I have a kivy program where I need the labels to populate with the data given from a function within my screen class. It works with the update button properly however I would also like for it to populate the labels on load. Here is the python file and the kv file:
py:
JavaScript
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from kivy import *2
from kivy.app import App3
from kivy.clock import Clock4
from kivy.lang import Builder5
from kivy.uix.screenmanager import ScreenManager, Screen6
from kivy.properties import StringProperty7
import requests8
from bs4 import BeautifulSoup9
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class CurrentHighScores(Screen):13
highscore = None14
highscore_two = None15
highscore_three = None16
highscore_four = None17
highscore_five = None18
label_start_one = StringProperty(' ')19
label_start_two = StringProperty(' ')20
label_start_three = StringProperty(' ')21
label_start_four = StringProperty(' ')22
label_start_five = StringProperty(' ')23
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def speed_scraper(self):25
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URL = 'http://algoodspeeders.org/alpr/speederid.php'27
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headers = {29
"User-Agent": "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36"}30
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page = requests.get(URL, headers=headers)32
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soup = BeautifulSoup(page.content, 'html.parser')34
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indexes = [3, 5]36
speed_data = []37
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for tbody in soup.findAll('tbody'):39
for tr in tbody.findAll('tr'):40
speed_values = [td.text for td in tr.findAll('td')]41
speed_vals = [speed_values[x] for x in indexes]42
speed_data.append(speed_vals)43
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speed_data.sort(reverse=True)45
# print(speed_data[0:5])46
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self.highscore = speed_data[0]48
self.highscore_two = speed_data[1]49
self.highscore_three = speed_data[2]50
self.highscore_four = speed_data[3]51
self.highscore_five = speed_data[4]52
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self.ids.high_one.text = '1st: ' + str(self.highscore[0]) + ' MPH | ' + 'License Plate No. ' + str(54
self.highscore[1])55
self.ids.high_two.text = '2nd: ' + str(self.highscore_two[0]) + ' MPH | ' + 'License Plate No. ' + str(56
self.highscore_two[1])57
self.ids.high_three.text = '3rd: ' + str(self.highscore_three[0]) + ' MPH | ' + 'License Plate No. ' + str(58
self.highscore_three[1])59
self.ids.high_four.text = '4th: ' + str(self.highscore_four[0]) + ' MPH | ' + 'License Plate No. ' + str(60
self.highscore_four[1])61
self.ids.high_five.text = '5th: ' + str(self.highscore_five[0]) + ' MPH | ' + 'License Plate No. ' + str(62
self.highscore_five[1])63
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print('High Scores List')65
print('----------------')66
print('1st: ' + str(self.highscore[0]) + ' MPH | ' + 'License Plate No. ' + str(self.highscore[1]))67
print('2nd: ' + str(self.highscore_two[0]) + ' MPH | ' + 'License Plate No. ' + str(self.highscore_two[1]))68
print('3rd: ' + str(self.highscore_three[0]) + ' MPH | ' + 'License Plate No. ' + str(self.highscore_three[1]))69
print('4th: ' + str(self.highscore_four[0]) + ' MPH | ' + 'License Plate No. ' + str(self.highscore_four[1]))70
print('5th: ' + str(self.highscore_five[0]) + ' MPH | ' + 'License Plate No. ' + str(self.highscore_five[1]))71
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class ScreenManage(ScreenManager):74
pass75
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kv = Builder.load_file('algoodspeed.kv')78
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class AlgoodSpeedApp(App):81
def build(self):82
return kv83
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if __name__ == '__main__':86
AlgoodSpeedApp().run()87
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.kv:
JavaScript
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ScreenManage:2
CurrentHighScores:3
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<CurrentHighScores>5
name: 'CurrentHighScores'6
GridLayout:7
cols: 18
Label:9
name: 'current_high_scores'10
text: 'Current High Speeds For Cooper Rd:'11
font_size: 3012
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Label:14
id: high_one15
text: root.label_start_one16
Label:17
id: high_two18
text: root.label_start_two19
Label:20
id: high_three21
text: root.label_start_three22
Label:23
id: high_four24
text: root.label_start_four25
Label:26
id: high_five27
text: root.label_start_five28
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Button:30
id: update31
text: 'Update Current High Speeds'32
on_release:33
root.speed_scraper()34
I have tried using things like clock to delay the function call outside of the class but that doesn’t help at all. Thanks for the help!
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Answer
Thanks to a comment on my question I did some more research and reworked the code slightly and this were my findings for anyone else who is having this issue. I use on_pre_enter to call my function and within the function simply update the “label” variables I have to change the text within the kv file. Here is how it looks. I left some of the old code in but commented it out so you can see kind of how it looked before:
.py:
JavaScript
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from kivy import *2
from kivy.app import App3
from kivy.clock import Clock4
from kivy.lang import Builder5
from kivy.uix.screenmanager import ScreenManager, Screen6
from kivy.properties import StringProperty7
import requests8
from bs4 import BeautifulSoup9
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class CurrentHighScores(Screen):12
def on_pre_enter(self, *args):13
self.speed_scraper()14
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highscore = None16
highscore_two = None17
highscore_three = None18
highscore_four = None19
highscore_five = None20
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label_start_one = StringProperty(' ')23
label_start_two = StringProperty(' ')24
label_start_three = StringProperty(' ')25
label_start_four = StringProperty(' ')26
label_start_five = StringProperty(' ')27
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def speed_scraper(self):29
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URL = 'http://algoodspeeders.org/alpr/speederid.php'32
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headers = {34
"User-Agent": "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36"}35
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page = requests.get(URL, headers=headers)37
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soup = BeautifulSoup(page.content, 'html.parser')39
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indexes = [3, 5]41
speed_data = []42
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for tbody in soup.findAll('tbody'):44
for tr in tbody.findAll('tr'):45
speed_values = [td.text for td in tr.findAll('td')]46
speed_vals = [speed_values[x] for x in indexes]47
speed_data.append(speed_vals)48
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speed_data.sort(reverse=True)50
# print(speed_data[0:5])51
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self.highscore = speed_data[0]53
self.highscore_two = speed_data[1]54
self.highscore_three = speed_data[2]55
self.highscore_four = speed_data[3]56
self.highscore_five = speed_data[4]57
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self.label_start_one = ('1st: ' + str(self.highscore[0]) + ' MPH | ' + 'License Plate No. ' + str(59
self.highscore[1]))60
self.label_start_two = ('2nd: ' + str(self.highscore_two[0]) + ' MPH | ' + 'License Plate No. ' + str(61
self.highscore_two[1]))62
self.label_start_three = ('3rd: ' + str(self.highscore_three[0]) + ' MPH | ' + 'License Plate No. ' + str(63
self.highscore_three[1]))64
self.label_start_four = ('4th: ' + str(self.highscore_four[0]) + ' MPH | ' + 'License Plate No. ' + str(65
self.highscore_four[1]))66
self.label_start_five = ('5th: ' + str(self.highscore_five[0]) + ' MPH | ' + 'License Plate No. ' + str(67
self.highscore_five[1]))68
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'''self.ids.high_one.text = '1st: ' + str(self.highscore[0]) + ' MPH | ' + 'License Plate No. ' + str(70
self.highscore[1])71
self.ids.high_two.text = '2nd: ' + str(self.highscore_two[0]) + ' MPH | ' + 'License Plate No. ' + str(72
self.highscore_two[1])73
self.ids.high_three.text = '3rd: ' + str(self.highscore_three[0]) + ' MPH | ' + 'License Plate No. ' + str(74
self.highscore_three[1])75
self.ids.high_four.text = '4th: ' + str(self.highscore_four[0]) + ' MPH | ' + 'License Plate No. ' + str(76
self.highscore_four[1])77
self.ids.high_five.text = '5th: ' + str(self.highscore_five[0]) + ' MPH | ' + 'License Plate No. ' + str(78
self.highscore_five[1])79
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print('High Scores List')81
print('----------------')82
print('1st: ' + str(self.highscore[0]) + ' MPH | ' + 'License Plate No. ' + str(self.highscore[1]))83
print('2nd: ' + str(self.highscore_two[0]) + ' MPH | ' + 'License Plate No. ' + str(self.highscore_two[1]))84
print('3rd: ' + str(self.highscore_three[0]) + ' MPH | ' + 'License Plate No. ' + str(self.highscore_three[1]))85
print('4th: ' + str(self.highscore_four[0]) + ' MPH | ' + 'License Plate No. ' + str(self.highscore_four[1]))86
print('5th: ' + str(self.highscore_five[0]) + ' MPH | ' + 'License Plate No. ' + str(self.highscore_five[1]))87
'''88
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class ScreenManage(ScreenManager):90
pass91
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kv = Builder.load_file('algoodspeed.kv')94
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class AlgoodSpeedApp(App):97
def build(self):98
return kv99
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if __name__ == '__main__':102
AlgoodSpeedApp().run()103
.kv
JavaScript
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ScreenManage:2
CurrentHighScores:3
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<CurrentHighScores>5
name: 'CurrentHighScores'6
on_enter: print('working')7
GridLayout:8
cols: 19
Label:10
name: 'current_high_scores'11
text: 'Current High Speeds For Cooper Rd:'12
font_size: 3013
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Label:15
id: high_one16
text: root.label_start_one17
Label:18
id: high_two19
text: root.label_start_two20
Label:21
id: high_three22
text: root.label_start_three23
Label:24
id: high_four25
text: root.label_start_four26
Label:27
id: high_five28
text: root.label_start_five29
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Button:31
id: update32
text: 'Update Current High Speeds'33
on_release:34
root.speed_scraper()35
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