add getter for possible activity entry keys

debug.py

@@ -1,8 +1,11 @@
 from quora import Quora, Activity
 
-activity = Quora.get_activity('Christopher-J-Su')
+quora = Quora()
+activity = quora.get_activity('Christopher-J-Su')
 # print activity.answers
 # print activity.question_follows
 print activity.user_follows
 # print activity.upvotes
-# print activity.questions
+# print activity.questions
+
+print quora.get_activity_keys()

quora/pyquora.py

@@ -3,6 +3,9 @@
 import feedparser
 import re
 
+### Configuration ###
+POSSIBLE_FEED_KEYS = ['link', 'id', 'published', 'title', 'summary']
+
 ### Enumerated Types ###
 def enum(*sequential, **named):
     enums = dict(zip(sequential, range(len(sequential))), **named)
@@ -29,7 +32,7 @@ def get_count_for_user_href(soup, user, suffix):
 
 def build_feed_item(item):
     dict = {}
-    keys = ['link', 'id', 'published', 'title', 'summary']
+    keys = POSSIBLE_FEED_KEYS
     for key in keys:
         if key in item.keys():
             dict[key] = item[key]
@@ -118,6 +121,10 @@ def get_activity(user):
                     activity.questions.append(build_feed_item(entry))
         return activity
 
+    @staticmethod
+    def get_activity_keys():
+        return POSSIBLE_FEED_KEYS
+
 class Activity:
     def __init__(self, upvotes=[], user_follows=[], question_follows=[], answers=[], questions=[]):
         self.upvotes = upvotes