Add skip_missing_interpreters to tox.ini.dont-be-pretentious

This way users will not be penalized if they do not have all python
versions installed.

The docs are updated to suggest just calling tox with no arguments.

3 files changed, 14 insertions, 22 deletions

diff --git a/README.rst b/README.rst
index 9c71a4f..783d109 100644
--- a/README.rst
+++ b/README.rst
@@ -305,22 +305,16 @@ How to Run Tests
 Please note that ``natsort`` is NOT set-up to support ``python setup.py test``.
 
 The recommended way to run tests is with `tox <https://tox.readthedocs.io/en/latest/>`_.
-Suppose you want to run tests for Python 3.6 - you can run tests by simply executing the
-following:
+After installing ``tox``, running tests is as simple as executing the following in the
+``natsort`` directory:
 
 .. code-block:: sh
 
-    $ tox -e py36
+    $ tox
 
 ``tox`` will create virtual a virtual environment for your tests and install all the
-needed testing requirements for you.
-
-If you want to run testing on all of Python 2.7, 3.4, 3.5, and 3.6 you can simply
-execute
-
-.. code-block:: sh
-
-    $ tox
+needed testing requirements for you.  You can specify a particular python version
+with the ``-e`` flag, e.g. ``tox -e py36``.
 
 If you do not wish to use ``tox``, you can install the testing dependencies and run the
 tests manually using `pytest <https://docs.pytest.org/en/latest/>`_ - ``natsort``
diff --git a/docs/source/intro.rst b/docs/source/intro.rst
index 790234b..40aaad3 100644
--- a/docs/source/intro.rst
+++ b/docs/source/intro.rst
@@ -308,22 +308,16 @@ How to Run Tests
 Please note that :mod:`natsort` is NOT set-up to support ``python setup.py test``.
 
 The recommended way to run tests is with `tox <https://tox.readthedocs.io/en/latest/>`_.
-Suppose you want to run tests for Python 3.6 - you can run tests by simply executing the
-following:
+After installing ``tox``, running tests is as simple as executing the following in the
+``natsort`` directory:
 
 .. code-block:: sh
 
-    $ tox -e py36
+    $ tox
 
 ``tox`` will create virtual a virtual environment for your tests and install all the
-needed testing requirements for you.
-
-If you want to run testing on all of Python 2.7, 3.4, 3.5, and 3.6 you can simply
-execute
-
-.. code-block:: sh
-
-    $ tox
+needed testing requirements for you.  You can specify a particular python version
+with the ``-e`` flag, e.g. ``tox -e py36``.
 
 If you do not wish to use ``tox``, you can install the testing dependencies and run the
 tests manually using `pytest <https://docs.pytest.org/en/latest/>`_ - ``natsort``
diff --git a/tox.ini b/tox.ini
index fc39d31..55ff47b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -10,6 +10,10 @@ envlist =
 #   docs
 #   release
 
+# Don't error out if a user hasn't installed all python versions.
+skip_missing_interpreters =
+    true
+
 [testenv]
 passenv =
     WITH_EXTRAS