How can I remove or insert an item from an instantiated listbox in another class?-CodePudding

Good afternoon in this script I am trying to do the following tasks but they throw an error:

1- access the value that listbox has from the instantiator class.

2- delete the entire list of Listbox from a call of the Spinbox class to the Parent class: Frame_ class

I do not know if what I intend is well structured in the script or my logic is incorrect. A suggestion please. Thank you...

from tkinter import *

class Frame_class(Frame):
    def __init__(self, parents, *args, **kwargs):
        Frame.__init__(self, parents, *args, kwargs)
        self.listbox = Listbox_class (self, width=11, height=1)
        self.listbox .pack() 

        self.spinbox = Spinbox_class (self, width=11)
        self.spinbox .pack()
        
        # from here I want to get the value of 
        # the first item of listbox or delete it     

    def delete(self, number):
        if number == 1:
            self.listbox.delete(0, END)
        if number == 2:
            self.listbox.delete(0, 1)


class Listbox_class(Listbox, Frame_class):

    def __init__(self, master, **kwargs):
        Listbox.__init__(self, master, **kwargs)       
        self.config (font=('Calibri',9,'bold'))
        self.insert(0, 'banana1')
        self.insert(0, 'orange1')



class Spinbox_class(Spinbox, Frame_class):

    def __init__(self, master, **kwargs):
        Spinbox.__init__(self, master, **kwargs)
        self.var = StringVar() 
        self.val = [1,2,3,4,5,6,7,8,9]      
        self.config (font=('Calibri',9,'bold'), textvariable= self.var, values= self.val)
        self.var.trace_add ('write', self.change)
        
      
    def change(self, *args):
        spinbox = self.get()

        if spinbox == '':                                                          
            Frame_class .delete(1)  
        else:  
            pass

root = Tk()
root.geometry('250x130 100 100')   
app =  Frame_class (root)
app . pack()
root.mainloop()

When trying to delete the content of spinbox, this code throws me the following error: TypeError: delete() missing 1 required positional argument: 'number'

CodePudding user response：

You need to instantiate a class instance here. do this:

frame = Frame_class(root)
frame.delete(1)

full code:

from tkinter import *

class Frame_class(Frame):
    def __init__(self, parents, *args, **kwargs):
        Frame.__init__(self, parents, *args, kwargs)
        self.listbox = Listbox_class(self, width=11, height=1)
        self.listbox.pack() 

        self.spinbox = Spinbox_class(self, width=11)
        self.spinbox.pack()
        
        # from here I want to get the value of 
        # the first item of listbox or delete it     

    def delete(self, number):
        if number == 1:
            self.listbox.delete(0, END)
        if number == 2:
            self.listbox.delete(0, 1)


class Listbox_class(Listbox, Frame_class):

    def __init__(self, master, **kwargs):
        Listbox.__init__(self, master, **kwargs)       
        self.config(font=('Calibri',9,'bold'))
        self.insert(0, 'banana1')
        self.insert(0, 'orange1')



class Spinbox_class(Spinbox, Frame_class):

    def __init__(self, master, **kwargs):
        Spinbox.__init__(self, master, **kwargs)
        self.var = StringVar() 
        self.val = [1,2,3,4,5,6,7,8,9]      
        self.config (font=('Calibri',9,'bold'), textvariable= self.var, values= self.val)
        self.var.trace_add ('write', self.change)
        
      
    def change(self, *args):
        spinbox = self.get()

        if spinbox == '':   
            frame = Frame_class(root)
            frame.delete(1)  
        else:  
            pass

root = Tk()
root.geometry('250x130 100 100')   
app =  Frame_class(root)
app.pack()
root.mainloop()