reduce extra code for python 2 compatibility

Author: Changaco

tests/test_entry.py

@@ -7,14 +7,15 @@
 import locale
 from os import environ, stat
 from os.path import join
-import sys
 import unicodedata
 
 from libarchive import memory_reader, memory_writer
 
 from . import data_dir, get_entries, get_tarinfos
 
 
+text_type = unicode if str is bytes else str  # noqa: F821
+
 locale.setlocale(locale.LC_ALL, '')
 
 # needed for sane time stamp comparison
@@ -98,10 +99,6 @@ def check_entries(test_file, regen=False, ignore=''):
         # Normalize all unicode (can vary depending on the system)
         for d in (e1, e2):
             for key in d:
-                if sys.version_info[0] < 3:
-                    IS_UNICODE = isinstance(d[key], unicode)  # noqa: F821
-                else:
-                    IS_UNICODE = isinstance(d[key], str)
-                if IS_UNICODE:
+                if isinstance(d[key], text_type):
                     d[key] = unicodedata.normalize('NFC', d[key])
         assert e1 == e2