Shapovy intersections against harmonious relations - inaccurate?

Question

Interestingly, I do not think so or is this a mistake:

I have a linear line and a polygon, I create the intersection points of the line and the border of the polygon

These intersection points must cross (at least touch) the boundary of the polygon, right?

from shapely import geometry,wkt
line = geometry.LineString([(13.51039642756912, 52.598912814414675), (13.525173800277184, 52.60620240344557)])
poly = geometry.Polygon ([(13.52072838433517, 52.61735554606274), (13.52233276805985, 52.59511541819082), (13.51312087418833, 52.59394589806786),( 13.51526963068252, 52.60338701649216),( 13.51836560008325 ,52.6009395669487), (13.52072838433517, 52.61735554606274)])

ips = line.intersection(poly.boundary)
for i in ips:
    print i.touches(poly.boundary)  # should touch but it doesnt!!!!

>>>False

Answer 1

This is not a mistake, but it is a common question.

epsilon. ( ). DE-9IM , "", noding (, , UPDATE: JTS Topology Suite, DE-9IM , , GEOS -).

, , , epsilon , . :.

EPS = 1e-15
for i in ips:
    print i.distance(poly) < EPS