diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index b6fc376..686ce3c 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -3249,6 +3249,9 @@
 	/* check for non-alpha command */
 	if (p == cmd && vim_strchr((char_u *)"@*!=><&~#", *p) != NULL)
 	    ++p;
+	/* for python 3.x: ":py3*" commands completion */
+	if (cmd[0] == 'p' && cmd[1] == 'y' && p == cmd + 2 && *p == '3')
+	    ++p;
 	len = (int)(p - cmd);
 
 	if (len == 0)