Fixing polygons where edge crosses over itself using QGIS or Python?

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I am trying to remove tiny triangles from polygons. My guess is that the polygon edge crosses over itself.

Three are solid polygons, one is a polygon with an interior ring.

Are there QGIS or python tools for doing this?

When I look at the WKT for these polygons, they still only have one linear ring (or two, in the case of the one with the hollow center).











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