ciroip,

!!! impressive, but it doesn't work by default

Your code is looking for d1.png and d2.png in the clock function:

def clock(cfr1,cfr2,cfr3,cfr4):
# sep1=pygame.image.load("d1.png")
# sep2=pygame.image.load("d2.png")

commenting these out gets it running

Package it up and make it available for everyone.
Simple little usable apps are great to have.