run AST toolchain on python3

diff --git a/Parser/asdl_c.py b/Parser/asdl_c.py
index 07c06dea725ff222be9e1a6dad247260b6c9292a..56140ed9fd42e058c8052b625dadbd303dd964ba 100755 (executable)
--- a/Parser/asdl_c.py
+++ b/Parser/asdl_c.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#! /usr/bin/env python3
 """Generate C code from an ASDL description."""
 
 # TO DO