Updated Ch4 to Python3, updated reddit example

Author: mmargenot

Chapter4_TheGreatestTheoremNeverTold/Chapter4.ipynb

@@ -0,0 +1,53 @@
+import sys
+
+import numpy as np
+from IPython.core.display import Image
+
+import praw
+
+
+reddit = praw.Reddit("BayesianMethodsForHackers")
+subreddit  = reddit.get_subreddit( "crazyideas" )
+
+top_submissions = subreddit.get_top(limit=100)
+
+n_sub = int( sys.argv[1] ) if sys.argv[1] else 1
+
+i = 0
+while i < n_sub:
+    top_submission = next(top_submissions)
+    #while "i.imgur.com" not in top_submission.url:
+    #    #make sure it is linking to an image, not a webpage.
+    #    top_submission = next(top_submissions)
+    i+=1
+
+#print("Post contents: \n", top_submission.title)
+top_post = top_submission.title
+#top_submission.replace_more_comments(limit=5, threshold=0)
+#print(top_post_url)
+
+upvotes = []
+downvotes = []
+contents = []
+"""_all_comments = top_submission.comments
+all_comments=[]
+for comment in _all_comments:
+            try:
+                #ups = int(round((ratio*comment.score)/(2*ratio - 1)) if ratio != 0.5 else round(comment.score/2))
+                #upvotes.append(ups)
+                #downvotes.append(ups - comment.score)
+                scores.append( comment.score )
+                contents.append( comment.body )
+            except Exception as e:
+                continue
+"""
+for sub in top_submissions:
+    try:
+        ratio = reddit.get_submission(sub.permalink).upvote_ratio
+        ups = int(round((ratio*sub.score)/(2*ratio - 1)) if ratio != 0.5 else round(sub.score/2))
+        upvotes.append(ups)
+        downvotes.append(ups - sub.score)
+        contents.append(sub.title)
+    except Exception as e:
+        continue
+votes = np.array( [ upvotes, downvotes] ).T