astroid.node_classes.Keyword lineno is None

[jameshiew]

Steps to reproduce

astroid.node_classes.Keyword does not seem to have a populated lineno. Its repr does show a line number though. Is this a bug?

#!/usr/bin/env python3
import astroid

ast = astroid.parse('foo(keyword="bar")')
expr = ast.body[0]
call = next(expr.get_children())
name, keyword = tuple(call.get_children())
print(repr(keyword), 'lineno is', keyword.lineno)

Current behavior

<Keyword l.1 at 0x10fb71898> lineno is None

Expected behavior

<Keyword l.1 at 0x10fb71898> lineno is 1

python -c "from astroid import __pkginfo__; print(__pkginfo__.version)" output

2.0.4 (on Python 3.7.0)

[PCManticore]

This is somewhat expected, but confusing at the same time. We have three types of line number:

• lineno which is the line number for nodes that don't span on multiple lines
• fromlineno and tolineno which is a span range of lines
  The keyword node is one of those nodes that can span multiple lines, so its line number is undefined.
  But I think this is a bit confusing and needs to be documented at least.