pygame clock managed process accelerates and shouldn't - python-2.7

Question

I'm doing an RPG in pygame and just added portals to get from a map to another one. The problem is that when I get back to the first map, somehow movement and animation of my player character accelerate a lot. This acceleration is increased each time that I get back and forth.
Time is managed with a pygame clock object at 32 ticks per second:
time_passed = clock.tick(32)
self.worlds[self.currentWorld].process(time_passed)
general process method:
def process(self, time_passed):
tps = time_passed/1000.0
for entity in self.entities.itervalues():
entity.process(tps)
process method for an entity:
def process(self, tps):
if self.location != self.destination and self.animseq != None:
self.tps += tps
if self.tps > 0.25:
self.tps -= 0.25
self.image_to_render1 += 1
if self.image_to_render1 > self.animn:
self.image_to_render1 = 0
"teleport" method
def changeWorld(self, target):
self.currentWorld = target
self.worlds[self.currentWorld].addEntity(self.player)
self.player.world = self.worlds[self.currentWorld]
self.player.location.x = 200
self.player.location.y = 200
self.player.reset()
The reset is what I first tried to solve the problem, it resets the animations and player associated time, but it didn't change anything. I wonder if I just got something wrong with the clock or if I should recreate one on teleport. I hope someone can give me a clue, thanks in advance.

Answer 1

It's a simple logic error – you forget to remove your player from previous "world" when teleporting:
def changeWorld(self, target):
self.currentWorld = target
self.worlds[self.currentWorld].addEntity(self.player)
# Where's deleteEntity on the old world?
so when he comes back, there's two of the same player in the world.entities list. And then it gets processed twice, and moves twice faster.
This kind of error would be very easy to catch using basic debugging - if you would just put logging in your loop and in player.process methods, you would clearly see something like this in the output:
starting tick
processing player
processing player <--- There is two of them where should be only one!
starting tick
processing player
processing player
starting tick
processing player
processing player
Next time try to use debugging (it is harder in visual applications, but not impossible) or logging to make sure every entity in your state is exactly what you expect it to be at every step, and when you find discrepancy, it will be much easier to find a source of it. Good luck!