please dont forget to return none . thank you

use python please

Do Exercise 15.3 on page 523 Have your program include the following: Begin the program and each function with a comment. Local variables, rather than global Structured code (e-g. no unstructured exits from loops, breaks or retuns) Have the gcd function return this value. The % operator crashes the programi if the 2nd operand is 0. If m and n are 0 return NONE and print an error message. Have the main function include test calls with the following six values: . . mn 12 13 17 0 0 TO 0 Turn in copies of your program listing and output. Please staple this assignment sheet to your printouts