Add Python 3.7 compatibility (spotify#2466)

* Add tox python 3.7

* Mimic travis 3.6 setup for 3.7-dev to check for support

* Update travis to 3.7 (not dev) which currently requires xenial os distro

* Add explicit postgresql service to Travis

* Update 3.7 builds to override dist and sudo

* Add py37 to README support

* Update package classifiers for supported Python versions

* Remove python 3.4 and 3.5 from TravisCI testing

* Update readme python version support for tested versions

.travis.yml

@@ -1,9 +1,12 @@
 language: python
 
+dist: xenial
+
 services:
   - elasticsearch
   - mysql
   - docker
+  - postgresql
 
 env:
   global:
@@ -22,7 +25,6 @@ env:
     - TOXENV=flake8
     - TOXENV=docs
     - TOXENV=py27-nonhdfs
-    - TOXENV=py34-nonhdfs
     - TOXENV=py27-unixsocket
       # - TOXENV=py27-cdh
       # minicluster (cdh) tests disabled as lack of love, #2140.
@@ -33,18 +35,25 @@ env:
       # - TOXENV=visualiser
       # Disabling this test because of intermittent failures :-/
 
-# Python 3.5 has to go here until Travis adds it to the default build images.
-# https://github.com/travis-ci/travis-ci/issues/4794#issuecomment-143758799
+sudo: false
+
+# Python 3.7 needs to have its dist/sudo flags set in matrix so they don't
+# break the other python builds.
+# https://github.com/travis-ci/travis-ci/issues/9815
 matrix:
   include:
-    - python: 3.5
-      env: TOXENV=py35-nonhdfs
     - python: 3.6
       env: TOXENV=py36-nonhdfs
     - python: 3.6
       env: TOXENV=py36-unixsocket
-
-sudo: false
+    - python: 3.7
+      dist: xenial
+      sudo: true
+      env: TOXENV=py37-nonhdfs
+    - python: 3.7
+      dist: xenial
+      sudo: true
+      env: TOXENV=py37-unixsocket
 
 cache:
   directories:

README.rst

@@ -17,7 +17,7 @@
 .. image:: https://img.shields.io/pypi/l/luigi.svg?style=flat
    :target: https://pypi.python.org/pypi/luigi
 
-Luigi is a Python (2.7, 3.3, 3.4, 3.5, 3.6) package that helps you build complex
+Luigi is a Python (2.7, 3.6, 3.7 tested) package that helps you build complex
 pipelines of batch jobs. It handles dependency resolution, workflow management,
 visualization, handling failures, command line integration, and much more.
 

setup.py

@@ -95,6 +95,8 @@ def get_static_files(path):
         'Programming Language :: Python :: 3.3',
         'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
+        'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: 3.7',
         'Topic :: System :: Monitoring',
     ],
 )

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py{27,33,34,35,36}-{cdh,hdp,nonhdfs,gcloud,postgres,unixsocket}, visualiser, pypy-scheduler, docs, flake8
+envlist = py{27,33,34,35,36,37}-{cdh,hdp,nonhdfs,gcloud,postgres,unixsocket}, visualiser, pypy-scheduler, docs, flake8
 skipsdist = True
 
 [testenv]