Thuban/UI/main.py : import problem

[Didrik Pinte]

Hi,

I suppose some of you are on vacation. For my part, i'm back working on
Thuban for the next months.

When subclassing ThubanApplication in order to customize Thuban
(splashscreen etc.), I'm facing a little problem of imports

When launching my application, I got the following error :

did at geru-itae:~/Documents/ucl/alert/python$ python alert/main.py
Traceback (most recent call last):
  File "alert/main.py", line 9, in ?
    from alert.ui.application import AlertApplication
  File "/home/did/Documents/ucl/alert/python/alert/ui/application.py",
line 15, in ?
    from Thuban.UI import application
  File
"/home/did/projets/python/thuban/trunk/thuban/Thuban/UI/application.py",
line 37, in ?
    import mainwindow
  File
"/home/did/projets/python/thuban/trunk/thuban/Thuban/UI/mainwindow.py",
line 39, in ?
    import tableview, identifyview
  File
"/home/did/projets/python/thuban/trunk/thuban/Thuban/UI/identifyview.py", line 19, in ?
    import main
  File "/home/did/projets/python/thuban/trunk/thuban/Thuban/UI/main.py",
line 18, in ?
    from application import ThubanApplication
ImportError: cannot import name ThubanApplication


I don't understand where is the problem exactly. 

According to PEP-8, it is best to have only absolute imports. So i've
changed the Thuban/UI/main.py import to the following :

< from application           import ThubanApplication
> from Thuban.UI.application import ThubanApplication

but this crashes with the same error :

did at geru-itae:~/Documents/ucl/alert/python$ python alert/main.py
Traceback (most recent call last):
  File "alert/main.py", line 9, in ?
    from alert.ui.application import AlertApplication
  File "/home/did/Documents/ucl/alert/python/alert/ui/application.py",
line 15, in ?
    from Thuban.UI import application
  File
"/home/did/projets/python/thuban/trunk/thuban/Thuban/UI/application.py",
line 37, in ?
    import mainwindow
  File
"/home/did/projets/python/thuban/trunk/thuban/Thuban/UI/mainwindow.py",
line 39, in ?
    import tableview, identifyview
  File
"/home/did/projets/python/thuban/trunk/thuban/Thuban/UI/identifyview.py", line 19, in ?
    import main
  File "/home/did/projets/python/thuban/trunk/thuban/Thuban/UI/main.py",
line 18, in ?
    from Thuban.UI.application import ThubanApplication
ImportError: cannot import name ThubanApplication


Finallly, I got it to work by changing the imports and the code like
this :

< from application import ThubanApplication
> import application

<        app = ThubanApplication(0)
>        app = application.ThubanApplication(0)


So, two questions :

[1] Do someone know the why of the errors ?
[2] What is the best way to allow the subclassing of ThubanApplication ?
[3] What about PEP-8 and the fact that it does not work ?

Didrik
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