style(listuple): use literals for empty lists/tuples

Author: ankostis

gitdb/db/base.py

@@ -166,7 +166,7 @@ class CompoundDB(ObjectDBR, LazyMixin, CachingDB):
 
     def _set_cache_(self, attr):
         if attr == '_dbs':
-            self._dbs = list()
+            self._dbs = []
         elif attr == '_db_cache':
             self._db_cache = dict()
         else:
@@ -237,7 +237,7 @@ def partial_to_complete_sha_hex(self, partial_hexsha):
         :return: 20 byte binary sha1 from the given less-than-40 byte hexsha (bytes or str)
         :param partial_hexsha: hexsha with less than 40 byte
         :raise AmbiguousObjectName: """
-        databases = list()
+        databases = []
         _databases_recursive(self, databases)
         partial_hexsha = force_text(partial_hexsha)
         len_partial_hexsha = len(partial_hexsha)

gitdb/db/git.py

@@ -43,7 +43,7 @@ def __init__(self, root_path):
 
     def _set_cache_(self, attr):
         if attr == '_dbs' or attr == '_loose_db':
-            self._dbs = list()
+            self._dbs = []
             loose_db = None
             for subpath, dbcls in ((self.packs_dir, self.PackDBCls),
                                    (self.loose_dir, self.LooseDBCls),

gitdb/db/ref.py

@@ -24,7 +24,7 @@ def __init__(self, ref_file):
 
     def _set_cache_(self, attr):
         if attr == '_dbs':
-            self._dbs = list()
+            self._dbs = []
             self._update_dbs_from_ref_file()
         else:
             super(ReferenceDB, self)._set_cache_(attr)
@@ -39,7 +39,7 @@ def _update_dbs_from_ref_file(self):
         # END get db type
 
         # try to get as many as possible, don't fail if some are unavailable
-        ref_paths = list()
+        ref_paths = []
         try:
             with open(self._ref_file, 'r') as f:
                 ref_paths = [l.strip() for l in f]

gitdb/fun.py

@@ -222,7 +222,7 @@ class DeltaChunkList(list):
     latest delta down to the earliest ancestor. This attribute is queryable
     after all processing with is_reversed."""
 
-    __slots__ = tuple()
+    __slots__ = ()
 
     def rbound(self):
         """:return: rightmost extend in bytes, absolute"""
@@ -323,7 +323,7 @@ class TopdownDeltaChunkList(DeltaChunkList):
 
     """Represents a list which is generated by feeding its ancestor streams one by
     one"""
-    __slots__ = tuple()
+    __slots__ = ()
 
     def connect_with_next_base(self, bdcl):
         """Connect this chain with the next level of our base delta chunklist.

gitdb/test/performance/test_stream.py

@@ -48,7 +48,7 @@ class TestObjDBPerformance(TestBigRepoR):
     @with_rw_directory
     def test_large_data_streaming(self, path):
         ldb = LooseObjectDB(path)
-        string_ios = list()         # list of streams we previously created
+        string_ios = []         # list of streams we previously created
 
         # serial mode
         for randomize in range(2):
@@ -85,7 +85,7 @@ def test_large_data_streaming(self, path):
 
             # reading in chunks of 1 MiB
             cs = 512 * 1000
-            chunks = list()
+            chunks = []
             st = time()
             with ldb.stream(sha) as ostream:
                 while True:

gitdb/test/test_pack.py

@@ -149,7 +149,7 @@ def test_pack(self):
     #    because it is being used by another process: 'sss\\index_cc_wll5'
     @with_rw_directory
     def test_pack_entity(self, rw_dir):
-        pack_objs = list()
+        pack_objs = []
         for packinfo, indexinfo in ((self.packfile_v2_1, self.packindexfile_v1),
                                     (self.packfile_v2_2, self.packindexfile_v2),
                                     (self.packfile_v2_3_ascii, self.packindexfile_v2_3_ascii)):

gitdb/util.py

@@ -293,7 +293,7 @@ class LazyMixin(object):
     return the cached value as stored in the Instance's dict or slot.
     """
 
-    __slots__ = tuple()
+    __slots__ = ()
 
     def __getattr__(self, attr):
         """