* apt/package.py: Where possible, derive apt.package.Record from collections.Mapping.

This works on Python 2.6 and newer and enhances the Record class with some new methods
on these platforms, e.g. keys().

1 files changed, 12 insertions, 1 deletions

diff --git a/apt/package.py b/apt/package.py
index 1a2626fa..411f9635 100644
--- a/apt/package.py
+++ b/apt/package.py
@@ -28,6 +28,11 @@ import socket
 import subprocess
 import urllib2
 import warnings
+try:
+    from collections import Mapping
+except ImportError:
+    # (for Python < 2.6) pylint: disable-msg=C0103
+    Mapping = object
 
 import apt_pkg
 import apt.progress
@@ -145,7 +150,7 @@ class Origin(object):
                                             self.site, self.trusted)
 
 
-class Record(object):
+class Record(Mapping):
     """Represent a pkgRecord.
 
     It can be accessed like a dictionary and can also give the original package
@@ -155,6 +160,9 @@ class Record(object):
     def __init__(self, record_str):
         self._rec = apt_pkg.ParseSection(record_str)
 
+    def __hash__(self):
+        return hash(self._rec)
+
     def __str__(self):
         return str(self._rec)
 
@@ -183,6 +191,9 @@ class Record(object):
         """deprecated form of ``key in x``."""
         return key in self._rec
 
+    def __len__(self):
+        return len(self._rec)
+
 
 class Version(object):
     """Representation of a package version.