From 0092d648b127341083a509a6d4c0fef3d9f07676 Mon Sep 17 00:00:00 2001
From: "Bill Chen (Mac)" <ybchen@umich.edu>
Date: Tue, 20 Aug 2024 16:21:08 -0400
Subject: [PATCH] Change to NotImplementedError for abstract function

---
 galpy/df/streamspraydf.py | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/galpy/df/streamspraydf.py b/galpy/df/streamspraydf.py
index 973304ea7..2413e3002 100644
--- a/galpy/df/streamspraydf.py
+++ b/galpy/df/streamspraydf.py
@@ -371,8 +371,7 @@ def spray_df(self, xyzpt, vxyzpt, dt):
         vxst, vyst, vzst : array, shape (N,)
             Velocities of points on the stream in the progenitor coordinates.
         """
-        warnings.warn("Not implemented!", NotImplementedError, stacklevel=1)
-        pass
+        raise NotImplementedError
 
 
 class chen24spraydf(basestreamspraydf):