From 8657acdd981ce22cad0fd6fcd9c9132a1160f701 2018-09-12 16:43:30
From: Matthias Bussonnier <bussonniermatthias@gmail.com>
Date: 2018-09-12 16:43:30
Subject: [PATCH] Better alternative; try each transformer in a row,

They can actually raise a SyntaxError in which case the transformation
will be aborted.

---

diff --git a/IPython/core/inputtransformer2.py b/IPython/core/inputtransformer2.py
index 886aa02..1abd2cf 100644
--- a/IPython/core/inputtransformer2.py
+++ b/IPython/core/inputtransformer2.py
@@ -526,12 +526,13 @@ class TransformerManager:
         if not candidates:
             # Nothing to transform
             return False, lines
-
-        transformer = min(candidates, key=TokenTransformBase.sortby)
-        transformed = transformer.transform(lines)
-        if transformed is None:
-            return False, lines
-        return True, transformer.transform(lines)
+        ordered_transformers = sorted(candidates, key=TokenTransformBase.sortby)
+        for transformer in ordered_transformers:
+            try:
+                return True, transformer.transform(lines)
+            except SyntaxError:
+                pass
+        return False, lines
 
     def do_token_transforms(self, lines):
         for _ in range(TRANSFORM_LOOP_LIMIT):