diff --git a/bind/.gitignore b/bind/.gitignore
index e443899..9f2e149 100644
--- a/bind/.gitignore
+++ b/bind/.gitignore
@@ -1 +1,2 @@
-minicalo.cpython-38-x86_64-linux-gnu.so
\ No newline at end of file
+minicalo.cpython-38-x86_64-linux-gnu.so
+tmp_test*
\ No newline at end of file
diff --git a/bind/G4Calo.py b/bind/G4Calo.py
index 4534b1d..53b7edf 100644
--- a/bind/G4Calo.py
+++ b/bind/G4Calo.py
@@ -397,4 +397,9 @@ def display_event(gd : GeometryDescriptor,
     if renderer is not None:
         fig.show(renderer=renderer) 
     else:
-        fig.show() 
\ No newline at end of file
+        fig.show() 
+
+
+
+def to_numpy(df_column):
+    return np.array(df_column.tolist())
\ No newline at end of file