How to add a widget in GridLayout?(kivy+python) - python-3.x

Question

How do I add a widget via python? What is my mistake?
I want to add a widget using the button.How to apply correctly?
In python format:
from kivy.app import App
from kivy.uix.floatlayout import FloatLayout
from kivy.lang import Builder
from kivy.core.window import Window
Window.size = (320, 720)
Builder.load_file('my.kv')
class Container(FloatLayout):
def minus(self):
self.fp.add_widget(TextInput(text="1103"))
print("ok")
class MyApp(App):
def build(self):
return Container()
if __name__ == "__main__":
MyApp().run()
In kiwy format:
<Container>
fp: fp
FloatLayout:
orientation: "vertical"
Button:
text : "Системы"
size_hint : (0.3, 0.1)
pos_hint : {'x':0.05, 'y':0.9}
font_size : "20sp"
Button:
text : "Локодром"
size_hint : (0.3, 0.1)
pos_hint : {'x':0.35, 'y':0.9}
font_size : "20sp"
Button:
text : "Задачи"
size_hint : (0.3, 0.1)
pos_hint : {'x':0.65, 'y':0.9}
font_size : "20sp"
BoxLayout:
orientation: "horizontal"
cols: 3
size_hint: 0.9,0.975
pos_hint: {'center_x':.5}
Button:
text : "<-"
size_hint : (0.05, 0.05)
font_size : "20sp"
pos_hint: {'top': 0.91}
Label:
text : "19.11.2022"
size_hint : (0.2, 0.05)
font_size : "20sp"
pos_hint: {'top': 0.91}
Button:
text : "->"
size_hint : (0.05, 0.05)
font_size : "20sp"
pos_hint: {'top': 0.91}
TextInput:
text : ""
size_hint:(0.47, 0.05)
pos_hint:{'x': 0.05, 'y': 0.78}
font_size : "18sp"
Button:
text : "Поиск"
size_hint:(0.2, 0.05)
pos_hint:{'x': 0.536, 'y': 0.78}
font_size : "15sp"
Button:
text : "Убрать"
size_hint : (0.2, 0.05)
pos_hint : {'x':0.75, 'y':0.78}
font_size : "15sp"
Label:
text : "S"
size_hint : (0.1, 0.05)
pos_hint : {'x': 0.03, 'y': 0.72}
font_size : "20sp"
Label:
text : "№"
size_hint : (0.15, 0.05)
pos_hint : {'x': 0.12, 'y': 0.72}
font_size : "20sp"
Label:
text : "Описание"
size_hint : (0.53, 0.05)
pos_hint : {'x': 0.25, 'y': 0.72}
font_size : "20sp"
Label:
text : "Прим."
size_hint : (0.18, 0.05)
pos_hint : {'x': 0.77, 'y': 0.72}
font_size : "20sp"
BoxLayout:
orientation: 'vertical'
Label:
text: ""
size_hint : (0.18, 0.53)
ScrollView:
size_hint: 0.9,1
pos_hint: {'center_x':.5}
GridLayout:
id:fp
size_hint_y:None
height: self.minimum_height
cols: 4
cols_minimum: {0: 10, 1: 30, 2: 140, 3: 50}
TextInput:
text: 'Filler'
size_hint:1,None
height:40
Label:
text: ''
size_hint : (0.18, 0.2)
BoxLayout:
orientation: "horizontal"
cols: 3
padding: 20
Button:
text : "Удалить"
size_hint:(0.29, 0.07)
pos_hint: {'top': 0.07}
font_size : "15sp"
on_press: root.minus()
Button:
text : "Добавить"
size_hint : (0.29, 0.07)
pos_hint: {'top': 0.07}
font_size : "15sp"
Button:
text : "Сохранить"
size_hint : (0.29, 0.07)
pos_hint: {'top': 0.07}
font_size : "15sp"
I thought that by referring to the id I would get a new widget
self.fp.add_widget(TextInput(text="1103"))
Но получаю enter image description here
Help please

Answer 1

You can do it this way, see the kivy doc (https://kivy.org/doc/stable/guide/widgets.html):
layout = BoxLayout(padding=10)
button = Button(text='My first button')
layout.add_widget(button)