Where could someone study how to build python expressions for qgis python console and

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How can I build a feature request expression using variable inside expression?For example

values = [1, 2, 3]for j in range( y ):it = vl.getFeatures( QgsFeatureRequest().setFilterExpression ( u'"field_name" = values[ j ]' ) )or (I have also tried sthing like this)

it = vl.getFeatures( QgsFeatureRequest().setFilterExpression ( u'"field_name" = values[%d]' % j) )Where could someone study how to build these kind of expressions?



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