diff --git a/ob-ipython.el b/ob-ipython.el
index 043fb9a..4dd9129 100644
--- a/ob-ipython.el
+++ b/ob-ipython.el
@@ -64,6 +64,10 @@
   "Directory where resources (e.g images) are stored so that they
 can be displayed.")
 
+(defcustom ob-ipython-suppress-execution-count nil
+  "If non-nil do not show the execution count in output."
+  :group 'ob-ipython)
+
 ;; utils
 
 (defun ob-ipython--write-string-to-file (file string)
@@ -313,7 +317,7 @@ a new kernel will be started."
 
 (defun ob-ipython--maybe-run-async ()
   (when (not (ob-ipython--running-p))
-    (when-let (val (ob-ipython--dequeue 'ob-ipython--async-queue))
+    (-when-let (val (ob-ipython--dequeue 'ob-ipython--async-queue))
       (cl-destructuring-bind (code name callback args) val
         (ob-ipython--run-async code name callback args)))))
 
@@ -593,6 +597,7 @@ This function is called by `org-babel-execute-src-block'."
   (let* ((file (cdr (assoc :ipyfile params)))
          (session (cdr (assoc :session params)))
          (result-type (cdr (assoc :result-type params)))
+         (result-params (cdr (assoc :result-params params)))
          (sentinel (ipython--async-gen-sentinel)))
     (ob-ipython--create-kernel (ob-ipython--normalize-session session)
                                (cdr (assoc :kernel params)))
@@ -600,10 +605,11 @@ This function is called by `org-babel-execute-src-block'."
      (org-babel-expand-body:generic (encode-coding-string body 'utf-8)
                                     params (org-babel-variable-assignments:python params))
      (ob-ipython--normalize-session session)
-     (lambda (ret sentinel buffer file result-type)
-       (let ((replacement (ob-ipython--process-response ret file result-type)))
-         (ipython--async-replace-sentinel sentinel buffer replacement)))
-     (list sentinel (current-buffer) file result-type))
+     (lambda (ret sentinel buffer file result-type result-params)
+       (unless (member "silent" result-params)
+         (let ((replacement (ob-ipython--process-response ret file result-type)))
+           (ipython--async-replace-sentinel sentinel buffer replacement))))
+     (list sentinel (current-buffer) file result-type result-params))
     (format "%s - %s" (length ob-ipython--async-queue) sentinel)))
 
 (defun ob-ipython--execute-sync (body params)
@@ -626,7 +632,9 @@ This function is called by `org-babel-execute-src-block'."
         output
       (ob-ipython--output output nil)
       (s-concat
-       (format "# Out[%d]:\n" (cdr (assoc :exec-count ret)))
+       (if ob-ipython-suppress-execution-count
+           ""
+         (format "# Out[%d]:\n" (cdr (assoc :exec-count ret))))
        (s-join "\n" (->> (-map (-partial 'ob-ipython--render file)
                                (list (cdr (assoc :value result))
                                      (cdr (assoc :display result))))
@@ -656,7 +664,7 @@ This function is called by `org-babel-execute-src-block'."
                (let ((lines (s-lines value)))
                  (if (cdr lines)
                      (->> lines
-                          (-map 's-trim)
+                          (-map 's-trim-right)
                           (s-join "\n  ")
                           (s-concat "  ")
                           (format "#+BEGIN_EXAMPLE\n%s\n#+END_EXAMPLE"))