[PyQt] Using self.tr() with python string formatting

[Itay Brandes]

right now for using self.tr() with python string formatting, i do the
following thing:

unicode(self.tr("%d out of %d completed")) % (i, n)

is there a way to somehow combine the unicode & self.tr, or make them look
shorter?
because calling unicode(self.tr()) on every shown string makes a lot of
code noise

Thanks.
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