add black and mypy to dev requirements for cpython

Greg Guthe · g-k · commit dae4602ee064 · 2021-01-25T10:26:01.000-05:00
psf/black#727 python/typed_ast#111
diff --git a/requirements-dev.txt b/requirements-dev.txt
@@ -17,3 +17,9 @@ wheel
 
 # Requirements for updating the vendored html5lib
 hashin
+
+# Requirements for format-check most recently black==20.8b1
+black; implementation_name == "cpython"
+
+# Requirements for type-check most recently mypy==0.790 and mypy-extensions==0.4.3
+mypy; implementation_name == "cpython"
diff --git a/tox.ini b/tox.ini
@@ -49,7 +49,6 @@ basepython = python3.8
 changedir = scripts
 deps =
     -rrequirements-dev.txt
-    black
 commands =
     ./run_tests.sh format-check
 
