[Python-projects] pylint/astng feature request: namedtuple support

[Maarten ter Huurne]

Hi,

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.

Bye,
		Maarten