[Community] Calling Polygon.exterior creates noncollectable objects

[Jaakko Salli]

Hi all,
It seems that calling Polygon.exterior generates objects that are not 
collectable even by gc.collect(). Attached script reproduces the issue.

Thanks,
 Jaakko


from shapely.geometry import Polygon

import random
import gc

from pprint import pprint

random.seed()
randint = random.randint

gc.enable()
gc.set_debug(gc.DEBUG_SAVEALL)

#
# For some reason, if iterations == 1, no uncollectable
# garbage is generated.
iterations = 2

#
# Let's build some dummy polygons and call their
# exterior property.
for i in range(0, iterations):
    points = []
    x0 = x = float(randint(-100, 100))
    y0 = y = float(randint(-100, 100))
    points.append((x, y))

    for n in range(0, randint(2, 10)):
        x += float(randint(0, 100))
        y += float(randint(0, 100))
        points.append((x, y))

    points.append((x0, y))
    points.append((x0, y0))

    poly = Polygon(points)
    poly.exterior

gc.collect()

pprint(gc.garbage)

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