Use io.open() to avoid deprecation warning about 'U' mode

Use io.open() which has a consistent interface between Python 2 and Python 3.
In particular, `newline` parameter is meant to control "universal new lines"
and it is None by default so we don't need to specify it.

1 files changed, 2 insertions, 1 deletions

diff --git a/logilab/common/fileutils.py b/logilab/common/fileutils.py
index 366d23d..48828fb 100644
--- a/logilab/common/fileutils.py
+++ b/logilab/common/fileutils.py
@@ -28,6 +28,7 @@ from __future__ import print_function
 
 __docformat__ = "restructuredtext en"
 
+import io
 import sys
 import shutil
 import mimetypes
@@ -282,7 +283,7 @@ def lines(path, comments=None):
 
     :warning: at some point this function will probably return an iterator
     """
-    stream = open(path, 'U')
+    stream = io.open(path)
     result = stream_lines(stream, comments)
     stream.close()
     return result