wrong in ',' and '.' pressed

[Lei Chen]

 if pressed[pygame.K_COMMA]:
      self.frame -= 1
      if self.frame >= len(self.motions):
        self.frame = 0
 if pressed[pygame.K_PERIOD]:
      self.frame += 1
      if self.frame < 0:
        self.frame = len(self.motions) - 1

should be

 if pressed[pygame.K_COMMA]:
     self.frame -= 1
     if self.frame < 0:
        self.frame = len(self.motions) - 1
 if pressed[pygame.K_PERIOD]:
      self.frame += 1
      if self.frame >= len(self.motions):
        self.frame = 0

[Yuxiao Zhou]

Fixed. Thanks!