Merge pull request #6 from TomasHubelbauer/patch-1

Check for Python 3 at runtime and at README.md-time :-)

README.md

@@ -1,8 +1,13 @@
 # youtube-dl-subscriptions
 Downloads all new videos from your YouTube subscription feeds.
 
+Requires Python 3 to run!
+
 I recommend to create a new folder and place the dl.py inside. You will also need a OPML file named subs.xml containing all your YouTube's subscriptions in the same folder. You can download it from https://www.youtube.com/subscription_manager?action_takeout=1 when you're logged in your YouTube account. The script will create a last.txt file inside the folder in order to remember when it was last run and not re-download the same videos again.
 
+Requirements:
+* Python 3
+
 Dependencies:
 * opml
 * feedparser

dl.py

@@ -1,9 +1,13 @@
 import opml
 import feedparser
 import youtube_dl
+import sys
 from glob import glob
 from pprint import pprint
 
+if sys.version_info[0] < 3:
+    raise Exception('Must be using Python 3')
+
 from time import time, mktime, strptime
 from datetime import datetime