From 06aaec32e30c541f0b4e4749a0a7ab0a3f8a1379 Mon Sep 17 00:00:00 2001
From: Ben Greiner <code@bnavigator.de>
Date: Tue, 29 Dec 2020 01:56:14 +0100
Subject: [PATCH] Stop testing Python 2.7, 3.5 and scipy 0.19

merging #447, which did not fail in the PR tests, started to fail master after the merge, because `cont2discrete(..., 'impulse')` fails.

Following NEP 29 we could even drop 3.6. But that is still active in distributions like openSUSE Leap 15.x, so I would like to keep that.
---
 .travis.yml | 33 ++++++---------------------------
 1 file changed, 6 insertions(+), 27 deletions(-)

diff --git a/.travis.yml b/.travis.yml
index ec615501d..22bc99e10 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,9 +13,11 @@ cache:
     - $HOME/.local
 
 python:
+  - "3.9"
+  - "3.8"
   - "3.7"
   - "3.6"
-  - "2.7"
+
 
 # Test against multiple version of SciPy, with and without slycot
 #
@@ -26,18 +28,11 @@ python:
 env:
   - SCIPY=scipy SLYCOT=conda       # default, with slycot via conda
   - SCIPY=scipy SLYCOT=            # default, w/out slycot
-  - SCIPY="scipy==0.19.1" SLYCOT=  # legacy support, w/out slycot
 
 # Add optional builds that test against latest version of slycot, python
 jobs:
   include:
-    - name: "linux, Python 2.7, slycot=source"
-      os: linux
-      dist: xenial
-      services: xvfb
-      python: "2.7"
-      env: SCIPY=scipy SLYCOT=source
-    - name: "linux, Python 3.7, slycot=source"
+    - name: "linux, Python 3.8, slycot=source"
       os: linux
       dist: xenial
       services: xvfb
@@ -49,31 +44,15 @@ jobs:
       services: xvfb
       python: "3.8"
       env: SCIPY=scipy SLYCOT=source
-    - name: "use numpy matrix"
-      dist: xenial
-      services: xvfb
-      python: "3.8"
-      env: SCIPY=scipy SLYCOT=source PYTHON_CONTROL_STATESPACE_ARRAY=1
-
-  # Exclude combinations that are very unlikely (and don't work)
-  exclude:
-    - python: "3.7"            # python3.7 should use latest scipy
-      env: SCIPY="scipy==0.19.1" SLYCOT=
 
   allow_failures:
-    - name: "linux, Python 2.7, slycot=source"
-      os: linux
-      dist: xenial
-      services: xvfb
-      python: "2.7"
-      env: SCIPY=scipy SLYCOT=source
-    - name: "linux, Python 3.7, slycot=source"
+    - name: "linux, Python 3.9, slycot=source"
       os: linux
       dist: xenial
       services: xvfb
       python: "3.7"
       env: SCIPY=scipy SLYCOT=source
-    - name: "linux, Python 3.8, slycot=source"
+    - name: "linux, Python 3.9, slycot=source"
       os: linux
       dist: xenial
       services: xvfb