[PyQt] Attempting to reduce the memory footprint of my PyQt5 application

[Florian Bruhin]

* David Boddie <david at boddie.org.uk> [2016-09-07 01:03:30 +0200]:
> On Tue Sep 6 05:22:29 BST 2016, Xavion wrote:
> 
> > I'm trying to cut down on the memory usage of my PyQt5 application.  I'm
> > assuming that one way to do this is to only import the Qt submodules that
> > are actually used.
> > 
> > The three attached files illustrate my point.  The Qt5 Designer only
> > imports the necessary submodules (e.g. "QtCore/QVariant").  Whereas, the
> > PyQt5 UIC and RCC generators import the parent modules in full (e.g.
> > "QtCore").
> 
> In PyQt, unless I'm mistaken, you get the whole module when you import a
> class from it so there's no way to just import the classes you use. There
> may be some tricks done to save memory at run-time but you will already be
> benefiting from those.

Correct - not only in PyQt, but in Python in general. Basically,
"from foo import bar" is equivalent to:

    import foo
    bar = foo.bar
    del foo

Florian

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