Add support for Python 3.7. (#117)

* Additionally test PyPy3 on TravisCI.
* Handle additional `context` argument of Python 3.7 gracefully.

Fixes #116.

.bzrignore

-.installed.cfg
-bin
-build
-develop-eggs
-eggs
-parts
-*.egg-info

.travis.yml

 language: python
-sudo: false
 matrix:
     include:
         - os: linux
@@ -18,6 +17,20 @@ matrix:
         - os: linux
           python: 3.6
           env: ZEO_MSGPACK=1 ZEO_MTACCEPTOR=1
+        - os: linux
+          python: 3.7
+          env: ZEO_MTACCEPTOR=1
+          dist: xenial
+        - os: linux
+          python: 3.7
+          env: ZEO_MSGPACK=1 ZEO_MTACCEPTOR=1
+          dist: xenial
+        - os: linux
+          python: pypy3
+          env: ZEO_MTACCEPTOR=1
+        - os: linux
+          python: pypy3
+          env: ZEO_MSGPACK=1 ZEO_MTACCEPTOR=1
         - os: linux
           python: 2.7
           env: ZEO_MSGPACK=1
@@ -37,6 +50,6 @@ cache:
   directories:
     - eggs
 script:
-    - bin/test -vv -j99
+    - bin/test -vv -j3
 notifications:
     email: false

CHANGES.rst

@@ -4,7 +4,7 @@ Changelog
 5.2.1 (unreleased)
 ------------------
 
-- Nothing changed yet.
+- Add support for Python 3.7.
 
 
 5.2.0 (2018-03-28)

setup.py

@@ -47,6 +47,8 @@ Programming Language :: Python :: 2.7
 Programming Language :: Python :: 3
 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
 Topic :: Database

src/ZEO/asyncio/testing.py

@@ -24,7 +24,10 @@ class Loop(object):
         self.later = []
         self.exceptions = []
 
-    def call_soon(self, func, *args):
+    def call_soon(self, func, *args, **kw):
+        # Python 3.7+ calls us with a `context` keyword-only argument:
+        kw.pop('context', None)
+        assert not kw
         func(*args)
 
     def _connect(self, future, protocol_factory):

tox.ini

 [tox]
 envlist =
-    py27,py34,py35,simple
+    py27,py34,py35,py36,py37,pypy,pypy3,simple
 
 [testenv]
 commands =