From 0050142424f91d3ccf48fa55f08572dc461fb82b Mon Sep 17 00:00:00 2001
From: Alexandru Savulescu <alexandru.savulescu@epfl.ch>
Date: Tue, 1 Feb 2022 16:29:03 +0100
Subject: [PATCH] NEURON 8.0.x RXD node: backward compatible Callable

---
 share/lib/python/neuron/rxd/node.py | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/share/lib/python/neuron/rxd/node.py b/share/lib/python/neuron/rxd/node.py
index 84ae2855f3..2cdaa20563 100644
--- a/share/lib/python/neuron/rxd/node.py
+++ b/share/lib/python/neuron/rxd/node.py
@@ -7,7 +7,13 @@
 from .rxdException import RxDException
 import warnings
 import ctypes
-import collections
+
+# For 8.0.x release, keep backward compat with older python versions
+try:
+    from collections.abc import Callable
+except ImportError:
+    from collections import Callable
+
 
 # function to change extracellular diffusion
 set_diffusion = nrn_dll_sym("set_diffusion")
@@ -313,7 +319,7 @@ def include_flux(self, *args, **kwargs):
                 source[0]
             except:
                 raise RxDException("HocObject must be a pointer")
-        elif len(args) == 1 and isinstance(args[0], collections.Callable):
+        elif len(args) == 1 and isinstance(args[0], Callable):
             flux_type = 2
             source = args[0]
             warnings.warn(