tk.call( _tkinter.TclError: unknown option "-bg"

Question

I want to set a theme to my tkinter window as well as config my tkinter window buttons, labels with options like bg. Following is my approach,

Imports,

from tkinter import * 
import tkinter as tk
from tkinter import ttk
from ttkthemes import ThemedTk

Code w/o setting the theme:

root = Tk()
root.geometry('500x500')

rootlabel1 = Label(root, text="Total Income : ", bg = "red")  
rootlabel1.grid(row=1, column = 0)
rootlabel1.configure(anchor="center")

btn1 = Button(root, text = 'Add Income', pady = 20)
btn1.grid(row = 2, column = 1)

rootlabel = Label(root, text="Total Income : ")  
rootlabel.grid(row=4, column = 0)
rootlabel.configure(anchor="center")
root.mainloop()

Above was successful but did not had theme set.

Code after setting the theme:

root = ThemedTk(theme = "xpnative", themebg = True)
root.geometry('500x500')

rootlabel1 = ttk.Label(root, text="Total Income : ", bg = "red")  
rootlabel1.grid(row=1, column = 0)
rootlabel1.configure(anchor="center")

btn1 = ttk.Button(root, text = 'Add Income', pady = 20)
btn1.grid(row = 2, column = 1)

rootlabel = ttk.Label(root, text="Total Income : ")  
rootlabel.grid(row=4, column = 0)
rootlabel.configure(anchor="center")
root.mainloop()

I am getting the following error,

    Traceback (most recent call last):
  File "c:/Users/admin/Desktop/Stackoverflow/hskjf.py", line 11, in <module>
    rootlabel1 = ttk.Label(root, text="Total Income : ", bg = "red")
  File "C:\Users\admin\AppData\Local\Programs\Python\Python38-32\lib\tkinter\ttk.py", line 759, in __init__
    Widget.__init__(self, master, "ttk::label", kw)
  File "C:\Users\admin\AppData\Local\Programs\Python\Python38-32\lib\tkinter\ttk.py", line 557, in __init__
    tkinter.Widget.__init__(self, master, widgetname, kw=kw)
  File "C:\Users\admin\AppData\Local\Programs\Python\Python38-32\lib\tkinter\__init__.py", line 2567, in __init__
    self.tk.call(
_tkinter.TclError: unknown option "-bg"

As soon as I add prefix ttk. to my buttons or labels eg. - btn1 = ttk.Button(root, text = 'Add Income', bg = "red")
I am unable to use bg for these buttons/labels.

My Attempts,

1.   btn1 = ttk.Button(root, text = 'Add Income', bg = "red")

2.   rootlabel1 = ttk.Label(root, text="Total Income : ")  
       rootlabel1.grid(row=1, column = 0)
       rootlabel1.configure(anchor="center", bg = "red")

I am unable resolve the error, what I can do to fix it? so that I get both themes as well as options in my button/label.

(Previously, I wasnt able to use padx, pady but according to suggestion given in comment it worked well.)

Answer 1

Most of the config of grid layout manager is here.(Also,padx or pady is to set the padding.For sure it should be put in layout manager.)

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Also,there are some differences between tk widget and ttk widget.In tk widget,you could use bg to set the background directly.But In ttk widget,you need to custom a ttk.Style()

In tk widget:

l1 = tkinter.Label(text="Test", bg="white")

But in ttk widget,you need to:

style = ttk.Style()
style.configure("BW.TLabel", background="white")

l1 = ttk.Label(text="Test", style="BW.TLabel")

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Refer it in: ttk-Styling