Missing node attributes for jinja2

[The-Compiler]

It looks like the stubs for jinja2 are missing attributes for its node objects.

For example, this works fine:

import jinja2
import jinja2.nodes

template = jinja2.Environment().parse('{{ foo.bar }}')
nodes = list(template.iter_child_nodes())
nodes = list(nodes[0].iter_child_nodes())
node = nodes[0]
assert isinstance(node, jinja2.nodes.Getattr)
print(node.attr)
print(node.node)

but mypy says:

x.py:9: error: "Getattr" has no attribute "attr"
x.py:10: error: "Getattr" has no attribute "node"

because of:

typeshed/third_party/2and3/jinja2/nodes.pyi

Lines 160 to 164 in b2cd972

	class Getattr(Expr):
	fields: Any
	def as_const(self, eval_ctx: Optional[Any] = ...): ...
	def can_assign(self): ...

cc @rowillia who originally added them in #722

[srittau]

I guess that's true for all attributes that are added dynamically via the fields class var. Patches welcome!

[utkarsh2102]

Instead of Any, can't we define the fields for all the attributes? (45 such declarations at the moment).
That is something like, fields = ('node', 'attr', 'ctx') instead of what it is now?

[srittau]

@utkarsh2102 I think this is what we need to do here.

[The-Compiler]

FWIW this would be obsoleted by #5423.

[srittau]

Closing as the jinja2 stubs will be removed in a few months.