Set up requirements.

Install packages to check the code formatting.
Do this before every commit.

.pre-commit-config.yaml

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+repos:
+  - repo: local
+    hooks:
+      - id: isort
+        name: isort
+        stages: [commit]
+        language: system
+        entry: isort
+        types: [python]
+
+      - id: black
+        name: black
+        stages: [commit]
+        language: system
+        entry: black
+        types: [python]
+
+      - id: flake8
+        name: flake8
+        stages: [commit]
+        language: system
+        entry: flake8
+        types: [python]
+        exclude: setup.py
+
+      - id: mypy
+        name: mypy
+        stages: [commit]
+        language: system
+        entry: pipenv run mypy
+        types: [python]
+        pass_filenames: false

config/environment.yml

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+name: straw2analysis
+channels:
+  - conda-forge
+  - defaults
+dependencies:
+  - appdirs=1.4.4=py_0
+  - attrs=20.3.0=pyhd3eb1b0_0
+  - black=19.3b0=py_0
+  - ca-certificates=2020.12.5=h5b45459_0
+  - certifi=2020.12.5=py39hcbf5309_0
+  - cfgv=3.2.0=py_0
+  - click=7.1.2=py_0
+  - distlib=0.3.1=pyh9f0ad1d_0
+  - editdistance=0.5.3=py39h415ef7b_2
+  - filelock=3.0.12=pyh9f0ad1d_0
+  - flake8=3.8.4=py_0
+  - identify=1.5.10=pyhd3deb0d_0
+  - importlib-metadata=2.0.0=py_1
+  - isort=5.6.4=py_0
+  - mccabe=0.6.1=py39haa95532_1
+  - mypy=0.790=py_0
+  - mypy_extensions=0.4.3=py39hcbf5309_2
+  - nodeenv=1.5.0=pyh9f0ad1d_0
+  - openssl=1.1.1i=h8ffe710_0
+  - pip=20.3.3=py39haa95532_0
+  - pre-commit=2.9.3=py39hcbf5309_0
+  - psutil=5.8.0=py39hb82d6ee_0
+  - pycodestyle=2.6.0=py_0
+  - pyflakes=2.2.0=py_0
+  - python=3.9.1=h6244533_2
+  - python_abi=3.9=1_cp39
+  - pyyaml=5.3.1=py39ha3862ff_1
+  - setuptools=51.0.0=py39haa95532_2
+  - six=1.15.0=pyh9f0ad1d_0
+  - sqlite=3.33.0=h2a8f88b_0
+  - toml=0.10.1=py_0
+  - typed-ast=1.4.1=py39hb82d6ee_1
+  - typing_extensions=3.7.4.3=py_0
+  - tzdata=2020d=h14c3975_0
+  - vc=14.2=h21ff451_1
+  - virtualenv=20.2.2=py39hcbf5309_0
+  - vs2015_runtime=14.27.29016=h5e58377_2
+  - wheel=0.36.2=pyhd3eb1b0_0
+  - wincertstore=0.2=py39h2bbff1b_0
+  - yaml=0.2.5=he774522_0
+  - zipp=3.4.0=pyhd3eb1b0_0
+  - zlib=1.2.11=h62dcd97_4

config/setup.cfg

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+[mypy]
+files=best_practices,test
+ignore_missing_imports=true
+#TODO  We are assuming that our code lives in the best_practices package for the following config.
+
+
+[flake8]
+ignore = E203, E266, E501, W503
+max-line-length = 88
+max-complexity = 18
+select = B,C,E,F,W,T4
+
+
+[isort]
+multi_line_output=3
+include_trailing_comma=True
+force_grid_wrap=0
+use_parentheses=True
+line_length=88