There is still problem with col_offset is some situations, for example col_offset of the ast.Attribute should be 4 but is 0 instead:

>>> for x in ast.walk(ast.parse('foo.bar')):
...     if hasattr(x, 'col_offset'):
...         print("%s: %d" % (x, x.col_offset))
... 
<_ast.Expr object at 0x7fcdc84722b0>: 0
<_ast.Attribute object at 0x7fcdc84723c8>: 0
<_ast.Name object at 0x7fcdc8472438>: 0

Is there any solution to this problem? It causes problems in python support in KDevelop (kdev-python).