python, instance of object in another file

Question

This maybe a dumb question, but I'm gonna ask it anyways. I have a creature file and a simulation file, each contain a class of the same name. In the Simulation class's init, I need to initialize two Creature object. I have imported the creature file, but when I try creature.Creature() I get

Traceback (most recent call last): File "/Users/lego90511/Documents/workspace/creatureSim/simulation.py", line 2, in <module> import creature File "/Users/lego90511/Documents/workspace/creatureSim/creature.py", line 3, in <module> import simulation File "/Users/lego90511/Documents/workspace/creatureSim/simulation.py", line 86, in <module> sim = Simulation(5) File "/Users/lego90511/Documents/workspace/creatureSim/simulation.py", line 6, in __init__ self.creatures = {creature.Creature(4, 4, 3, 4, 4, 3, 10):"", creature.Creature(4, 4, 3, 4, 4, 3, 10):"", } AttributeError: 'module' object has no attribute 'Creature'"

What am I doing wrong?

Here is the relevant code:

Simulation:

import creature from random import randint class Simulation(): def __init__(self, x): self.creatures = {creature.Creature():"", creature.Creature():"", } ...

Creature:

class Creature: def __init__(self, social, intelligence, sensory, speed, bravery, strength, size): self.traits = [social, intelligence, sensory, speed, bravery, strength] ...

Running your code on my PC leads to no such error but you should give enough arguments to Creature. — zhangyangyu
– zhangyangyu, Commented Mar 24, 2013 at 18:10
I've added the full error text incase that reveals anything thing more. Could it have something to deal with using python 3.3 — EasilyBaffled
– EasilyBaffled, Commented Mar 24, 2013 at 18:35

Daniel Roseman · Accepted Answer · 2013-03-24 18:43:07Z

You have a circular dependency. creature is importing simulation, which in turn is trying to import creature, so it fails. You'll need to structure your files a different way to remove the circularity - either put both classes in one file, or move one import inside a function.

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