint_y: 0.7
color: 237 , 112 , 64 , 1
font_size: 20
BoxLayout:
Label: #Canvas part (provisional)
text: 'POR FAVOR, COLOQUE EL ROLLO A PESAR'
size_hint_y: 0.9
color: 1 , 0 , 0 , 1
size_hint_x: 0.9
BoxLayout:
size_hint_y: 0.1 #Vertical width 10%Occupy
Button: #Undo button
text: 'PESAR'
on_press: root.extraer_peso()
Button: #All erase button
text: 'FINALIZAR'
You can't access ids that way, and you should change the source property of the Image instead of using a StringProperty. Try changing:
self.ids.carga[numero] = StringProperty('peso.png')
to:
self.ids["carga" + str(numero)].source = 'peso.png'
But the ids will not be available in the __init__() method (they will not have been set yet). So you just need to delay using them slightly, which you can do with Clock.schedule_once(). Here is a modified version of your Rollo class that does it:
class Rollo(Screen):
def __init__(self, **kwargs):
super(Rollo, self).__init__(**kwargs)
print('inicie')
Clock.schedule_once(self.setup)
def setup(self, dt):
# connect DB
con = psycopg2.connect(
host="localhost",
database="appsenior",
user="postgres",
password="qq")
cur = con.cursor()
# contar cantidad de rollos pesados
consulta = "SELECT count(*) pesos FROM peso_materia WHERE id_parada=100"
cur.execute(consulta)
rows = cur.fetchone()
numero = 0
# example rows[0] = 4 loop con 4
while numero < rows[0]:
# It should show me the image peso.png in the corresponding image id
self.ids['carga' + str(numero)].source = 'peso.png'
numero = numero + 1