Improve Cache()

Add the ability to create new Cache() objects from the current one (in the same directory). Allow the storage of int() (via str()). Don't store the key in the feed (useless, and not keeping it might make this service a little more less privacy-infrighting).

morss.py

@@ -146,7 +146,7 @@ class Cache:
 			return None
 
 	def set(self, key, content):
-		self._cache[key] = b64encode(content or '')
+		self._cache[key] = b64encode(str(content) or '')
 
 	def save(self):
 		if len(self._cache) == 0:
@@ -155,7 +155,6 @@ class Cache:
 		out = []
 		for (key, bdata) in self._cache.iteritems():
 			out.append(str(key) + "\t" + bdata)
-		out.append("_key\t" + self._key)
 		txt = "\n".join(out)
 
 		if not os.path.exists(self._dir):
@@ -170,6 +169,13 @@ class Cache:
 
 		return time.time() - os.path.getmtime(self._file) < sec
 
+	def new(self, key):
+		""" Returns a Cache object in the same directory """
+		if key != self._key:
+			return Cache(self._dir, key)
+		else:
+			return self
+
 class SimpleDownload(urllib2.HTTPCookieProcessor):
 	"""
 	Custom urllib2 handler to download a page, using etag/last-modified headers,