don't remove from a list while iterating it

diff --git a/dns/resolver.py b/dns/resolver.py
index 17fbb08c066407f20af0249a77ae0c1b70f607dd..ec1165a4d23e8e2b7ac3cbe4f723bf12ce2f0728 100644 (file)
--- a/dns/resolver.py
+++ b/dns/resolver.py
@@ -528,7 +528,7 @@ class Resolver(object):
             while response is None:
                 if len(nameservers) == 0:
                     raise NoNameservers
-                for nameserver in nameservers:
+                for nameserver in nameservers[:]
                     timeout = self._compute_timeout(start)
                     try:
                         if tcp: