Question about circular imports
frank at chagford.com
Sun Feb 26 06:18:20 EST 2012
"Frank Millman" <frank at chagford.com> wrote in message
news:jid2a9$n21$1 at dough.gmane.org...
> Hi all
> I seem to have a recurring battle with circular imports, and I am trying
> to nail it once and for all.
> The second solution is -
> in formats/__init__.py
> import sys
> sys.path.insert(0, __path__)
> in wavread.py -
> import wavwrite
> in wavwrite.py -
> import wavread
> This works, but I don't know if it is a good idea to add all the
> sub-package paths to sys.path. I realise that it is up to me to avoid any
> name clashes. Are there any other downsides?
Answering my own question, I have just found a downside that is a
If a module in a different sub-package needs to import one of these modules,
it must use a full path. This results in a new entry in sys.modules, and
therefore any attributes referenced by the intra-package module have
different identities from those referenced from outside. If they are static,
there is no problem, but if not, disaster strikes!
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