On 24 févr. 2014, at 21:52, anubhav joshi <[email protected]> wrote:

> 2.) There it says: "Import errors discovered during application loading 
> during can be masked under certain circumstances."
> If I could get a better explanation of this, it would be very helpful.
> 
> Also If I could get an answer to the above.

Overall, this happens when Django catches an exception and re-raises another 
exception, usually ImproperlyConfigured, in order to provide a "more helpful" 
error message. This gets nasty when the original exception is already hard to 
diagnose with the full context, for instance when it's an ImportError triggered 
by a circular import. It's also quite bad when another part of Django catches 
ImproperlyConfigured again. I've seen that, but I cannot remember where.

There's a particularly vicious variant of the circular import problem: when 
it's triggered by a reentrant call to the app cache population process. 
Attempts to remove the faulty circular import may change the import sequence 
and create another circular imports, making for a particularly annoying 
whack-a-mole game. This is fixed in 1.7. Have a look at my posts discussing 
circular imports in the context of app-loading in December and early January 
for details.

-- 
Aymeric.

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