commit cd07b4da659cb5e86fe7c856aca866b9db466fce
author Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> Wed Mar 11 13:18:01 2020 -0700
committer GitHub <noreply@github.com> Wed Mar 11 13:18:01 2020 -0700
tree aa0e858862a61dc0c66405d38941ea406c4e7fd6
parent c22879914b03ff2da768e557b5c00e9c8c62c695

bpo-39520: Fix un-parsing of ext slices with no dimensions (GH-18304)

(cherry picked from commit 185903de12de8837bf0dc0008a16e5e56c66a019)

Co-authored-by: Batuhan Taşkaya <47358913+isidentical@users.noreply.github.com>

Python/ast_unparse.c

diff --git a/Python/ast_unparse.c b/Python/ast_unparse.c
index f376e86..1a7cd23 100644
--- a/Python/ast_unparse.c
+++ b/Python/ast_unparse.c
@@ -746,6 +746,7 @@
         APPEND_STR_IF(i > 0, ", ");
         APPEND(slice, (slice_ty)asdl_seq_GET(slice->v.ExtSlice.dims, i));
     }
+    APPEND_STR_IF(dims_count == 1, ",");
     return 0;
 }