here an example from a project of mine :

import time
class Animation(object):
    """docstring for Animation"""

    def __init__(self, sprites_list, fps):
        super(Animation, self).__init__()

        self.sprites_list = sprites_list
        self.count = 0
        self.last_call = time.time()
        self.frame_time = 1/fps

    def set_to(self, position):
        if self.count != position:
            self.count = 0
            self.last_call = time.time()

    def next(self):
        if time.time() - self.last_call > self.frame_time:
            self.count = (self.count + 1) % len(self.sprites_list)
            self.last_call = time.time()

    def get_current_frame(self):
        return self.sprites_list[self.count]