A snippet that enables Pygame Zero games to take screenshots during gameplay and save them to a 'screenshots' directory in the same path.

PGZScreenshots.py

from pygame import image as PGI
import time

def take_screenshot(Surface):
	outputDir = './screenshots/'
	if not os.path.exists(outputDir):
		os.makedirs(outputDir)
	PGI.save(Surface, outputDir + str( int(time.time()) ) + '.png' )

def on_key_down(key):
  if key == keys.P:
		take_screenshot(screen.surface)