Cyclic "import xyz as abc"

Question

I have a problem when I try to have a cyclic import in Python 3. I am writing a PyQt4 app and I want to make some object available in the whole app. This way I end up having some files:

index.py

import source.blab as bl

source/blab.py

import source.windows
windows = source.windows.Windows()

source/windows.py

import source.window_clients.main_window

class Windows:
    ...

source/window_clients/main_window.py

import source.blab

class MainWindow(QWidget):
    ...

So far, the code works. However, for aesthetic reasons, I would like to change the import command in main_window.py into:

import source.blab as bl

which throws an:

AttributeError: module 'source' has no attribute 'blab'

I am sure, this is related to Circular (or cyclic) imports in Python where they say that one cannot use from a * import b in a cyclic import. Is it the same for import a as b? If so, is there another way to change the name of the imported module?

Answer 1

It seems that this is a known bug that has been fixed now. The reasons have to do with how the import statement was implemented in the different cases.