Terry Reedy wrote:
Hans Mulder wrote:Errrhm, no. He is not deleting the PyQt4 module from sys.modules; he's only deleting the name QtGui from his own namespace. Next time Python comes across from PyQt4 import QtGui , it finds that the module PyQt4 already exists in sys.modules, so Python does not have to load the module again. All it has to do is bind name QtGui in the importing module to the class with the same name in the PyQt4 module. That does not take many cycles.I recently discovered that when IDLE restarts (as when one runs a file from an edit window), it clears the global namespace but does not clear sys.modules. Hence re-running a script that does time-consuming imports is much faster, as only the global name binding is done after the first run.
Whoops, on rechecking, above does not seem to be true. The faster rerun time I was seeing was due to some other cause. Sorry for the noise.
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