[python-debian/master] use __new__ to sub-class string: fix deprecation with 2.6

[Stefano Zacchiroli]

Closes: #524061
---
 debian/changelog        |    3 +++
 debian_bundle/deb822.py |    9 +++++----
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/debian/changelog b/debian/changelog
index 5be5b5e..8a60f6e 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -4,6 +4,9 @@ python-debian (0.1.14) UNRELEASED; urgency=low
     add matching build-dep on python-setuptools (Closes: #525694)
   * examples/deb822/: add new example render-dctrl, to render packages in
     a dctrl-tools pipeline (using Markdown as long description syntax)
+  * deb822: use __new__ to sub-class strings for case-insensitiveness;
+    former approach is deprecated with python 2.6.
+    Thanks to Loïc Minier for the patch. (Closes: #524061)
 
  -- Stefano Zacchiroli <zack at debian.org>  Sun, 26 Apr 2009 18:08:50 +0200
 
diff --git a/debian_bundle/deb822.py b/debian_bundle/deb822.py
index 97aaf20..125f451 100644
--- a/debian_bundle/deb822.py
+++ b/debian_bundle/deb822.py
@@ -1048,10 +1048,11 @@ class _CaseInsensitiveString(str):
     """Case insensitive string.
     """
 
-    def __init__(self, str_):
-        str.__init__(self, str_)
-        self.str_lower = str_.lower()
-        self.str_lower_hash = hash(self.str_lower)
+    def __new__(cls, str_):
+        s = str.__new__(cls, str_)
+        s.str_lower = str_.lower()
+        s.str_lower_hash = hash(s.str_lower)
+        return s
 
     def __hash__(self):
         return self.str_lower_hash
-- 
1.5.6.5