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Re: [Pulp-list] Fwd: [katello-devel] Python import advice

On 07/29/2011 01:24 AM, Lukas Zapletal wrote:
On 07/28/2011 05:10 PM, Jeff Ortel wrote:
circular import issue.

Yes, moved to the method and its gone :-)

Be careful with doing imports inside functions or methods in library code - it can cause deadlocks if an application spawns threads as a side effect of import that then call those operations (see the first bullet point in http://docs.python.org/library/threading#importing-in-threaded-code)

Moving components around to eliminate the circular dependency is a preferable solution (e.g. just looking at the traceback, moving the definition of KatelloError out of the cli subpackage to an approporiate location in the core subpackage and providing an alias in the old location may be a more robust long term solution than just delaying the import).


Nick Coghlan
Red Hat Engineering Operations, Brisbane

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