diff --git a/sub/bash/functions b/sub/bash/functions
index 1c4176c..2e1aa0b 100644
--- a/sub/bash/functions
+++ b/sub/bash/functions
@@ -152,7 +152,11 @@ docker_ips() {
 
 
 py() {
-    test -z "$@" && ipython -i -c "q = exit" || python3 $@
+    if [ -z "$@" -a -n "$(which ipython)" ]; then
+        ipython -i -c "q = exit"
+    else
+        python3 $@
+    fi
 }