variable assignment - Python printing none -

so have assignment completed there's 1 last step print says none. here's code

#copy definition of function print_chars below def print_chars(multiples, char):     print_chars= multiples* char     print (print_chars)  #copy definition of function sum_arithmetic_seq below def sum_arithmetic_seq(n):     return n* (n+1)//2   #copy definition of function factorial below import math def factorial(n):     return math.factorial(n)  #here's program n in range(1,7,1):     print(n)     print('sum:', print_chars(sum_arithmetic_seq(n) ,'*'))     print('factorial:', print_chars(factorial(n),'#')) 

the output end (i'm going put part of because it's long.)

1 * sum: none # factorial: none  how it's supposed be: 1 sum: * factorial: # 

print_chars doesn't return anything. make return printing can use it's output. in last print, can't utilize value because there nothing there. change print return fix it.