Program debugging (python)

[abdullahali]

Hello, I am trying to create a program that asks user for sequence of 9 numbers and then verifies if they . make a magic square or not. Magic square requirments: rows, coumns and diagonal all sum up to 15 each, and no number is repeated. When I run and enter [1, 2, 3, 4, 5, 6, 7, 8, 9] I get an error code.

N = 3


# Returns true if mat[][] is magic
# square, else returns false.
def is_magic(square):
    # calculate the sum of
    # the prime diagonal
    sum = 0
    for i in range(0, N):
        sum= sum + square[i][i]

        # For sums of Rows
    for i in range(0, N):
        rowsum = 0
        for j in range(0, N):
            rowsum += square[i][j]

            # check if every row sum is
        # equal to prime diagonal sum
        if (rowsum != sum):
            return False

    # For sums of Columns
    for i in range(0, N):
        columnsum = 0
        for j in range(0, N):
            columnsum += square[j][i]

            # check if every column sum is
        # equal to prime diagonal sum
        if sum != columnsum:
            return False

    return True


str_input = input("write a squence of nine numbers")
str_list = str_input.split()



square = []
for i in range(0, N):
    square.append([])
    for j in range(0, N):
        square[i].append(str(str_list[j + i * N]))

if is_magic(str_list):
    print("This is Magic Square")
else:
    print("This is Not a magic Square")

Error:
  File "/Users/abdullahali/Desktop/a1-q1.py", line 47, in <module>
    square[i].append(str(str_list[j + i * N]))
IndexError: list index out of range