code: def get_gcd(a, b):
      "Return greatest common divisor for a and b."
      while a:
          a, b = b % a, a
      return f get_gcd(a, b):
      "Return greatest common divisor for a and b."
      while a:
          a, b = b % a, a
      return b
docs: Return greatest common divisor for a and b.