False positive no-member on Shapely BaseGeometry

[gcolombeau]

Steps to reproduce

1. Use the following MCVE:

"""Shapely no-member false positive MCVE"""
from shapely import wkt
from shapely.geometry import Polygon

POLYGON = Polygon([(0, 0), (0, 1), (1, 1)])
print(POLYGON.exterior.wkt)
print(POLYGON.convex_hull.exterior.wkt)

POLYGON = wkt.loads(POLYGON.wkt)
print(POLYGON.exterior.wkt)

2. The script outputs as expected:

$ python shapely_nomember.py 
LINEARRING (0 0, 0 1, 1 1, 0 0)
LINEARRING (0 0, 0 1, 1 1, 0 0)
LINEARRING (0 0, 0 1, 1 1, 0 0)

Current behavior

The no-member error is emitted for all but the first exterior attribute:

$ pylint shapely_nomember.py 
************* Module shapely_nomember
shapely_nomember.py:7:6: E1101: Instance of 'BaseGeometry' has no 'exterior' member (no-member)
shapely_nomember.py:10:6: E1101: Instance of 'BaseGeometry' has no 'exterior' member (no-member)

I haven't properly checked but this behavior may be seen on other attributes of BaseGeometry

Expected behavior

No error should be emitted.

pylint --version output

pylint 2.2.2 astroid 2.1.0 Python 3.6.6 (default, Jul 20 2018, 09:39:42) [GCC 5.4.0 20160609]

shapely 1.6.4