From bf0bba1dd2afa073e7f73c3fb7a1327c09427be8 Mon Sep 17 00:00:00 2001
From: John <japarker@uchicago.edu>
Date: Thu, 19 Mar 2020 23:44:05 -0500
Subject: [PATCH] bug fix for python3.6

---
 setup.py         | 2 +-
 stoked/solver.py | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/setup.py b/setup.py
index e0fc22b..53a8b7d 100644
--- a/setup.py
+++ b/setup.py
@@ -11,7 +11,7 @@ def read(fname):
 AUTHOR = 'John Parker'
 KEYWORDS = 'stokesian dynamics brownian'
 # REQUIRES_PYTHON = '>=3.6.0'
-VERSION = '0.2'
+VERSION = '0.2.1'
 LICENSE = 'MIT'
 
 REQUIRED = [
diff --git a/stoked/solver.py b/stoked/solver.py
index 2e2e9d4..72e9667 100644
--- a/stoked/solver.py
+++ b/stoked/solver.py
@@ -375,7 +375,7 @@ def _combine_pairwise_interactions(self):
             if len(pairwise_forces) > 1:
                 for pf in pairwise_forces:
                     self.interactions.remove(pf)
-                self.interactions.append(sum(pairwise_forces[1:], start=pairwise_forces[0]))
+                self.interactions.append(sum(pairwise_forces[1:], pairwise_forces[0]))
 
 def brownian_dynamics(*, temperature, dt, position, drag, orientation=None, 
                  force=None, torque=None, interactions=None, constraint=None):