How to unify the tables in the part model into the table of the assembly file？

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Hello！ How to unify the tables in the part model into the table of the assembly file, so that the parts can be modified by python code just by entering the parameters in the assembly file table? For example, I want to enter the length, width and height of the cube in the A4 assembly file table, and the dimensions of the part cube inserted in the A4 assembly file are modified。 Thank you~