Using:Python 2.7.0+ (r27:82500, Sep 15 2010, 18:14:55) [GCC 4.4.5] on linux2(Ubuntu 10.10) Method to reproduce error: 1. Defining a module which is later imported by another: --------------------------------------------------------------------- class SomeThing: def __init__(self): self.variable = 'Where is my bytecode?' def deliver(self): return self.variable

if __name__ == '__main__': obj = SomeThing() print obj.deliver() --------------------------------------------------------------------- 2. Run this module:Output of the Python Shell: Where is my bytecode? >>> 3. Defining the importing module: --------------------------------------------------------------------- class UseSomeThing: def __init__(self, something): self.anything = something def giveanything(self): return self.anything

if __name__ == '__main__': anything = UseSomeThing(SomeThing.SomeThing().deliver()).giveanything() print anything --------------------------------------------------------------------- 4. Run this module:Output of the Python Shell: Where is my bytecode >>>(One can find SomeThing.pyc on the disc.) 5. Changing the imported module: ---------------------------------------------------------------------class SomeThing: def __init__(self): self.variable = 'What the hell is this? It could not be Python!' def deliver(self): return self.variableif __name__ == '__main__': obj = SomeThing() print obj.deliver()--------------------------------------------------------------------- 6. Run the changed module:Output of the Python Shell: What the hell is this? It could not be Python! >>> 7. Run the importing module again:Output of the Python Shell: Where is my bytecode? >>>8. Deleting the bytecode of the imported module makes no effect! Remark: I think that I have observed yesterday late night a similar effect on Windows XPwith Python 2.7.1 and Python 3.1.3. But when I have tried it out today in the morning theerror hasn't appeared. So it may be that the Python interpreter isn't working correctly onlyon Ubuntu 10.10.