in verbose mode, print stack trace (#1594)

Make Black failures easier to debug
psf · Aug 13, 2020 · 8842c5f · 8842c5f
1 parent 97c11f2
commit 8842c5f
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/src/black/__init__.py b/src/black/__init__.py
@@ -664,6 +664,8 @@ def reformat_one(
                 write_cache(cache, [src], mode)
         report.done(src, changed)
     except Exception as exc:
+        if report.verbose:
+            traceback.print_exc()
         report.failed(src, str(exc))
 
 
@@ -3327,7 +3329,7 @@ def do_transform(self, line: Line, string_idx: int) -> Iterator[TResult[Line]]:
         new_line.append(string_leaf)
 
         append_leaves(
-            new_line, line, LL[string_idx + 1 : rpar_idx] + LL[rpar_idx + 1 :],
+            new_line, line, LL[string_idx + 1 : rpar_idx] + LL[rpar_idx + 1 :]
         )
 
         LL[rpar_idx].remove()