Merge pull request #3910 from brycepg/tweak/tox-black-diff

Modify tox to show diff of formatting changes with black

Thanks @brycepg . For your information `pre-commit` tool may help you to automatically format the code.

1 files changed, 1 insertions, 1 deletions

diff --git a/tox.ini b/tox.ini
index 9ea794983..ed9ea4f9d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -39,7 +39,7 @@ deps =
     black==20.8b1
     isort==5.5.2
 commands =
-    black --check . --exclude="tests/functional/|tests/input|tests/extensions/data|tests/regrtest_data/|tests/data/|venv|astroid|.tox"
+    black --diff --check . --exclude="tests/functional/|tests/input|tests/extensions/data|tests/regrtest_data/|tests/data/|venv|astroid|.tox"
     isort . --check-only
 changedir = {toxinidir}