reformatting and styling

pyproject.toml

@@ -1,2 +1,33 @@
 [build-system]
 requires = ["setuptools", "wheel", "Cython", "numpy==1.17.5"]
+
+[flake8]
+max-line-length=120
+
+[tool.black]
+line-length = 120
+target-version = ['py38']
+exclude = '''
+
+(
+  /(
+      \.eggs         # exclude a few common directories in the
+    | \.git          # root of the project
+    | \.hg
+    | \.mypy_cache
+    | \.tox
+    | \.venv
+    | _build
+    | buck-out
+    | build
+    | dist
+  )/
+  | foo.py           # also separately exclude a file named foo.py in
+                     # the root of the project
+)
+'''
+
+[tool.isort]
+line_length = 120
+profile = "black"
+multi_line_output = 3