Add pre-commit config

.pre-commit-config.yaml

@@ -0,0 +1,13 @@
+repos:
+  - repo: https://github.com/pycqa/isort
+    rev: 5.10.1
+    hooks:
+      - id: isort
+  - repo: https://github.com/pre-commit/mirrors-autopep8
+    rev: v2.0.0
+    hooks:
+      - id: autopep8
+  - repo: https://github.com/PyCQA/flake8
+    rev: 5.0.4
+    hooks:
+      - id: flake8

setup.cfg

@@ -2,5 +2,18 @@
 universal = True
 
 [flake8]
-exclude = youtube_dl/extractor/__init__.py,devscripts/buildserver.py,devscripts/lazy_load_template.py,devscripts/make_issue_template.py,setup.py,build,.git,venv
+exclude = build,venv,.tox,.git,.pytest_cache
 ignore = E402,E501,E731,E741,W503
+max_line_length = 80
+per_file_ignores =
+    devscripts/lazy_load_template.py: F401
+
+[isort]
+py_version = 27
+multi_line_output = VERTICAL_HANGING_INDENT
+line_length = 80
+reverse_relative = true
+ensure_newline_before_comments = true
+include_trailing_comma = true
+known_first_party =
+    test