[PyQt] QVariant TypeError on python class, but not on Qt class

[Phil Thompson]

On Wednesday 04 April 2007 3:01 am, Drew Vogel wrote:
> Consider this listing:
>
>    1.
>       from PyQt4 import QtCore
>    2.
>       from PyQt4 import QtGui
>    3.
>
>    4.
>
>    5.
>       # This works
>    6.
>       i = QtGui.QIcon()
>    7.
>       qi = QtCore.QVariant(i)
>    8.
>
>    9.
>
>   10.
>       # This throws TypeError: argument 1 of QVariant() has invalid type
>   11.
>       class C:
>   12.
>               def __init__(self, v):
>   13.
>                       self.value = v
>   14.
>
>   15.
>       x = C(100)
>   16.
>       qx = QtCore.QVariant(x)
>
>
> Why does line 16 throw TypeError, but line 7 does not? I suspect that it
> has something to do with "x" being a python class and "i" being a Qt
> class, but I don't see anything in the QVariant documentation mentioning
> a difference. Is this supposed to be supported?

QVariant can only handle types it knows about (nothing to do with whether they 
are Qt classes). It knows nothing about C.

Phil