Fix py2_str flag for python 2 compatibility mode (usage in standard repr call)

Signed-off-by: Alexey Stepanov <penguinolog@gmail.com>

Author: penguinolog

logwrap/_repr_utils.py

@@ -172,7 +172,7 @@ def __init__(
         self.__keyword = keyword
         self.__max_indent = max_indent
         self.__indent_step = indent_step
-        self.__py2_str = py2_str
+        self.__py2_str = py2_str and not _PY3  # Python 2 only behavior
 
     @property
     def max_indent(self):

test/test_repr_utils.py

@@ -347,3 +347,6 @@ def __pretty_repr__(
             result,
             "u'''<Test Class at 0x{:X}>'''".format(id(Tst))
         )
+
+    def test_py2_compatibility_flag(self):
+        self.assertIsInstance(logwrap.pretty_repr(u'Text', py2_str=True), str)