How to calculate fps from elapsed time?

p/s: copy from https://stackoverflow.com/questions/43761004/fps-how-to-divide-count-by-time-function-to-determine-fps

• Here is a very simple way to print your program's frame rate at each frame (no counter needed) :
  

  import time
  
  while True:
      start_time = time.time() # start time of the loop
  
      ########################
      # your fancy code here #
      ########################
  
      print("FPS: ", 1.0 / (time.time() - start_time)) # FPS = 1 / time to process loop

• If you want the average frame rate over x seconds, you can do like so (counter needed) :
  

  import time
  
  start_time = time.time()
  x = 1 # displays the frame rate every 1 second
  counter = 0
  while True:
  
      ########################
      # your fancy code here #
      ########################
  
      counter+=1
      if (time.time() - start_time) > x :
          print("FPS: ", counter / (time.time() - start_time))
          counter = 0
          start_time = time.time()

Hope it helps!