How to find the intersection length between two polygons using python

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I have two polygons and i want to find the intersection line length between these polygons.

for geom1,geom2 in itertools.permutations(selection,r=2): intersection =geom1.geometry().intersection(geom2.geometry())it gives the boolean values as true/false. But i want to find the intersection length.How can i do that using python?



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