[Python] how can I get the boundary of a shp file to be changed using python?

for example ,I have a shp file about some area, and I want to minimize the boundary of the area by python,for example,ten meters,That means generating equidistance points along the boundary of a polygon. what should I do if I want to get the changed shpfile,thanks

I searched the internet and found no answer,no code.

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