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

[Drew Vogel]

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?

Drew Vogel