Update seeds tooling to Python 3

All the other tooling scripts require Python 3, it makes sense to do so
here too.

Also document the dependency on python3-dnspython.

1 files changed, 7 insertions, 7 deletions

diff --git a/contrib/seeds/makeseeds.py b/contrib/seeds/makeseeds.py
index 95498d20e2..33fbb5851e 100755
--- a/contrib/seeds/makeseeds.py
+++ b/contrib/seeds/makeseeds.py
@@ -1,5 +1,5 @@
-#!/usr/bin/env python
-# Copyright (c) 2013-2016 The Bitcoin Core developers
+#!/usr/bin/env python3
+# Copyright (c) 2013-2017 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 #
@@ -14,13 +14,13 @@ MIN_BLOCKS = 337600
 
 # These are hosts that have been observed to be behaving strangely (e.g.
 # aggressively connecting to every node).
-SUSPICIOUS_HOSTS = set([
+SUSPICIOUS_HOSTS = {
     "130.211.129.106", "178.63.107.226",
     "83.81.130.26", "88.198.17.7", "148.251.238.178", "176.9.46.6",
     "54.173.72.127", "54.174.10.182", "54.183.64.54", "54.194.231.211",
     "54.66.214.167", "54.66.220.137", "54.67.33.14", "54.77.251.214",
     "54.94.195.96", "54.94.200.247"
-])
+}
 
 import re
 import sys
@@ -104,7 +104,7 @@ def filtermultiport(ips):
     hist = collections.defaultdict(list)
     for ip in ips:
         hist[ip['sortkey']].append(ip)
-    return [value[0] for (key,value) in hist.items() if len(value)==1]
+    return [value[0] for (key,value) in list(hist.items()) if len(value)==1]
 
 # Based on Greg Maxwell's seed_filter.py
 def filterbyasn(ips, max_per_asn, max_total):
@@ -164,9 +164,9 @@ def main():
 
     for ip in ips:
         if ip['net'] == 'ipv6':
-            print '[%s]:%i' % (ip['ip'], ip['port'])
+            print('[%s]:%i' % (ip['ip'], ip['port']))
         else:
-            print '%s:%i' % (ip['ip'], ip['port'])
+            print('%s:%i' % (ip['ip'], ip['port']))
 
 if __name__ == '__main__':
     main()