module' object has no attribute 'qmainwindow'

Question

I am trying to create UI using PyQt4 on centos. But When ever I am trying to load QtGui.QMainWindow I am getting the error:

Traceback(most recent call last):
   File "test.py", line 7, in <module>
    Ui_MainWindow, QtBaseClass = uic.loadUiType(ui_file_path)
   File "/usr/local/lib/python2.7/site-packages/PyQt4/uic/__init__.py", line 160, inloadUiType
return (ui_globals[winfo["uiclass"]],getattr(Qtgui, winfo["baseclass"]))
AttributeError:'module' object has no attribute 'qmainwindow'

This My Code,I am using python 2.7.9:

import sys
import os
from PyQt4 import QtCore, QtGui, uic

ui_file_path = os.getcwd()+"/test.ui" # Enter file here.

Ui_MainWindow, QtBaseClass = uic.loadUiType(ui_file_path)

class MyApp(QtGui.QMainWindow, Ui_MainWindow):
    def __init__(self):
        QtGui.QMainWindow.__init__(self)
        Ui_MainWindow.__init__(self)
        self.setupUi(self)

if __name__ == "__main__":
    app = QtGui.QApplication(sys.argv)
    window = MyApp()
    window.show()
    sys.exit(app.exec_())

Thanks in advance.

Answer 1

Forgive me if I miss the point, but I don't understand why MyApp inherits from both QtGui.QMainWindow and Ui_MainWindow.

Would something like this work for you?

import sys
import os
from PyQt4 import QtGui, uic

ui_file_path = os.path.join(os.getcwd(), "test.ui") # Enter file here.

class MyApp(QtGui.QMainWindow):
    def __init__(self):

        # Parent class init
        QtGui.QMainWindow.__init__(self) 
        # You may also write
        # super(MyApp, self).__init__()

        # Load UI
        uic.loadUi(ui_file_path, self)

if __name__ == "__main__":
    app = QtGui.QApplication(sys.argv)
    window = MyApp()
    window.show()
    sys.exit(app.exec_())

Edit

There seems to be a case issue, here.

In my Python interpreter, I get this:

import os

os.PAth 
# This prints: AttributeError: 'module' object has no attribute 'PAth'

os.path
# This works

In your case, you enter the correct case, but get an error with the attribute in an incorrect case in the error message:

class Myapp(QtGui.QMainWindow)
# AttributeError:'module' object has no attribute 'qmainwindow'

As if somewhere between the text editor and the interpreter, something had lowered the case of QMainWindow. I don't have any hypothesis regarding why this would happen, but it could be nested somewhere not obvious.

Can you reproduce in an interpreter? More explicitly, can you run a Python interpreter on the same machine and try this:

import PyQt4.QtGui
PyQt4.QtGui.QMainWindow
import os
os.PAth 

and see what errors you get?

(Note: in your comment below, there's a case error in QtGui.QMainWindow (you wrote QtGui.QMainWIndow). I suppose you made it while writing the comment, not in the code.)

Answer 2

I was having the same issue on Ubuntu 16.04, using PyQt5, and python3. This could apply to PyQt4 as well, so why not give it a shot?

I found from https://doc.bccnsoft.com/docs/PyQt5/pyqt4_differences.html# the solution to be changing QtGui.QMainWindow to QtWidget.QMainWindow as they have changed. This also needed to be applied to QApplication as well, and the import of QtGui was not needed in the code (replaced with import ..., QtWidget).

I wish you luck in solving this issue.