<human>:  greatest common divisor function in.
<bot>: Here is a Python code to the greatest common divisor

import math

def gcd(a, b):
  """
  What's a python function for greatest common divisor function in
  """
  return a % b

# Enter the numbers
a = 10
b = 5

# Calling the function
print((gcd(a, b)))

#Example Output
# 0

#Remember to inspect code for bugs.