Def does not accept more than two arguments, what is the reason and how to fix it (python kivy)?

Question

Python

When entering text in textinput and clicking on plusbtn, in theory, a button with the entered text should be added, however, Python gives this error: `TypeError: pluspress() missing 1 required positional argument: 'textinput'`. Here is the text of the program:

from kivy.app import App
from kivy.uix.button import Button
from kivy.uix.textinput import TextInput
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.gridlayout import GridLayout
from kivy.uix.label import Label
from kivy.config import Config

Config.set('graphics', 'width', '800')
Config.set('graphics', 'height', '400')
Config.set('graphics', 'resizable', '0')

class ThoughtApp(App):
    def build (self):
        base=(BoxLayout(orientation='vertical'))
        fl=FloatLayout()
        adduser=(Label(text='Добавить участника:',
        pos=(-120,360),
        font_size=22,
        bold=True,
        font_name='C:\Windows\Fonts\calibril.ttf',
        size_hint=(.6,.1)))
        fl.add_widget(adduser)
        textinput=(TextInput(multiline=False,
        pos=(225,355),
        size_hint=(.5,.15),
        font_size=16))
        fl.add_widget(textinput)
        plusbtn=(Button(size_hint=(27/800,30/800),
        text='+',
        pos=(635,366.5),
        on_press=self.pluspress,
        background_color=[.55,.55,.55,1],
        background_normal=''))
        fl.add_widget(plusbtn)
        base.add_widget(fl)
        names_gl=GridLayout(rows=1,)
        base.add_widget(names_gl)
        return base
    def pluspress(self,names_gl,textinput):
        names_gl.add_widget(Button(text=textinput.text,
        background_color=[.1,.9,.9,1],
        background_normal=''))
        textinput.text=''

if __name__ == '__main__':
    ThoughtApp().run()

Moreover, I tried to swap names_gl and textinput, and the same error occurred, but with names_gl. What is the cause of the error and how to fix it?

Answer 1

from kivy.app import App
from kivy.uix.button import Button
from kivy.uix.textinput import TextInput
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.gridlayout import GridLayout
from kivy.uix.label import Label
from kivy.config import Config

Config.set('graphics', 'width', '800')
Config.set('graphics', 'height', '400')
Config.set('graphics', 'resizable', '0')

class ThoughtApp(App):
    def build (self):
        base=(BoxLayout(orientation='vertical'))
        fl=FloatLayout()
        adduser=(Label(text='Добавить участника:',
        pos=(-120,360),
        font_size=22,
        bold=True,
        font_name='C:\Windows\Fonts\calibril.ttf',
        size_hint=(.6,.1)))
        fl.add_widget(adduser)
        self.textinput=(TextInput(multiline=False,
        pos=(225,355),
        size_hint=(.5,.15),
        font_size=16))
        fl.add_widget(self.textinput)
        plusbtn=(Button(size_hint=(27/800,30/800),
        text='+',
        pos=(635,366.5),
        on_press=self.pluspress,
        background_color=[.55,.55,.55,1],
        background_normal=''))
        fl.add_widget(plusbtn)
        base.add_widget(fl)
        self.names_gl=GridLayout(rows=1,)
        base.add_widget(self.names_gl)
        return base
    def pluspress(self, event):
        self.names_gl.add_widget(Button(text=self.textinput.text,
        background_color=[.1,.9,.9,1],
        background_normal=''))
        self.textinput.text=''

if __name__ == '__main__':
    ThoughtApp().run()