From 5080848b21694d18a065451196db54fda784085c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alexander=20Bl=C3=B6meke?=
 <64038823+alexbatgithub@users.noreply.github.com>
Date: Wed, 3 Jun 2026 21:07:06 +0200
Subject: [PATCH] fix: add numpy to eval globals in eval_linKK for numpy 2.x
 compatibility

numpy 2.x changed scalar repr (e.g. np.float64(0.001) instead of 0.001), causing NameError when eval_linKK evaluated the generated circuit string in worker processes. Adding 'np': np to the eval globals dict resolves this.
---
 impedance/validation.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/impedance/validation.py b/impedance/validation.py
index ad9d2e68..f4260d85 100644
--- a/impedance/validation.py
+++ b/impedance/validation.py
@@ -281,7 +281,7 @@ def eval_linKK(elements, ts, f):
     circuit_string = circuit_string.strip(',')
     circuit_string += '])'
 
-    return eval(circuit_string, circuit_elements)
+    return eval(circuit_string, {**circuit_elements, 'np': np})
 
 
 def residuals_linKK(elements, ts, Z, f, residuals='real'):