giscanner: Use unicode literals in all Python files

Add unicode_literals future import which turns any string literal
into a unicode string. Return unicode strings from the Python C extension
module. Force writing of annotations (g-ir-annotation-tool) to output utf8
encoded data to stdout.
This is an initial pass at following the "unicode sandwich"
model of programming (http://nedbatchelder.com/text/unipain.html)
needed for supporting Python 3.

https://bugzilla.gnome.org/show_bug.cgi?id=679438

1 files changed, 1 insertions, 0 deletions

diff --git a/giscanner/ast.py b/giscanner/ast.py
index db1f07be..74a70811 100644
--- a/giscanner/ast.py
+++ b/giscanner/ast.py
@@ -22,6 +22,7 @@
 from __future__ import absolute_import
 from __future__ import division
 from __future__ import print_function
+from __future__ import unicode_literals
 
 import copy
 from itertools import chain