Error: 'module' object has no attribute 'QVBoxLayout'

[jettam]

When I run this code I get this error. Any help please.    Yes I am running it from a module. 

# Error: 'module' object has no attribute 'QVBoxLayout'
# Traceback (most recent call last):
#   File "<maya console>", line 4, in <module>
#   File "E:\ProfessionalDevelopment\python\Introduction to Python Scripting in Maya\cgcircuitPython\wk6\geomGenerator.py", line 18, in run
#     win = GeometryGenerator(parent=getMayaWindow())
#   File "E:\ProfessionalDevelopment\python\Introduction to Python Scripting in Maya\cgcircuitPython\wk6\geomGenerator.py", line 36, in __init__
#     layout = QtGui.QVBoxLayout()
# AttributeError: 'module' object has no attribute 'QVBoxLayout' #

import os
from PySide2 import QtWidgets, QtCore, QtUiTools, QtGui
from shiboken2 import wrapInstance
import maya.cmds as mc
import maya.OpenMayaUI as omui

def getMayaWindow():
    ''' pointer to the maya main window '''
    ptr = omui.MQtUtil.mainWindow()
    if ptr:
        return wrapInstance(long(ptr), QtWidgets.QMainWindow)

def run():
    ''' builds our UI '''
    global win
    win = GeometryGenerator(parent=getMayaWindow())
    win.show()

uiFilePath = os.path.join( os.path.dirname(__file__) , 'geomGenerator_v001.ui')

class GeometryGenerator(QtWidgets.QDialog):
   
    def __init__(self,parent=None):
        super(GeometryGenerator,self).__init__(parent)

        loader = QtUiTools.QUiLoader()    
        print('uiFilePath: {0}'.format(uiFilePath))  
        xfile = QtCore.QFile(uiFilePath)        
        xfile.open(QtCore.QFile.ReadOnly)        
        self.ui = loader.load(xfile, parentWidget=self)        
        xfile.close()

        layout = QtGui.QVBoxLayout()
        layout.addWidget(self.ui)
        self.setLayout(layout)

[Justin Israel]

When you see errors like this you need to think about what it is trying to tell you. It says the QtGui module has no QVBoxLayout. So what you want to do next is check the documentation to know where things are. 

http://doc.qt.io/qt-5/qvboxlayout.html

Note that in Qt5, widgets have been moved into a QtWidgets namespace. So if you are following Qt4 tutorials then you will need to make that adjustment to your code. 

Here is the PyQt version of the difference between v4 and v5

http://pyqt.sourceforge.net/Docs/PyQt5/pyqt4_differences.html

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[jettam]

The only way I was able to solve this was not from the documentation, but from an earlier post I sent out which told me Qt has a new module called QtWidgets it holds many of the attributes that were previously found in QtGui. 

There was nothing in the documentation that I could understand (as a freshman) That told me that QVBoxLayout is found in QtWidgets. And that the syntax should be written like this QtWidgets.QVBoxLayout(). So reading the documentation unfortunately didn't clue me into the answer. 

Ultimately the answer was

layout = QtGui.QVBoxLayout()       #  from this        
layout = QtWidgets.QVBoxLayout()   #  into this

FYI; Sublime auto-fills in QtGui.QVBoxLayout and it also auto-filled in QtWidgets.QVBoxLayout which made me think it did exist in QtGui.

The only way I solved this was not from looking a the Qt Documentation, 

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[Justin Israel]

On Wed, Oct 18, 2017 at 10:12 AM jettam <justin...@gmail.com> wrote:

The only way I was able to solve this was not from the documentation, but from an earlier post I sent out which told me Qt has a new module called QtWidgets it holds many of the attributes that were previously found in QtGui. 

There was nothing in the documentation that I could understand (as a freshman) That told me that QVBoxLayout is found in QtWidgets. And that the syntax should be written like this QtWidgets.QVBoxLayout(). So reading the documentation unfortunately didn't clue me into the answer. 

Ultimately the answer was

layout = QtGui.QVBoxLayout()       #  from this        
layout = QtWidgets.QVBoxLayout()   #  into this

FYI; Sublime auto-fills in QtGui.QVBoxLayout and it also auto-filled in QtWidgets.QVBoxLayout which made me think it did exist in QtGui.

It would depend on what paths your IDE is set up with and looking at to provide completions. 

When you look at the Qt docs, you can look at the very top of the documentation for class, to see under which module/namespace it resides. Also there is documentation that breaks down classes by each module:

http://doc.qt.io/qt-5/modules-cpp.html

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