add simple write method

src/utilities/feedfile.py

@@ -1 +1,31 @@
 __author__ = 'stubbfel'
+
+import feedparser
+from utilities.textfile import TextFile
+
+
+class FeedFile(TextFile):
+
+    def __init__(self, filename):
+        """
+        init class
+        :param filename: path to the file
+        """
+        super(FeedFile, self).__init__(filename)
+
+    def read_feed_file(self):
+        """
+        method read and convert the content of the file to a FeedParserDict
+        :return: dict - feed object
+        """
+        feed_str = self.read_text_file()
+        return feedparser.parse(feed_str)
+
+    def write_feed_file(self, feed, serializer):
+        assert isinstance(feed, feedparser.FeedParserDict)
+
+        if serializer is None:
+            feed_string = str(feed)
+        else:
+            feed_string = serializer.toString(feed)
+        self.write_text_file(feed_string)