Skip test_subparser_aliases on Python 2

Author: jimporter

tests/test_shtab.py

@@ -3,6 +3,7 @@
 """
 import logging
 import subprocess
+import sys
 from argparse import ArgumentParser
 
 import pytest
@@ -195,6 +196,7 @@ def test_subparser_custom_complete(shell, caplog):
 
 
 @fix_shell
+@pytest.mark.skipif(sys.version_info[0] == 2, reason="requires Python 3.x")
 def test_subparser_aliases(shell, caplog):
     parser = ArgumentParser(prog="test")
     subparsers = parser.add_subparsers()