Use keys and values as separate arguments for nodes.Dict

Dict was a bit different that the corresponding class from the
builtin ast module with respect to how it was initialized.
Instead of accepting a list of pairs, the initializer accepts
two arguments, one for keys, the other for values. For backward
compatibility, the class gained a new .items property.

1 files changed, 5 insertions, 1 deletions

diff --git a/astroid/tree/rebuilder.py b/astroid/tree/rebuilder.py
index 81ef48d4..1d994876 100644
--- a/astroid/tree/rebuilder.py
+++ b/astroid/tree/rebuilder.py
@@ -370,7 +370,11 @@ class TreeRebuilder(object):
         """visit a Dict node by returning a fresh instance of it"""
         newnode = nodes.Dict(node.lineno, node.col_offset, parent)
         items = list(self._visit_dict_items(node, parent, newnode))
-        newnode.postinit(items)
+        if items:
+            keys, values = zip(*items)
+        else:
+            keys, values = [], []
+        newnode.postinit(keys, values)
         return newnode
 
     def visit_dictcomp(self, node, parent):