On Mon, Sep 15, 2008 at 07:14:04AM -0700, SimonPalmer wrote: > what is the overhead associated with importing a new module (whichever > includes izip)?
Modules are cached, so the cost of importing a module, when it has already been loaded, is simply the cost of checking if it has been loaded, and copying the references to the variables in the locals namespace. Changes are izip has already been loaded, so the overhead is going to be relly low. Don't put the import statement in the inner loop, so as not to have this overhead while running the loop. Put it at the module level, so as to have it only once. By the way, speed question are not something one should consider from prior knowledge, at least not too much, because it is so easy to get it wrong. Just use the "%timeit" magic of IPython to check for yourself, and when you have different approaches in mind, see which one is the fastest. HTH, Gaël _______________________________________________ Numpy-discussion mailing list [email protected] http://projects.scipy.org/mailman/listinfo/numpy-discussion
