Using a variable inside an object name on python

Question

I am wanting to use a variable inside an object name. To set the Qlabel widget, I would normally do

self.label1.setText('label 1')
self.label2.setText('label 2')

I'm wanting to use:

x = 1
y = 2

self.label(x).setText('label 1')
self.label(y).setText('label 2')

I've tried

name = ('self.label%d' % x)
name.setText('label 1')

(self.label+str(x)).setText('label 1')

I've tried lists as well, but can't seem to get it to work. Any advice?

Here is full code (using qt Designer, so I import the .ui/.py file:

from PyQt4 import QtGui, QtCore, QtTest
import pandas as pd
import sys

import mainWin



class mainWin(QtGui.QMainWindow,mainWin.Ui_MainWindow):
    def __init__(self):
        super(self.__class__, self).__init__()
        self.setupUi(self)
        num = len(cat)
        x = 1
        y = 2
        self.drink_label(x).setText('label 1')

def main():
    app = QtGui.QApplication(sys.argv)
    form  = mainWin()

    form.show()
    sys.exit(app.exec_())

if __name__== '__main__':
   main()

How are you creating the labels? Can you show the classes __init__() function? — Danielle M., Jan 11 '19 at 19:46
@Jason use [getattr](https://docs.python.org/3/library/functions.html#getattr): `getattr(self, "drink_label{}".format(x)).setText('label 1')` — eyllanesc, Jan 11 '19 at 19:53
@eyllanesc that was it! I kept trying to use the . after self or before the 'drink_label{}'. Thank you so much! — Jason, Jan 11 '19 at 19:58

Tom Dee · Answer 1 · 2019-01-13T11:39:23.757

0

Probably the best way of doing this is to have a list of Qlabels then access them like this:

self.labels[x].setText('label 1')

Can also use getattr like this:

getattr(self, "label" + x).setText('label 1')

Otherwise you could use eval however that isn't really recommended for security issues and makes the code more confusing:

eval("self.label(" + x + ").setText('label 2')")

edited Jan 13 '19 at 11:39

answered Jan 11 '19 at 19:48

Tom Dee

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Using a variable inside an object name on python

1 Answers1