On Sunday, December 09, 2012 11:48:18 PM Shriramana Sharma wrote:
> Hi -- recently I was trying to shorten the following overly verbose
> (IMO) lines to:
>
> self . p1xSpin = QSpinBox ()
> self . p1ySpin = QSpinBox ()
> self . c1xSpin = QSpinBox ()
> self . c1ySpin = QSpinBox ()
> self . c2xSpin = QSpinBox ()
> self . c2ySpin = QSpinBox ()
> self . p2xSpin = QSpinBox ()
> self . p2ySpin = QSpinBox ()
>
> to:
>
> self . p1xSpin, self . p1ySpin, self . c1xSpin, self . c1ySpin,
> self . c2xSpin, self . c2ySpin, self . p2xSpin, self . p2ySpin,
> self . pHxSpin, self . pHySpin = ( QSpinBox () for i in range (
> 10 )
)
>
> but I got the error:
>
> Traceback (most recent call last):
> File "./bezierview-cubic-interp.py", line 327, in <module>
> mainWindow = MainWindow ()
> File "./bezierview-cubic-interp.py", line 204, in __init__
> self . p1xSpin, self . p1ySpin, self . c1xSpin, self . c1ySpin,
> AttributeError: 'MainWindow' object has no attribute 'p1xSpin'
>
Probably some simple error here causing the line to try to get the attribute
instead of set it.
>>> class Y(object):
>>>
>>>
>>>
... def __init__(self):
... self.a, self.b = (QSpinBox() for a in range(2))
...
>>>
>>>
>>>
>>>
>>> y = Y()
>>>
>>>
>>>
> Why is this, and is there any other method I can follow to shorten the
> tortuous list of repetitive commands for initializing multiple
> widgets?
>
If you have a bunch of similarly named attributes then you can easily generate
them.
>>> class X(object):
... def __init__(self):
... for at in ['%s%s%s' % (a,b,c) for a in ('c','p') for b in
('x','y') for c in (1,2)]:
... setattr(self,at,QSpinBox())
...
>>> x = X()
>>> x.cx1
<PyQt4.QtGui.QSpinBox object at 0x27c8440>
>>> x.cx2
<PyQt4.QtGui.QSpinBox object at 0x27c84d0>
Matt
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