Write a program in Python to find the RREF(Reduced Row Echelon Form) of a matrix.

The program should accept as input the size of the matrix, i.e., the number of rows and the number of columns of A, and also the entries of A.

don't use any pre-existing routines from Python libraries .

please also explain how the code works as I have spent 4 hours and still couldn't make it work. please don't use too complex python for the code.

Also Please don't use this code

[ lead = 0

for r in range(m):

if lead >= n:

return

i = r

while matrix[i][lead] == 0:

i += 1

if i == m:

i = r

lead += 1

if n == lead:

return

matrix[i], matrix[r] = matrix[r], matrix[i]

lv = matrix[r][lead]

matrix[r] = [mrx / float(lv) for mrx in matrix[r]]

for i in range(m):

if i != r:

lv = matrix[i][lead]

matrix[i] = [iv - lv * rv for rv, iv in zip(matrix[r], matrix[i])]

lead += 1]

Thanks