from PyQt4 import QtGui

class Deck(QtGui.QWidget):

    def __init__(self, filename, parent):
        super(Deck, self).__init__(parent)

        self.setMinimumSize(100, 150)
        self.setStyleSheet('background-color: yellow;')

        label = QtGui.QLabel("deck", self)
        label.show()

app = QtGui.QApplication([])
main = Deck(None, None)
main.show()
app.exec_()