Open demux read-only (#6)

josenavas · antgonza · commit c8419a1a5311 · 2016-10-19T12:30:05.000-06:00
diff --git a/qiita_files/demux.py b/qiita_files/demux.py
@@ -462,7 +462,7 @@ def to_per_sample_ascii(demux, samples=None):
 
 
 def _to_file(demux_fp, sample, fp, formatter):
-    with open_file(demux_fp, 'r+') as demux:
+    with open_file(demux_fp, 'r') as demux:
         with open(fp, 'wb') as out:
             for rec in _to_ascii(demux, [sample], formatter):
                 out.write(rec)
