Add a method 'Name.assignment_indexes', to process tuple assignments.

jedi/evaluate/__init__.py

@@ -131,7 +131,23 @@ class Evaluator(object):
         if isinstance(stmt, FakeStatement):
             return stmt.children  # Already contains the results.
 
-        result = self.eval_element(stmt.get_rhs())
+        types = self.eval_element(stmt.get_rhs())
+
+        if seek_name:
+            for index in seek_name.assignment_indexes():
+                new_types = []
+                for r in types:
+                    try:
+                        func = r.get_exact_index_types
+                    except AttributeError:
+                        debug.warning("Invalid tuple lookup #%s of result %s in %s",
+                                      index, types, seek_name)
+                    else:
+                        try:
+                            new_types += func(index)
+                        except IndexError:
+                            pass
+                types = new_types
 
         ass_details = stmt.assignment_details
         if ass_details and ass_details[0][1] != '=' and not isinstance(stmt, er.InstanceElement):  # TODO don't check for this.
@@ -160,8 +176,8 @@ class Evaluator(object):
             for ass_expression_list, op in ass_details:
                 new_result += finder.find_assignments(ass_expression_list[0], result, seek_name)
             result = new_result
-        debug.dbg('eval_statement result %s', result)
-        return result
+        debug.dbg('eval_statement result %s', types)
+        return types
 
     def eval_element(self, element):
         if isinstance(element, (pr.Name, pr.Literal)) or pr.is_node(element, 'atom'):

jedi/evaluate/finder.py

@@ -275,7 +275,7 @@ class NameFinder(object):
             check_instance = stmt.instance
             stmt = stmt.var
 
-        types += evaluator.eval_statement(stmt, seek_name=unicode(self.name_str))
+        types += evaluator.eval_statement(stmt, seek_name=name)
 
         # check for `except X as y` usages, because y needs to be instantiated.
         p = stmt.parent

jedi/parser/representation.py

@@ -225,6 +225,28 @@ class Name(_Leaf):
     def get_definition(self):
         return self.parent.get_parent_until((ArrayStmt, StatementElement, Node), reverse=True)
 
+    def assignment_indexes(self):
+        """
+        Returns an array of ints of the indexes that are used in tuple
+        assignments.
+
+        For example if the name is ``y`` in the following code::
+
+            x, (y, z) = 2, ''
+
+        would result in ``[1, 0]``.
+        """
+        indexes = []
+        node = self.parent
+        while node is not None:
+            if is_node(node, 'testlist_comp') or is_node(node, 'testlist_star_expr'):
+                for i, child in enumerate(node.children):
+                    if child == self:
+                        indexes.insert(0, i)
+
+            node = node.parent
+        return indexes
+
 
 class Literal(_Leaf):
     def eval(self):