STEP 8: The rectangle's width changed once, but doesn't continue to change. Why not?

Look at ····my_rect.set_width(50)¬. Every time the mouse moves, my_rect’s width gets set to 50, so it never changes width again! It’s always 50. To make the width change, we need to use a variable that changes. We’ll use the x-coordinate of the mouse since it changes whenever the mouse moves.

• Change the argument in .set_width() from 50 to x.

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