python3: top-level repo fileadjustments: setup, travis, dev.sh

- Add a dev.sh script that sets up a development virtualenv
- Adjust travis.yml to use Xenial
- Adjust setup.py

.travis.yml

@@ -1,5 +1,5 @@
 sudo: false
-dist: trusty
+dist: xenial
 language: python
 
 matrix:

dev.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+set -e
+set -x
+
+echo "Creating dev environment in ./venv..."
+
+python3.7 -m venv venv
+. venv/bin/activate
+pip3.7 install -U pip setuptools
+pip3.7 install -r requirements.txt
+pip3.7 install -r requirements-dev.txt
+
+echo ""
+echo "  * Created virtualenv environment in ./venv."
+echo "  * Installed all dependencies into the virtualenv."
+echo "  * You can now activate the $(python3 --version) virtualenv with this command: \`. venv/bin/activate\`"

setup.cfg

@@ -13,7 +13,7 @@ ignore =
 
 [mypy]
 mypy_path = stubs
-python_version = 2.7
+python_version = 3.6
 [mypy-_cffi_backend]
 ignore_missing_imports = True
 [mypy-cairocffi._ffi]

setup.py

@@ -100,13 +100,9 @@ setup(
         "License :: OSI Approved :: MIT License",
         "Development Status :: 3 - Alpha",
         "Programming Language :: Python",
-        "Programming Language :: Python :: 2.7",
-        "Programming Language :: Python :: 3.4",
-        "Programming Language :: Python :: 3.5",
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: Implementation :: CPython",
-        "Programming Language :: Python :: Implementation :: PyPy",
         "Operating System :: Unix",
         "Topic :: Desktop Environment :: Window Managers",
     ],
@@ -120,9 +116,6 @@ setup(
     install_requires=dependencies,
     setup_requires=dependencies,
     extras_require={
-        ':python_version=="2.7"': [
-            'trollius',
-        ],
         'ipython': ["ipykernel", "jupyter_console"],
     },
     packages=['libqtile',