fix tox python3 overrides

We want to default to running all tox environments under python 3, so
set the basepython value in each environment.

We do not want to specify a minor version number, because we do not
want to have to update the file every time we upgrade python.

We do not want to set the override once in testenv, because that
breaks the more specific versions used in default environments like
py35 and py36.

Change-Id: Ie039ae0a75fe13471051d0be7dfbf0bd73088b5a
Signed-off-by: Doug Hellmann <doug@doughellmann.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/tox.ini b/tox.ini
index 9e60b20..dd2ab9b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,5 +4,6 @@ skipsdist = True
 envlist = py27,py33,py34
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}