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neighbour.py

+
+def get_neighbour(member_IP, current_member_ip, direction='left'):
+    current_member_index = member_IP.index(current_member_ip) if current_member_ip in member_IP else -1
+    if current_member_index != -1:
+        if direction == 'left':
+            if current_member_index + 1 == len(member_IP):
+                return member_IP[0]
+            else:
+                return member_IP[current_member_index + 1]
+        else:
+            if current_member_index - 1 < 0:
+                return member_IP[len(member_IP) - 1]
+            else:
+                return member_IP[current_member_index - 1]
+    else:
+        return None
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