python - List index out of range for random cayley table -

i'm trying write code produce random cayley table getting list index out of range error, can't work out why.

here code:

def randcaytab(n):     if not n >= 0:         return false     table = []     in range(n):         table.append([])         j in range(n):             k in range(n):                 (table[j]).append(randint(0,(n-1)))     return table 

i error on line:

(table[j]).append(randint(0,(n-1))) 

any appreciated.

table[i].append(randint(0,n-1)) 

(the parenthesis didn't harm diminish readibility)