disable xonsh on python3.9

xonsh/xonsh#3618

Signed-off-by: Bernat Gabor <bgabor8@bloomberg.net>

setup.cfg

@@ -61,7 +61,7 @@ virtualenv.activate =
  batch = virtualenv.activation.batch:BatchActivator
  fish = virtualenv.activation.fish:FishActivator
  powershell = virtualenv.activation.powershell:PowerShellActivator
- python = virtualenv.activation.python:PythonActivator
+ python = virtualenv.activation.python:PestythonActivator
  xonsh = virtualenv.activation.xonsh:XonshActivator
 virtualenv.create =
  venv = virtualenv.create.via_global_ref.venv:Venv
@@ -99,7 +99,7 @@ testing =
  pytest-randomly >= 1
  pytest-timeout >= 1
  flaky >= 3
- xonsh >= 0.9.16; python_version > '3.4'
+ xonsh >= 0.9.16; python_version > '3.4' and python_version != '3.9'
 
 [options.package_data]
 virtualenv.activation.bash = *.sh

tests/unit/activation/test_xonsh.py

@@ -9,9 +9,9 @@
 
 
 @pytest.mark.slow
-@pytest.mark.skipif(sys.platform == "win32" and IS_PYPY and PY3, reason="xonsh on Windows blocks indefinitely")
-@pytest.mark.xfail(
- condition=sys.version_info[0:2] == (3, 9), strict=True, reason="https://bugs.python.org/issue40726",
+@pytest.mark.skipif(
+ (sys.platform == "win32" and IS_PYPY and PY3) or sys.version_info[0:2] == (3, 9),
+ reason="xonsh on Windows blocks indefinitely and is not stable yet on 3.9",
 )
 def test_xonsh(activation_tester_class, activation_tester):
  class Xonsh(activation_tester_class):