feat(src): subst `reduce` with `sum` for size calcs

+ fix(loose-db): fix bad-attr in ex-message

3 files changed, 3 insertions, 6 deletions

diff --git a/gitdb/db/base.py b/gitdb/db/base.py
index 2d7b9fa..6dbee21 100644
--- a/gitdb/db/base.py
+++ b/gitdb/db/base.py
@@ -16,7 +16,6 @@ from gitdb.exc import (
 )
 
 from itertools import chain
-from functools import reduce
 
 
 __all__ = ('ObjectDBR', 'ObjectDBW', 'FileDBBase', 'CompoundDB', 'CachingDB')
@@ -209,7 +208,7 @@ class CompoundDB(ObjectDBR, LazyMixin, CachingDB):
 
     def size(self):
         """:return: total size of all contained databases"""
-        return reduce(lambda x, y: x + y, (db.size() for db in self._dbs), 0)
+        return sum(db.size() for db in self._dbs)
 
     def sha_iter(self):
         return chain(*(db.sha_iter() for db in self._dbs))
diff --git a/gitdb/db/loose.py b/gitdb/db/loose.py
index 192c524..374cdc7 100644
--- a/gitdb/db/loose.py
+++ b/gitdb/db/loose.py
@@ -57,7 +57,7 @@ import tempfile
 import os
 
 
-__all__ = ('LooseObjectDB', )
+__all__ = ('LooseObjectDB',)
 
 
 class LooseObjectDB(FileDBBase, ObjectDBR, ObjectDBW):
@@ -150,7 +150,7 @@ class LooseObjectDB(FileDBBase, ObjectDBR, ObjectDBW):
     def set_ostream(self, stream):
         """:raise TypeError: if the stream does not support the Sha1Writer interface"""
         if stream is not None and not isinstance(stream, Sha1Writer):
-            raise TypeError("Output stream musst support the %s interface" % Sha1Writer.__name__)
+            raise TypeError("Output stream must support the %s interface" % Sha1Writer)
         return super(LooseObjectDB, self).set_ostream(stream)
 
     def info(self, sha):
diff --git a/gitdb/db/pack.py b/gitdb/db/pack.py
index 6b03d83..12ec43a 100644
--- a/gitdb/db/pack.py
+++ b/gitdb/db/pack.py
@@ -20,8 +20,6 @@ from gitdb.exc import (
 from gitdb.pack import PackEntity
 from gitdb.utils.compat import xrange
 
-from functools import reduce
-
 import os
 import glob