Where should methods be placed; ids vs NumericProperty; kivy - python-3.x

Question

I have a very basic kivy code. I have the .py file and the .kv file. The questions are: where should the methods be placed? In this example the 2 methods that interact are 'def GetTicker(ticker):' and 'def GetTickers(self):'. I have placed both outside of any class, because I could not get the code to work otherwise; however I think the proper way to code would be to place them inside the 'app' class.
As an aside I am very confused about where/when the 'self' should be passed. I'm working by trial and error here.
Then there is the 'NumericProperty'. I read here that when it is updated, it automatically updates the widgets that are associated with it. It doesn't for me, therefore I had to create Id's for some labels; but the id's won't work at the beginning of the run, only on update.
I'm using python 3.9 and kivy 2.0.0, PyCharm 2021.3.1 (Community Edition) on win10 box.
Any and all assistance will be greatly appreciated.
Ray
the .py file
from kivy.app import App
from kivy.properties import NumericProperty
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.gridlayout import GridLayout
from kivy.uix.textinput import TextInput
from kivy.core.window import Window
Window.size = (300, 300)
import time
from yahoo_fin.stock_info import get_live_price # This API only gets the live price
from yahoo_fin import stock_info as si # This is SLOWER than the above API, buts gets more info
class MyBoxLayout(BoxLayout):
def __init__(self, **kwargs):
super().__init__(**kwargs)
def press(self):
name = self.ids.ticker_name.text.upper()
self.ids.ticker_value.text = self.GetTicker(name)
def update(self):
#GetTickers(self) # This won't work here :(
self.ids.mydow_price.text, self.ids.mydow_chg = self.GetTicker("^DJI")
self.ids.mysp_price.text, self.ids.mysp_chg = self.GetTicker("^GSPC")
self.ids.mynasdaq_price.text, self.ids.mynasdaq_chg.text = self.GetTicker("^IXIC")
self.ids.myeuro_price, self.ids.myeuro_chg.text = self.GetTicker("EURUSD=X")
#print(self.ids.amazon_id.text)
class MyOtherBoxlayout(BoxLayout):
pass
class MyTicker(TextInput):
pass
class gridlayout(GridLayout):
pass
def GetTicker(ticker):
# data = get_live_price(ticker)
data = si.get_quote_table(ticker)
price = data['Quote Price']
change = price - data['Previous Close']
# print("Price: %.3f" % price)
# print("Change: %.3f" % change)
return [str("%s" % format(price, ',.3f')), str("%s" % format(change, ',.3f'))]
def GetTickers(self):
self.dow_price, self.dow_chg = self.GetTicker("^DJI")
self.sp_price, self.sp_chg = self.GetTicker("^GSPC")
self.nasdaq_price, self.nasdaq_chg = self.GetTicker("^IXIC")
self.euro_price, self.euro_chg = self.GetTicker("EURUSD=X")
# This is the app class
class StockTickerApp(App):
def __init__(self, **kwargs):
super().__init__(**kwargs)
App.title = "Ray's Stock Ticker"
dow_price = NumericProperty(0.00)
dow_chg = NumericProperty(0.00)
sp_price = NumericProperty(0.00)
sp_chg = NumericProperty(0.00)
nasdaq_price = NumericProperty(0.00)
nasdaq_chg = NumericProperty(0.00)
euro_price = NumericProperty(0.00)
euro_chg = NumericProperty(0.00)
start_time = time.time()
self.GetTickers()
end_time = time.time()
print (end_time - start_time)
# and its run here
StockTickerApp().run()
the .kv file
MyBoxLayout:
<MYLabel#ButtonBehavior+Label>: # this is something I found that helps make a label behave
# like a button.
<MyBoxLayout>:
canvas.before:
Color:
rgba: (153/255, 255/255, 255/255, 1)
Rectangle:
pos: self.pos
size: self.size
padding: ("15dp", "15dp", "15dp", "15dp") #left, top, right, bottom
spacing: "10dp"
orientation: "vertical"
#
# 1st widget
#
Label:
text: "Stocks Ticker"
size_hint: 1, .1
#pos_hint: {"top": 1}
color:0,0,0,1
#
# 2nd widget
#
BoxLayout:
canvas.before:
Color:
rgba: (19/255,202/255,55/255,1) # lime more intense
Rectangle:
pos: self.pos
size: self.size
padding: ("10dp", "0dp", "15dp", "0dp")
spacing: "20dp"
orientation: "horizontal"
size_hint: 1, .4
#pos_hint: {"center": .5}
Label:
text: " Enter Stock"
size_hint: .6, .5
pos_hint: {"center_X":.5, "top": .7}
color: 72/255,89/255,89/255,1
MyTicker: # this is a textinput widget
id: ticker_name
text: ""
size_hint: .6, .6
pos_hint: {"top": .8}
Label:
id: ticker_value
#text: " Enter Stock"
size_hint: .5, .1
color: 0,0,0,1
pos_hint: {"top":.5, "center": 1}
#
# 3rd widget
#
BoxLayout:
size_hint: 1, .3
Button:
#id: "Find_Value"
text: "Find Value"
on_press: root.press()
#
# 4th widget
#
gridlayout:
canvas.before:
Color:
rgba: (19/255,202/255,55/255,1) # lime more intense
Rectangle:
pos: self.pos
size: self.size
rows: 4
cols: 3
padding: "10dp"
MYLabel:
color: 72/255,89/255,89/255,1
text: "Dow"
text_size: self.size
halign: 'left'
on_press: root.update()
MYLabel:
id: mydow_price
color: 0,0,0,1
text: app.dow_price
text_size: self.size
halign: 'right'
on_press: root.update()
MYLabel:
id: mydow_chg
color: 0,0,0,1
text: app.dow_chg
text_size: self.size
halign: 'right'
on_press: root.update()
MYLabel:
text: "S&P 500"
color: 72/255,89/255,89/255,1
text_size: self.size
halign: 'left'
on_press: root.update()
MYLabel:
id: mysp_price
text: app.sp_price
color: 0,0,0,1
text_size: self.size
halign: 'right'
MYLabel:
id: mysp_chg
text: app.sp_chg
color: 0,0,0,1
text_size: self.size
halign: 'right'
MYLabel:
text: "Nasdaq"
color: 72/255,89/255,89/255,1
text_size: self.size
halign: 'left'
on_press: root.update()
MYLabel:
id: mynasdaq_price
text: app.nasdaq_price
color: 0,0,0,1
text_size: self.size
halign: 'right'
MYLabel:
id: mynasdaq_chg
text: app.nasdaq_chg
color: 0,0,0,1
text_size: self.size
halign: 'right'
MYLabel:
text: "Euro/USD"
color: 72/255,89/255,89/255,1
text_size: self.size
halign: 'left'
on_press: root.GetTickers()
MYLabel:
id: myeuro_price
text: app.euro_price
color: 0,0,0,1
text_size: self.size
halign: 'right'
MYLabel:
id: myeuro_chg
text: app.euro_chg
color: 0,0,0,1
text_size: self.size
halign: 'right'