code: def gen_fibonacci():
          
          num_a, num_b = 1, 2
          while True:
              yield num_a
              num_a, num_b = num_b, num_a + num_b
docs: Yield the next Fibonacci number.
  
          Based on https://www.python-course.eu/generators.php
          Starts at Fibonacci number 3 (the second 1)
  
          Yields
          ------
          int
              The next Fibonacci number