add github actions, bail on asyncio patch for tornado 6.1

.github/workflows/ci.yml

@@ -0,0 +1,65 @@
+name: ipykernel tests
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu, macos, windows]
+        python-version: [ '3.6', '3.7', '3.8', '3.9', 'pypy3' ]
+        exclude:
+        - os: windows
+          python-version: pypy3
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v1
+    - name: Install Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v1
+      with:
+        python-version: ${{ matrix.python-version }}
+        architecture: 'x64'
+    - name: Upgrade packaging dependencies
+      run: |
+        pip install --upgrade pip setuptools wheel --user
+    - name: Get pip cache dir
+      id: pip-cache
+      run: |
+        echo "::set-output name=dir::$(pip cache dir)"
+    - name: Cache pip
+      uses: actions/cache@v1
+      with:
+        path: ${{ steps.pip-cache.outputs.dir }}
+        key: ${{ runner.os }}-pip-${{ matrix.python-version }}-${{ hashFiles('setup.py') }}
+        restore-keys: |
+          ${{ runner.os }}-pip-${{ matrix.python-version }}-
+          ${{ runner.os }}-pip-
+    - name: Install the Python dependencies
+      run: |
+        pip install --pre --upgrade --upgrade-strategy=eager .[test] codecov
+    - name: Install matplotlib
+      if: ${{ matrix.os != 'macos' && matrix.python-version != 'pypy3' }}
+      run: |
+        pip install matplotlib || echo 'failed to install matplolib'
+    - name: Install alternate event loops
+      if: ${{ matrix.os != 'windows' }}
+      run: |
+        pip install curio || echo 'ignoring curio install failure'
+        pip install trio || echo 'ignoring trio install failure'
+    - name: List installed packages
+      run: |
+        pip freeze
+        pip check
+    - name: Run the tests
+      timeout-minutes: 30
+      run: |
+        pytest ipykernel -vv -s --cov ipykernel --cov-branch --cov-report term-missing:skip-covered --durations 10
+    - name: Coverage
+      run: |
+        codecov

examples/embedding/inprocess_qtconsole.py

@@ -1,6 +1,8 @@
 import os
 import sys
 
+import tornado
+
 from qtconsole.rich_ipython_widget import RichIPythonWidget
 from qtconsole.inprocess import QtInProcessKernelManager
 from IPython.lib import guisupport
@@ -21,7 +23,7 @@ def init_asyncio_patch():
     FIXME: if/when tornado supports the defaults in asyncio,
            remove and bump tornado requirement for py38
     """
-    if sys.platform.startswith("win") and sys.version_info >= (3, 8):
+    if sys.platform.startswith("win") and sys.version_info >= (3, 8) and tornado.version_info < (6, 1):
         import asyncio
         try:
             from asyncio import (

examples/embedding/inprocess_terminal.py

@@ -1,6 +1,8 @@
 import os
 import sys
 
+import tornado
+
 from ipykernel.inprocess import InProcessKernelManager
 from jupyter_console.ptshell import ZMQTerminalInteractiveShell
 
@@ -20,7 +22,7 @@ def init_asyncio_patch():
     FIXME: if/when tornado supports the defaults in asyncio,
            remove and bump tornado requirement for py38
     """
-    if sys.platform.startswith("win") and sys.version_info >= (3, 8):
+    if sys.platform.startswith("win") and sys.version_info >= (3, 8) and tornado.version_info < (6, 1):
         import asyncio
         try:
             from asyncio import (

ipykernel/inprocess/tests/test_kernel.py

@@ -5,6 +5,10 @@
 import sys
 import unittest
 
+import pytest
+
+import tornado
+
 from ipykernel.inprocess.blocking import BlockingInProcessKernelClient
 from ipykernel.inprocess.manager import InProcessKernelManager
 from ipykernel.inprocess.ipkernel import InProcessKernel
@@ -29,7 +33,7 @@ def _init_asyncio_patch():
     FIXME: if/when tornado supports the defaults in asyncio,
            remove and bump tornado requirement for py38
     """
-    if sys.platform.startswith("win") and sys.version_info >= (3, 8):
+    if sys.platform.startswith("win") and sys.version_info >= (3, 8) and tornado.version_info < (6, 1):
         import asyncio
         try:
             from asyncio import (
@@ -76,6 +80,10 @@ def test_raw_input(self):
             sys.stdin = sys_stdin
         assert self.km.kernel.shell.user_ns.get('x') == 'foobar'
 
+    @pytest.mark.skipif(
+        '__pypy__' in sys.builtin_module_names,
+        reason="fails on pypy"
+    )
     def test_stdout(self):
         """ Does the in-process kernel correctly capture IO?
         """

ipykernel/kernelapp.py

@@ -11,7 +11,9 @@
 import traceback
 import logging
 
+import tornado
 from tornado import ioloop
+
 import zmq
 from zmq.eventloop import ioloop as zmq_ioloop
 from zmq.eventloop.zmqstream import ZMQStream
@@ -521,7 +523,7 @@ def _init_asyncio_patch(self):
         FIXME: if/when tornado supports the defaults in asyncio,
                remove and bump tornado requirement for py38
         """
-        if sys.platform.startswith("win") and sys.version_info >= (3, 8):
+        if sys.platform.startswith("win") and sys.version_info >= (3, 8) and tornado.version_info < (6, 1):
             import asyncio
             try:
                 from asyncio import (
@@ -539,7 +541,7 @@ def _init_asyncio_patch(self):
 
     def init_pdb(self):
         """Replace pdb with IPython's version that is interruptible.
-        
+
         With the non-interruptible version, stopping pdb() locks up the kernel in a
         non-recoverable state.
         """

ipykernel/tests/test_kernel.py

@@ -78,7 +78,10 @@ def test_sys_path_profile_dir():
 
 
 @flaky(max_runs=3)
-@dec.skipif(sys.platform == 'win32', "subprocess prints fail on Windows")
+@dec.skipif(
+    sys.platform == 'win32' or (sys.platform == "darwin" and sys.version_info >=(3, 8)),
+    "subprocess prints fail on Windows and MacOS Python 3.8+"
+)
 def test_subprocess_print():
     """printing from forked mp.Process"""
     with new_kernel() as kc:
@@ -130,7 +133,10 @@ def test_subprocess_noprint():
 
 
 @flaky(max_runs=3)
-@dec.skipif(sys.platform == 'win32', "subprocess prints fail on Windows")
+@dec.skipif(
+    sys.platform == 'win32' or (sys.platform == "darwin" and sys.version_info >=(3, 8)),
+    "subprocess prints fail on Windows and MacOS Python 3.8+"
+)
 def test_subprocess_error():
     """error in mp.Process doesn't crash"""
     with new_kernel() as kc:
@@ -297,7 +303,7 @@ def test_message_order():
             assert reply['parent_header']['msg_id'] == msg_id
 
 
-@dec.skipif(sys.platform.startswith('linux'))
+@dec.skipif(sys.platform.startswith('linux') or sys.platform.startswith('darwin'))
 def test_unc_paths():
     with kernel() as kc, TemporaryDirectory() as td:
         drive_file_path = os.path.join(td, 'unc.txt')
@@ -345,7 +351,7 @@ def test_shutdown():
 def test_interrupt_during_input():
     """
     The kernel exits after being interrupted while waiting in input().
-    
+
     input() appears to have issues other functions don't, and it needs to be
     interruptible in order for pdb to be interruptible.
     """
@@ -384,4 +390,4 @@ def test_interrupt_during_pdb_set_trace():
         reply = kc.get_shell_msg(timeout=TIMEOUT)
         validate_message(reply, 'execute_reply', msg_id)
         reply = kc.get_shell_msg(timeout=TIMEOUT)
-        validate_message(reply, 'execute_reply', msg_id2)
+        validate_message(reply, 'execute_reply', msg_id2)