On Tue, Jan 15, 2013 at 1:54 AM, zoom <z...@yahoo.com> wrote: > Is there any "rules" regarding importing python modules within your own > module? I mean, how does this affects the performance of the program? > > In short, when creating a module, is it worthwhile to be careful and import > only necessary functions, nothing more?
Nope. When you import a module, a record of it is kept in sys.modules, so the next time you import it, it's just picking up the same module object. > scipy.r_[a] = sound.scipy.r_[a] They'll actually be the same thing, which you can test with the 'is' operator. The performance cost of reimporting a module is very low; in fact, trying to avoid it by adorning all your usage with an extra dot-level will probably cost you a lot more, since there'll be an extra lookup every time. Have at it! :) ChrisA -- http://mail.python.org/mailman/listinfo/python-list
