Specify python3

Author: rojopolis

main.tf

@@ -1,5 +1,5 @@
 data "external" "lambda_archive" {
-    program = ["python", "${path.module}/scripts/build_lambda.py"]
+    program = ["python3", "${path.module}/scripts/build_lambda.py"]
     query = {
         src_dir     = "${var.src_dir}"
         output_path = "${var.output_path}"