compare column to atributes in a loop in pyqgis processing

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I am creating a script in processing qgis. I am running the interpolation algorithm.I have two tables table A and table B. Table A contains attributes like A_test,B_test up to Z_test. Table B contains columns A_test,D_test. How can I programmatically compare the attributes from table A to the columns in table B. The table B will always be different and can contain all values in table A or limited values. The syntax I had in mind was a for loop with condition

if table A.column = table B.column
then run algorithm else
raise exception



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