refactoring: Drop PY2 and PY3 flags

tests/test_quickstart.py

@@ -13,7 +13,7 @@ import sys
 import time
 
 import pytest
-from six import PY2, text_type, StringIO
+from six import text_type, StringIO
 from six.moves import input
 
 from sphinx import application
@@ -37,12 +37,7 @@ def mock_input(answers, needanswer=False):
             raise AssertionError('answer for %r missing and no default '
                                  'present' % prompt)
         called.add(prompt)
-        if PY2:
-            prompt = str(prompt)  # Python2.x raw_input emulation
-            # `raw_input` encode `prompt` by default encoding to print.
-        else:
-            prompt = text_type(prompt)  # Python3.x input emulation
-            # `input` decode prompt by default encoding before print.
+        prompt = text_type(prompt)
         for question in answers:
             if prompt.startswith(qs.PROMPT_PREFIX + question):
                 return answers[question]