From e5ad12cdb1257049fb72c15bc6e09a48f4dc0330 Mon Sep 17 00:00:00 2001
From: Pete Shadbolt <hello@peteshadbolt.co.uk>
Date: Sun, 6 Nov 2016 09:43:59 +0000
Subject: [PATCH] Reduced node-already-exists to a warning

---
 abp/graphstate.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/abp/graphstate.py b/abp/graphstate.py
index b8f4fde..417d61f 100644
--- a/abp/graphstate.py
+++ b/abp/graphstate.py
@@ -71,7 +71,10 @@ class GraphState(object):
             fred
 
         """
-        assert not node in self.node, "Node {} already exists".format(v)
+        if node in self.node:
+            print "Warning: node {} already exists".format(node)
+            return
+
         default = kwargs.get("default", "identity")
         self.adj[node] = {}
         self.node[node] = {}