I'm pretty new to python and pyqgis so the question will be pretty trivial..

I'm writing a plugin and in one script I have a class and some internal functions..

class CreateModelDialog(QDialog, FORM_CLASS):
    def __init__(self, iface):
    def openSr(self):
        projSelector = QgsGenericProjectionSelector()

Then I have to use the last line (that is the EPSG cose selected and displayed in srText QLineEdit of the QT dialog in another function of the same script:

def createModel(self):
        modelName = self.bxDBname.text()
        modelType = self.cmbBxModelType.currentText()
        crs = self.srText.setText(projSelector.selectedAuthId())

createModel(modelName, modelType, crs)

But I get an error:

NameError: global name 'projSelector' is not defined

I'm sure that is due to the fact that projSelector is a variable that exists only in the local open Sr function.

So the question is: how should I modify the function in order to make the variable callable?

1 Answer 1


You can create instance vairiables with self keyword:

def openSr(self):
        self.projSelector = QgsGenericProjectionSelector()

Now your self.projSelector variable is ready to use in other methods.

dialog = CreateModelDialog(iface)

Will return your variable with this object.

  • Tried with your command but it doesn't work.. I solved creating projSelector as a global variable: global projSelector
    – matteo
    Nov 24, 2015 at 9:49

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