Convert to Python 3: `reduce()` -> `functools.reduce()`

sznqalibs/hoover.py

 # coding=utf-8
 
 import collections
+import functools
 import csv
 import difflib
 import hashlib
     tracker = Tracker()
     last_argset = None
 
-    all_classes = set(reduce(lambda a, b: a+b,
-                             [triple[1:] for triple in tests]))
+    all_classes = set(functools.reduce(
+        lambda a, b: a+b,
+        [triple[1:] for triple in tests]
+    ))
 
     counter = StatCounter()
 
         """
 
         def total_errors():
-            return reduce(lambda x, y: x + len(y), self._db.values(), 0)
+            return functools.reduce(
+                lambda x, y: x + len(y),
+                self._db.values(),
+                initial=0,
+            )
 
         stats = {
             "argsets": self.argsets_done,