Fix repr unicode handling

Python2 requires utf-8 encoded bytestring
Python3 requires unicode string

tests/unit/test_photos.py

@@ -606,6 +606,11 @@ class TestPhotoObject(TestPhotos):
                                                            "name": "Test Name"})
         self.assertEqual(repr(photo), "<Photo name='Test Name'>")
 
+    def test_photo_object_repr_with_unicode_id(self):
+        """ Ensure that a unicode id is correctly represented """
+        photo = trovebox.objects.photo.Photo(self.client, {"id": "\xfcmlaut"})
+        self.assertIn(repr(photo), [b"<Photo id='\xc3\xbcmlaut'>", "<Photo id='\xfcmlaut'>"])
+
     @mock.patch.object(trovebox.Trovebox, 'post')
     def test_photo_object_create_attribute(self, _):
         """

trovebox/objects/trovebox_object.py

@@ -1,6 +1,10 @@
 """
 Base object supporting the storage of custom fields as attributes
 """
+
+from __future__ import unicode_literals
+import sys
+
 class TroveboxObject(object):
     """ Base object supporting the storage of custom fields as attributes """
     _type = "None"
@@ -41,11 +45,17 @@ class TroveboxObject(object):
 
     def __repr__(self):
         if self.name is not None:
-            return "<%s name='%s'>" % (self.__class__.__name__, self.name)
+            value = "<%s name='%s'>" % (self.__class__.__name__, self.name)
         elif self.id is not None:
-            return "<%s id='%s'>" % (self.__class__.__name__, self.id)
+            value = "<%s id='%s'>" % (self.__class__.__name__, self.id)
         else:
-            return "<%s>" % (self.__class__.__name__)
+            value = "<%s>" % (self.__class__.__name__)
+
+        # Python2 requires a bytestring
+        if sys.version < '3':
+            return value.encode('utf-8')
+        else: # pragma: no cover
+            return value
 
     def get_fields(self):
         """ Returns this object's attributes """