ePub: improve compatibility with Python 2.

diff --git a/lib/scripts/docbook2epub.py b/lib/scripts/docbook2epub.py
index 1d39962be54b18b1cdd815e96c842972daf6cf33..94375a9fb5444ec2f9edf2968d0729b494875060 100644 (file)
--- a/lib/scripts/docbook2epub.py
+++ b/lib/scripts/docbook2epub.py
@@ -19,6 +19,7 @@ import shutil
 import sys
 import tempfile
 import zipfile
+from io import open  # Required for Python 2.
 
 
 def _parse_nullable_argument(arg):