Newbee in coding, help pls...

[Hloppka]

Hi, i'm newbee in coding and my teacher gave me the task to create two matrices, type = m*n, the code has to summarize, subtract and transpose. I have a bit of code, but idk what to do next.
The code:
from tkinter import *
from tkinter import messagebox

def create_matrices():
try:
n = int(entry_rows.get())
m = int(entry_cols.get())

    # Create matrices filled with zeros
    global matrix1, matrix2, matrix3
    matrix1 = [[0 for _ in range(m)] for _ in range(n)]
    matrix2 = [[0 for _ in range(m)] for _ in range(n)]
    matrix3 = [[0 for _ in range(m)] for _ in range(n)]
    
    messagebox.showinfo("Success", f"Matrices {n}x{m} created!")
except ValueError:
    messagebox.showerror("Error", "Please enter whole numbers for rows and columns!")

def plus():
for i in range(len(matrix1)):
for j in range(len(matrix1[0])):
matrix3[i][j] = matrix1[i][j] + matrix2[i][j]
show_result("Sum of matrices:", matrix3)

def minus():
for i in range(len(matrix1)):
for j in range(len(matrix1[0])):
matrix3[i][j] = matrix1[i][j] - matrix2[i][j]
show_result("Difference of matrices:", matrix3)

def trans():
transposed = [[matrix1[j][i] for j in range(len(matrix1))] for i in range(len(matrix1[0]))]
show_result("Transposed matrix1:", transposed)

def show_result(title, matrix):
result_window = Toplevel()
result_window.title(title)

for i, row in enumerate(matrix):
    for j, val in enumerate(row):
        Label(result_window, text=str(val), width=5, borderwidth=1, relief="solid").grid(row=i, column=j)

Main window

root = Tk()
root.title('Matrix Operations')

Input for number of rows and columns

Label(root, text="Number of rows (n):").grid(row=0, column=0)
entry_rows = Entry(root)
entry_rows.grid(row=0, column=1)

Label(root, text="Number of columns (m):").grid(row=1, column=0)
entry_cols = Entry(root)
entry_cols.grid(row=1, column=1)

Button to create matrices

Button(root, text="Create Matrices", command=create_matrices).grid(row=2, columnspan=2)

Operation buttons

Button(root, text="Add", command=plus).grid(row=3, column=0)
Button(root, text="Subtract", command=minus).grid(row=3, column=1)
Button(root, text="Transpose matrix1", command=trans).grid(row=4, columnspan=2)

Start the GUI loop

root.mainloop()