How do I create an arbitrary amount of Entry boxes in tkinter?

Question

I am creating an app to handle all sorts of matrix math and I'm currently in the process of making the input for any nxn matrix into a grid of entry boxes. My current function makes the grid I am looking for but it's the same entry box over and over. I was wondering if there is any way to make them all unique(something like entry_0_0 , entry_n_n) when laying out an arbitrary amount of entries.

from numpy import *
from tkinter import *


master = Tk()
master.title('Matrix')
num = StringVar()

def createGrid(r, c):

    for i in range(r):
        for j in range(c):
            entry = Entry(master, textvariable=num, width=2)
            entry.grid(row=i, column=j)
            j += 1
        i += 1

r = int(input('Enter Square Matrix Size: '))
c = r

createGrid(r, c)

Answer 1

but it's the same entry box over and over

No, it isn't. Your entry boxes are unique but they all point to the same StringVar text variable and so will all show the same value. Rather than a single StringVar you need a matrix of them, that matches your matrix of entries:

from tkinter import *

master = Tk()

def createGrid(rows, columns):

    textMatrix = []

    for r in range(rows):
        textRow = []

        for c in range(columns):
            variable = StringVar()

            entry = Entry(master, textvariable=variable, width=2)
            entry.grid(row=r, column=c)

            textRow.append(variable)

        textMatrix.append(textRow)

    return textMatrix

columns = rows = int(input('Enter Square Matrix Size: '))

num = StringVar()

text_matrix = createGrid(rows, columns)

# Test that we can set all the matrix entries independently

for r in range(rows):
    for c in range(columns):
        text_matrix[r][c].set(r * columns + c)

master.mainloop()