Minor optimization for process.extract

[giampaolo]

diff --git a/fuzzywuzzy/process.py b/fuzzywuzzy/process.py
index f31dbe8..9fa4e97 100644
--- a/fuzzywuzzy/process.py
+++ b/fuzzywuzzy/process.py
@@ -96,6 +96,8 @@ def extract(query, choices, processor=None, scorer=None, limit=5):
         scorer = fuzz.WRatio

     sl = []
+    # localize variable access to minimize overhead
+    sl_append = sl.append

     try:
         # See if choices is a dictionary-like object.
@@ -108,7 +110,7 @@ def extract(query, choices, processor=None, scorer=None, limit=5):
         for choice in choices:
             processed = processor(choice)
             score = scorer(query, processed)
-            sl.append((choice, score))
+            sl_append((choice, score))

     sl.sort(key=lambda i: i[1], reverse=True)
     return sl[:limit]

This will save some CPU cycles in case the input choice has many elements.

[josegonzalez]

Mind making a pr for this?