A comparison of the behavior of two ways of calculating button grid positions, given one fewer button than expected

1d_list_and_arithmetic.py

#create a grid of buttons using a 1d list of texts, and arithmetic to convert between 2d position and 1d index

from tkinter import *

root = Tk()
root['bg'] = '#1e2936'
texts = [
    'DEL', 'C', '^2', 'v',
    '1', '2', '3', '+',
    '4', '5', '6',            #minus button intentionally omitted
    '7', '8', '9', 'x',
    '.', '0', '=', '/'
]

Label(root,text='6*9+6+9',fg='white',font=('',34,'bold'),bg='#1e2936',anchor='e').grid(row=0,column=0,columnspan=4,sticky='news',pady=10)

btns = []
img = PhotoImage(width=1,height=1)
for text in texts:
    if text in '1234567890': color = "#10B981"
    elif text in ('+', '-', 'x', '/', 'v', '^2'): color = "#F59E0B"
    elif text in "=": color = "#047857"
    elif text in ("C", "DEL"): color = "#2563EB"
    btn = Button(root,text=text,bg=color,fg='white',image=img,compound='t',width=100,height=100,relief='flat',highlightcolor='red',font=('',18,'bold'))
    btns.append(btn)

for i in range(5):
    for j in range(4):
        if 4*i+j < len(btns):
            btns[4*i+j].grid(row=i+1,column=j,padx=5,pady=5)

root.mainloop()

2d_list_and_enumerate.py

#create a grid of buttons using a 2d list of texts, with the 2d index corresponding to the final grid position

from tkinter import *

root = Tk()
root['bg'] = '#1e2936'
texts = [
    ['DEL', 'C', '^2', 'v'],
    ['1', '2', '3', '+'],
    ['4', '5', '6'],                        #minus button intentionally omitted
    ['7', '8', '9', 'x'],
    ['.', '0', '=', '/']
]

Label(root,text='6*9+6+9',fg='white',font=('',34,'bold'),bg='#1e2936',anchor='e').grid(row=0,column=0,columnspan=4,sticky='news',pady=10)

btns = []
img = PhotoImage(width=1,height=1)
for j, row in enumerate(texts):
    for i, text in enumerate(row):
        if text in '1234567890': color = "#10B981"
        elif text in ('+', '-', 'x', '/', 'v', '^2'): color = "#F59E0B"
        elif text in "=": color = "#047857"
        elif text in ("C", "DEL"): color = "#2563EB"
        btn = Button(root,text=text,bg=color,fg='white',image=img,compound='t',width=100,height=100,relief='flat',highlightcolor='red',font=('',18,'bold'))
        btn.grid(row=j+1, column=i, padx=5, pady=5)
        btns.append(btn)

root.mainloop()