Print matrix in spiral

program.py

a = [[1, 2, 3, 4, 5, 6],
     [7, 8, 9, 10, 11, 12],
     [13, 14, 15, 16, 17, 18]]

int_row = 0
last_row = 3
int_col = 0
last_col = 6

while(int_row<=last_row and int_col<=last_col):

    for i in range(int_col,last_col):
        print(a[int_row][i],end=' ')
    int_row+=1

    for j in range(int_row,last_row):
        print(a[j][last_col-1],end=' ')
    last_col-=1

    if(int_row<=last_row):
        for i in range(last_col-1,-1,-1):
            print(a[last_row-1][i],end=' ')
        last_row-=1

    if(int_col<=last_col):
        for j in range(last_row-1,0,-1):
            print(a[j][int_col],end=' ')
        int_col+=1