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I can help with questions 1 and 2 for which I find QGIS solutions quite simple. Question 1: Use the spatial query tool (see doc here and button icon below). Question 2: Use Vector > Analysis Tools > Basic Statistics (see screenshot below). It is quite intuitive to use: select the vector layer on which you need statistics (like a column sum), then select ...


A broken record here but, having the Python window opening when adding in the toolbar to your map will often tell you where the problem is in your code. But I think your problem might be with the spaces that you have in the name of your tools and buttons. Additionally there is a discrepancy between the name of your button in your Python code and the ...

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