def is_prime1_timing ( n ):

  from is_prime1 import is_prime1
  from time import perf_counter

  tic = perf_counter ( )      # Start the clock.

  is_prime = is_prime1 ( n )

  toc = perf_counter ( )     # Stop the clock.

  print ( 'is_prime1(): is ', n, ' prime? ', is_prime )
  print ( '  Computing seconds was ', toc - tic )