Add tox support for six-less environments

1 files changed, 6 insertions, 6 deletions

diff --git a/tox.ini b/tox.ini
index 0e5d5a5a..5379d136 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py35, py36, py37, py38, py39, pypy, pylint
+envlist = py{36,37,38,39}, py{36,37,38,39}-six, pylint
 skip_missing_interpreters = true
 
 [testenv:pylint]
@@ -18,13 +18,13 @@ deps =
   ; we have a brain for nose
   ; we use pytest for tests
   nose
-  py35,py36,py37,py38,py39: numpy
-  py35,py36,py37,py38,py39: attr
-  py35,py36,py37,py38,py39: typed_ast>=1.4.0,<1.5
+  py{35,36,37,38,39}: numpy
+  py{35,36,37,38,39}: attrs
+  py{35,36,37,38,39}: typed_ast>=1.4.0,<1.5
   pytest
-  python-dateutil
+  !py{35,36,37,38,39}-six: python-dateutil
   pypy: singledispatch
-  six~=1.12
+  six: six
   wrapt>=1.11,<1.13
   coverage<5