Making sure length of matrix row is all the same (python3)

Question

so I have this python 3 code to input a matrix:

matrix = []
lop=True
while lop:
    line = input()
    if not line:
        lop=False
    if matrix != []:
               


        

Answer 1

If you want match the first row length, Try this way,

Use len(matrix[0])

for row in matrix:
    if len(row) == len(matrix[0]):
        pass
    else:
       print('not same lenght')