variable initialisation improved for feeds

blogs-i-read_v2.py

@@ -53,8 +53,16 @@ def get_timestamp(ts):
         sys.exit(1)
         
 def examine_feed(url):
-    (md5, post_title, post_url, last_update) = ['', '', '', 0]
+    (md5, post_title, post_url, last_update) = get_default_values(url)
     # logger.debug(f'examine_feed {url}')
+    if url in md5_sums:
+        # get stored values if they exist
+        try:
+            last_update = md5_sums[url]['timestamp']
+            post_title = md5_sums[url]['post_title']
+            post_url = md5_sums[url]['post_url']
+        except:
+            pass
     try:
     #if True:
         feed = feedparser.parse(url)
@@ -141,8 +149,7 @@ def examine_generic_website(soup, url, md5):
         last_update = time.time()
     return md5, post_title, post_url, last_update
 
-def examine_url(url):
-    logger.debug(url)
+def get_default_values(url):
     # initialize variables, suitable for new urls
     (md5, post_title, post_url, last_update) = ['', '', '', 0]
     if url in md5_sums:
@@ -153,6 +160,11 @@ def examine_url(url):
             post_url = md5_sums[url]['post_url']
         except:
             pass
+    return(md5, post_title, post_url, last_update)
+
+def examine_url(url):
+    logger.debug(url)
+    (md5, post_title, post_url, last_update) = get_default_values(url)
     try:
         response = requests.get(url)
         md5 = hashlib.md5(response.content).hexdigest()  # Calculate the MD5 hash