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--- a/python/ccnet/packet.py	2020-01-04 17:50:37.897308652 +0100
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+++ b/python/ccnet/packet.py	2020-01-04 17:53:27.244882381 +0100
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@@ -72,7 +72,7 @@
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 def parse_header(buf):
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     try:
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         ver, ptype, length, id = struct.unpack(CCNET_HEADER_FORMAT, buf)
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-    except struct.error, e:
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+    except struct.error as e:
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         raise NetworkError('error when unpack packet header: %s' % e)
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     return PacketHeader(ver, ptype, length, id)