ci: Add yesqa pre-commit hook (#1932)

* Add and apply yesqa pre-commit hook.
* Move flake8 options 'count' and 'statistics' from the flake8 config
in setup.cfg to args for the flake8 pre-commit hook to avoid problems
with yesqa.
   - c.f. asottile/yesqa#132

.pre-commit-config.yaml

@@ -48,10 +48,16 @@ repos:
     - id: blacken-docs
       additional_dependencies: [black==22.6.0]
 
+-   repo: https://github.com/asottile/yesqa
+    rev: v1.4.0
+    hooks:
+    - id: yesqa
+
 -   repo: https://github.com/PyCQA/flake8
     rev: 5.0.2
     hooks:
     - id: flake8
+      args: ["--count", "--statistics"]
 
 -   repo: https://github.com/nbQA-dev/nbQA
     rev: 1.4.0

setup.cfg

@@ -56,5 +56,3 @@ console_scripts =
 # E501: line too long
 extend-ignore = E203, E402, E501
 max-line-length = 88
-count = True
-statistics = True

src/pyhf/infer/__init__.py

@@ -204,7 +204,7 @@ def hypotest(
     return tuple(_returns) if len(_returns) > 1 else _returns[0]
 
 
-from pyhf.infer import intervals  # noqa: F401
+from pyhf.infer import intervals
 
 __all__ = ["hypotest", "calculators", "intervals", "mle", "test_statistics", "utils"]