Use pre-commit to run pep8 tests

Change-Id: I063584d84d52fa144b1e5d98b503e312d320bf68

.pre-commit-config.yaml

@@ -0,0 +1,26 @@
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v5.0.0
+    hooks:
+      - id: trailing-whitespace
+      # Replaces or checks mixed line ending
+      - id: mixed-line-ending
+        args: ['--fix', 'lf']
+        exclude: '.*\.(svg)$'
+      # Forbid files which have a UTF-8 byte-order marker
+      - id: check-byte-order-marker
+      # Checks that non-binary executables have a proper shebang
+      - id: check-executables-have-shebangs
+      # Check for files that contain merge conflict strings.
+      - id: check-merge-conflict
+      # Check for debugger imports and py37+ breakpoint()
+      # calls in python source
+      - id: debug-statements
+      - id: check-yaml
+        files: .*\.(yaml|yml)$
+  - repo: https://opendev.org/openstack/hacking
+    rev: 7.0.0
+    hooks:
+      - id: hacking
+        additional_dependencies: []
+        exclude: '^(doc|releasenotes|tools)/.*$'

doc/source/usage.rst

@@ -7,7 +7,7 @@ You can find examples in ``etcd3gw/examples`` and look at ``etcd3gw/client.py``.
 Basic usage example::
 
     from etcd3gw.client import Etcd3Client
- 
+
     client = Etcd3Client(host='localhost', port=2379)
 
     # Put key

test-requirements.txt

@@ -1,5 +1,3 @@
-hacking>=6.1.0,<6.2.0 # Apache-2.0
-
 coverage>=4.0 # Apache-2.0
 python-subunit>=0.0.18 # Apache-2.0/BSD
 oslotest>=1.10.0 # Apache-2.0

tox.ini

@@ -10,7 +10,10 @@ deps = -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/up
 commands = py.test -vv {posargs}
 
 [testenv:pep8]
-commands = flake8 {posargs}
+deps =
+  pre-commit
+commands =
+  pre-commit run --all-files --show-diff-on-failure
 
 [testenv:venv]
 commands = {posargs}