Move iterate logic to the context.

jedi/evaluate/sys_path.py

@@ -120,10 +120,9 @@ def _paths_from_assignment(module_context, expr_stmt):
         except AssertionError:
             continue
 
-        from jedi.evaluate.iterable import py__iter__
         from jedi.evaluate.syntax_tree import is_string
         cn = ContextualizedNode(module_context.create_context(expr_stmt), expr_stmt)
-        for lazy_context in py__iter__(module_context.evaluator, cn.infer(), cn):
+        for lazy_context in cn.infer().iterate(cn):
             for context in lazy_context.infer():
                 if is_string(context):
                     yield context.obj