How to correctly create a second window in pyqt4 - python-2.7

Question

I'm trying to open a second window beside my mainwindow on a button click and display a tablewidget on it with some data. When I open the window it raises
AttributeError: 'Ui_MainWindow' object has no attribute 'openTable'
The mainwindow was created with Qt Designer and converted the ui file with pyuic4. How do I do this correctly correct so that the error is not raised?
The button calls function:
def showCliplist(self):
data = self.metadata_list
luts = self.lutlist
selected_lut = self.LUTBox.currentIndex()
openTable = ClipListViewer(data,luts,selected_lut)
self.openTable.show()
New window class:
class ClipListViewer(QtGui.QWidget):
def __init__(self, data, luts, selected_lut, parent = None):
super(ClipListViewer,self).__init__()
self.setWindowTitle('Cliplist')
self.resize(900,600)
self.metadata = data
self.curentluts = luts
self.choosenlut = selected_lut
y_count = len(self.metadata)
self.table = QtGui.QTableWidget(y_count,6)
self.table.setHorizontalHeaderLabels(['Clip', 'Videocodec', 'FPS', 'Audiocodec', 'Start Timecode', 'LUT'])
x = y = 0
for items in self.metadata:
for entry in items:
#print entry
self.table.setItem(y, x, QtGui.QTableWidgetItem(entry))
self.table.resizeColumnToContents(x)
x += 1
self.comb = QtGui.QComboBox()
for lutname in self.curentluts:
self.comb.addItem(lutname)
self.comb.setCurrentIndex(self.choosenlut)
self.table.setCellWidget(y, 5, self.comb)
self.table.setColumnWidth(5, 230)
y += 1
x = 0
self.table.resizeRowsToContents()
layout = QtGui.QHBoxLayout()
layout.addWidget(self.table)
self.setLayout(layout)
self.show()
def closeEvent(self, event): #check if window was closed
print "Cliplist Window was closed! "

Answer 1

I reviews your code completed, OK, let's me explain.
AttributeError: 'Ui_MainWindow' object has no attribute 'openTable'
This error says, "I not have self.openTable in class Ui_MainWindow (That true because your have create own method)".
Why ? : Because a problem is in line this;
def showCliplist(self):
data = self.metadata_list
luts = self.lutlist
selected_lut = self.LUTBox.currentIndex()
openTable = ClipListViewer(data,luts,selected_lut) # <- (1) THIS LINE
self.openTable.show() # <- (2) THIS LINE
In (1), your create your second widget in to openTable (Not self.openTable).
This line we have this object in openTable (Not self.openTable).
Then (2), your call QtGui.QWidget.show(self) to show widget of self.openTable (Not openTable). It's should be error because we don't have variable self.openTable. To fix it your should use same name variable, Like this;
def showCliplist(self):
data = self.metadata_list
luts = self.lutlist
selected_lut = self.LUTBox.currentIndex()
self.openTable = ClipListViewer(data,luts,selected_lut) # <- FIX THIS LINE !
self.openTable.show() # <- (2) THIS LINE
Why second widget is show before I call self.openTable.show()?
Answer : Your can see in second widget initiate in last line of code your see QtGui.QWidget.show(self) has be call before end of initiate;
class ClipListViewer(QtGui.QWidget):
def __init__(self, data, luts, selected_lut, parent = None):
super(ClipListViewer,self).__init__()
.
.
.
self.show() # <- THIS LINE
Regards,