logilab-astng #8766 support for namedtuple [done]

Maarteen in python-projects:

on the following program pylint issues a false positive:

from urlparse import urlparse
print urlparse('http://www.logilab.org/project/pylint').path

E1101:  2: Instance of 'ParseResult' has no 'path' member

Here astng correctly infers that urlparse() returns a ParseResult instance, but doesn't know that ParseResult has a "path" member.

This is the line in urlparse.py that defines ParseResult:

class ParseResult(namedtuple('ParseResult', 'scheme netloc path params query fragment'), ResultMixin):

The namedtuple() function is new in Python 2.6 and is documented here:

http://docs.python.org/library/collections.html#collections.namedtuple

The class using namedtuple() explicitly lists the members it acquires; it would be very useful if pylint would consider these members present.