Apply Black style, isort

.github/workflows/main.yml

@@ -29,8 +29,12 @@ jobs:
     - name: Install dependencies
       run: |
         pip install --upgrade setuptools pip
-        pip install --upgrade --upgrade-strategy eager -e .[test] pytest-cov codecov 'coverage<5'
+        pip install --upgrade --upgrade-strategy eager -e .[test] pytest-cov codecov 'coverage<5' black isort
         pip freeze
+    - name: Check style
+      run: |
+        black jupyter_client --check --line-length 100
+        isort jupyter_client --check --profile black
     - name: Check types
       run: mypy jupyter_client/manager.py jupyter_client/multikernelmanager.py jupyter_client/client.py jupyter_client/blocking/client.py jupyter_client/asynchronous/client.py jupyter_client/channels.py jupyter_client/session.py jupyter_client/adapter.py jupyter_client/connect.py jupyter_client/consoleapp.py jupyter_client/jsonutil.py jupyter_client/kernelapp.py jupyter_client/launcher.py
     - name: Run the tests

README.md

@@ -2,7 +2,7 @@
 
 [![Build Status](https://github.com/jupyter/jupyter_client/workflows/CI/badge.svg)](https://github.com/jupyter/jupyter_client/actions)
 [![Code Health](https://landscape.io/github/jupyter/jupyter_client/master/landscape.svg?style=flat)](https://landscape.io/github/jupyter/jupyter_client/master)
-
+[![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
 
 `jupyter_client` contains the reference implementation of the [Jupyter protocol][].
 It also provides client and kernel management APIs for working with kernels.

jupyter_client/__init__.py

@@ -1,10 +1,10 @@
 """Client-side implementations of the Jupyter protocol"""
 
-from ._version import version_info, __version__, protocol_version_info, protocol_version
+from ._version import __version__, protocol_version, protocol_version_info, version_info
+from .asynchronous import AsyncKernelClient
+from .blocking import BlockingKernelClient
+from .client import KernelClient
 from .connect import *
 from .launcher import *
-from .client import KernelClient
-from .manager import KernelManager, AsyncKernelManager, run_kernel
-from .blocking import BlockingKernelClient
-from .asynchronous import AsyncKernelClient
-from .multikernelmanager import MultiKernelManager, AsyncMultiKernelManager
+from .manager import AsyncKernelManager, KernelManager, run_kernel
+from .multikernelmanager import AsyncMultiKernelManager, MultiKernelManager