Never mind I solved the problem! For all of you with the same problem: it appears that the first time that you use or import (i'm not really sure) a class in the python shell, it's source-code file is compiled automatically in a ".pyc" file, in the same directory where the source-code file is located and with the same name. After that everytime you import that class, the python interpreter gets it from the ".pyc" file. You added the "was_published_today()" method to the Poll class in the "models.py" file, but the "models.pyc" file still contains the old version even after an re-import or reuse of the Poll class. It seems that Python compiles the module only the first time it is imported, and after that even if the source-code in "models.py" changes, the python interpreter doesn't automatically recompile the new version of the code. That's why the ".pyc" file still has the old version of the Poll class and that's where the Python interpreter imports the class from so you get the Traceback (most recent call last): File "<console>", line 1, in <module> AttributeError: 'Poll' object has no attribute 'was_published_today' error in the interpreter. I think that it has nothing to do with indentation or whitespaces. If you delete the ".pyc" files for every file you change, then there should be no more problems. Just go to polls/ directory and delete "models.pyc" (or any other ".pyc" file if you had made changes to "settings.py" or "urls.py"). Everything should work fine now.
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