How to change Qtablewidget's specific cells background color in pyqt

Question

I am new in pyqt4 and I can't figure out how to do this. I have a QtableWidget with data in it. I want to change some background color of the tableWidget's cells.

I tried self.tableWidget.item(3, 5).setBackground(QtGui.QColor(100,100,150)) and it returns this error:

AttributeError: 'NoneType' object has no attribute 'setBackground'

What should I do?

Cremate

I'm not familiar with pyqt4 myself, but maybe you could add an SSCCE? That might make it easier for others to reproduce your problem. – Armillary

Answer 1

You must first create an item in that place in the table, before you can set its background color.

self.tableWidget.setItem(3, 5, QtGui.QTableWidgetItem())
self.tableWidget.item(3, 5).setBackground(QtGui.QColor(100,100,150))

Wheeling

Works the same way in PyQt5 still. – Atomics

Answer 2

import sys
from PyQt4 import QtGui, QtCore

lista = ['aa', 'ab', 'ac']
listb = ['ba', 'bb', 'bc']
listc = ['ca', 'cb', 'cc']
mystruct = {'A':lista, 'B':listb, 'C':listc}

class MyTable(QtGui.QTableWidget):
    def __init__(self, thestruct, *args):
        QtGui.QTableWidget.__init__(self, *args)
        self.data = thestruct
        self.setmydata()

    def setmydata(self):
        n = 0
        for key in self.data:
            m = 0
            for item in self.data[key]:
                newitem = QtGui.QTableWidgetItem(item)
                if key == 'A':
                    newitem.setBackground(QtGui.QColor(100,100,150))
                elif key == 'B':
                    newitem.setBackground(QtGui.QColor(100,150,100))
                else:
                    newitem.setBackground(QtGui.QColor(150,100,100))
                self.setItem(m, n, newitem)
                m += 1
            n += 1

def main(args):
    app = QtGui.QApplication(args)
    table = MyTable(mystruct, 5, 3)
    table.show()
    sys.exit(app.exec_())

if __name__=="__main__":
    main(sys.argv)

Slightly Modifiled version of http://www.saltycrane.com/blog/2006/10/qtablewidget-example-using-python-24/

Ranket

This is a too complex example for a tiny problem – Katherinakatherine