Install format and lint tools

.gitignore

 .vscode
 __pycache__
+.venv/
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requirements-dev.in

+black
+flake8
+mypy
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requirements-dev.txt

+#
+# This file is autogenerated by pip-compile
+# To update, run:
+#
+#    pip-compile requirements-dev.in
+#
+appdirs==1.4.4
+    # via black
+black==20.8b1
+    # via -r requirements-dev.in
+click==7.1.2
+    # via black
+flake8==3.8.4
+    # via -r requirements-dev.in
+mccabe==0.6.1
+    # via flake8
+mypy-extensions==0.4.3
+    # via
+    #   black
+    #   mypy
+mypy==0.812
+    # via -r requirements-dev.in
+pathspec==0.8.1
+    # via black
+pycodestyle==2.6.0
+    # via flake8
+pyflakes==2.2.0
+    # via flake8
+regex==2020.11.13
+    # via black
+toml==0.10.2
+    # via black
+typed-ast==1.4.2
+    # via
+    #   black
+    #   mypy
+typing-extensions==3.7.4.3
+    # via
+    #   black
+    #   mypy

setup.cfg

+[flake8]
+# Recommend matching the black line length (default 88),
+# rather than using the flake8 default of 79:
+max-line-length = 88
+exclude=.venv
+extend-ignore =
+    # See https://github.com/PyCQA/pycodestyle/issues/373
+    E203,
+enable-extensions=G # for flake8-logging-format
+
+[tool:pytest]
+addopts = --doctest-modules
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