Convert Python format to Black.

Author: jeromekelleher

.flake8

@@ -0,0 +1,6 @@
+[flake8]
+# Based directly on Black's recommendations:
+# https://black.readthedocs.io/en/stable/the_black_code_style.html#line-length
+max-line-length = 81
+select = C,E,F,W,B,B950
+ignore = E203, E501, W503

.github/workflows/lint.yml

@@ -6,20 +6,21 @@ on:
     branches: [master]
 
 jobs:
-  lint-c:
-    runs-on: ubuntu-18.04
-    steps:
-    - uses: actions/checkout@v1
-    - uses: actions/setup-python@v1
-    - name: install clang-format
-      run: |
-        sudo apt-get remove -y clang-6.0 libclang-common-6.0-dev libclang1-6.0 libllvm6.0
-        sudo apt-get autoremove
-        sudo apt-get install clang-format clang-format-6.0
-    - name: install run-clang-format
-      run: wget https://raw.githubusercontent.com/Sarcasm/run-clang-format/de6e8ca07d171a7f378d379ff252a00f2905e81d/run-clang-format.py
-    - name: clang-format
-      run: python run-clang-format.py --clang-format-executable=clang-format -r c/tskit c/tests
+  # Turn off lint-c until we get Black done first.
+  # lint-c:
+  #   runs-on: ubuntu-18.04
+  #   steps:
+  #   - uses: actions/checkout@v1
+  #   - uses: actions/setup-python@v1
+  #   - name: install clang-format
+  #     run: |
+  #       sudo apt-get remove -y clang-6.0 libclang-common-6.0-dev libclang1-6.0 libllvm6.0
+  #       sudo apt-get autoremove
+  #       sudo apt-get install clang-format clang-format-6.0
+  #   - name: install run-clang-format
+  #     run: wget https://raw.githubusercontent.com/Sarcasm/run-clang-format/de6e8ca07d171a7f378d379ff252a00f2905e81d/run-clang-format.py
+  #   - name: clang-format
+  #     run: python run-clang-format.py --clang-format-executable=clang-format -r c/tskit c/tests
   pre-commit:
     runs-on: ubuntu-18.04
     steps: