Avoid unnecessary calls to stats.percentileofscore

[leoluecken]

This is not a main bottleneck, but a simple fix should improve the part in thresholds.py

Here's the diff - sorry for inconvenience :)

diff --git a/thresholds.py b/thresholds.py
index 739d869..1524e69 100644
--- a/thresholds.py
+++ b/thresholds.py
@@ -24,13 +24,8 @@ class Threshold(Enum):
         """Returns a list of ScoredPosts that meet this Threshold with the given Scorer"""

         all_post_scores = [p.get_score(scorer) for p in posts]
-        threshold_posts = [
-            p
-            for p in posts
-            if stats.percentileofscore(all_post_scores, p.get_score(scorer))
-            >= self.value
-        ]
-
+        q = stats.scoreatpercentile(all_post_scores, per=self.value)
+        threshold_posts = [p for p, s in zip(posts, all_post_scores) if s >= q]
         return threshold_posts