diff --git a/src/agora/utils/cast.py b/src/agora/utils/cast.py
new file mode 100644
index 0000000000000000000000000000000000000000..1a9fecd37cd64a2828551dbe6120386f9033801b
--- /dev/null
+++ b/src/agora/utils/cast.py
@@ -0,0 +1,16 @@
+#!/usr/bin/env jupyter
+
+"""
+Convert some types to others
+"""
+
+
+def _str_to_int(x: str or None):
+    """
+    Cast string as int if possible. If Nonetype return None.
+    """
+    if x:
+        try:
+            return int(x)
+        except:
+            return x