Dockerfile: Set the python encoding to UTF-8. This is more of a python2 issue. In python3, *I believe* this is default. This comes up mainly when not using a TTY where stdout can have a determined encoding. See for more details ( <http://www.macfreek.nl/memory/Encoding_of_Python_stdout> ).

Dockerfile

@@ -11,6 +11,7 @@ MAINTAINER Project Jupyter <jupyter@googlegroups.com>
 ENV LANGUAGE en_US.UTF-8
 ENV LANG en_US.UTF-8
 ENV LC_ALL en_US.UTF-8
+ENV PYTHONIOENCODING UTF-8
 
 # Python binary and source dependencies
 RUN apt-get update -qq \