Python QGIS tool that replaces layout text labels with attributes from an input table

[geodenn92]

Hello everyone,

I'm writing a QGIS tool and I think I got it but it doesn't work. Maybe someone can help me.

In the Qgs Project is a .csv table file with two fields and two features/Objects.

The script I'm writing is supposed to replace two textlabels in my open layout with the attributes in the second field of the table.

My script has the following procedure:

1) take the table from the project and store it in a variable

2) take the text labels from the layout and store it in a variable

3) compare the text labels with the attributes from the first field and if they are equal overwrite the text label with the content from the second field.

My script doesn't give me an error message but it is not doing anything. apparently I missed something but I don't see what it is. Hoping for help.

Here is the code:

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def getTable(self):     """gets table from the QGIS Project"""     layer = None     for lyr in QgsProject.instance().mapLayers().values():         if lyr.name() == "table":             layer = lyr             break     return layer   def setVariable(self):     """adds the table to a variable called self.inTable"""     self.inTable = self.getTable()   def changeLabel(self):       """saves the Layout label texts in a variable"""     labels = None     for l in QgsProject.instance().layoutManager().layouts()[0].items():         if isinstance(l,QgsLayoutItemLabel):             labels = l       """gets the features of the table"""     features = self.inTable.getFeatures()       """compares the list of labels with the attributes in the first     column of the features and replaces the label with the attribute     from the second column"""     for label in labels:         for feat in features:             if label == feat.attributes()[0]:                 labels[label] = feat.attributes()[1]     return labels   def run(self):     """Run method that performs all the real work"""     self.dlg.show()     # Run the dialog event loop     result = self.dlg.exec_()     # See if OK was pressed     if result:         self.setVariable()         self.changeLabel()

I guess there is something wrong in the changeLabel function but I don't see what it is. Or I completely forgot something. Perhaps my question is too specific for this forum but I thought maybe someone can help.

[buran]

Just a guess, but I would expect that QgsProject.instance().layoutManager().layouts()[0].items() would return some kind of iterable of 2-element tuples (e.g. like dict.items()) in this case l would not be an instance of QgsLayoutItemLabel.
As a side note PEP8 recommendation:

Names to Avoid

Never use the characters 'l' (lowercase letter el), 'O' (uppercase letter oh), or 'I' (uppercase letter eye) as single character variable names.

In some fonts, these characters are indistinguishable from the numerals one and zero. When tempted to use 'l', use 'L' instead.