port compare-structures action

actions/ost-compare-structures

@@ -513,7 +513,7 @@ def _RevertChainNames(ent):
             used_names[original_name] += 1
     for chain in ent.chains:
         editor.RenameChain(chain, reverted_chains[chain.name[:-len(suffix)]])
-    rev_out = ["%s -> %s" % (on, nn) for on, nn in reverted_chains.items()]
+    rev_out = ["%s -> %s" % (on, nn) for on, nn in list(reverted_chains.items())]
     ost.LogInfo("Reverted chains: %s" % ", ".join(rev_out))
 
 
@@ -989,9 +989,20 @@ def _Main():
         with open(opts.output, "w") as outfile:
             json.dump(result, outfile, indent=4, sort_keys=True)
 
+class _Unbuffered(object):
+    # https://stackoverflow.com/questions/45263064/how-can-i-fix-this-valueerror-cant-have-unbuffered-text-i-o-in-python-3/45263101
+    def __init__(self, stream):
+        self.stream = stream
+    def write(self, data):
+        self.stream.write(data)
+        self.stream.flush()
+    def writelines(self, datas):
+        self.stream.writelines(datas)
+        self.stream.flush()
+    def __getattr__(self, attr):
+        return getattr(self.stream, attr)
 
 if __name__ == '__main__':
     # make script 'hot'
-    unbuffered = os.fdopen(sys.stdout.fileno(), 'w', 0)
-    sys.stdout = unbuffered
+    sys.stdout = _Unbuffered(sys.stdout)
     _Main()