Fix line length & don't flake8 docs in python 2

docs/html/conf.py

@@ -278,7 +278,9 @@
 man_dir = os.path.join(docs_dir, 'man/')
 raw_subcommands = glob.glob(os.path.join(man_dir, 'commands/*.rst'))
 if not raw_subcommands:
-    raise FileNotFoundError('The individual subcommand manpages could not be found!')
+    raise FileNotFoundError(
+        'The individual subcommand manpages could not be found!'
+    )
 for fname in raw_subcommands:
     fname_base = fname[len(man_dir):-4]
     outname = 'pip-' + fname_base[9:]

tox.ini

@@ -51,23 +51,25 @@ commands =
 
 [lint]
 deps = -r{toxinidir}/tools/lint-requirements.txt
-commands =
-    flake8
-    isort --check-only --diff
 
 [testenv:lint-py2]
 skip_install = True
 basepython = python2
 deps = {[lint]deps}
 commands_pre =
-commands = {[lint]commands}
+# No need to flake8 docs, tools & tasks in py2
+commands =
+    flake8 src tests
+    isort --check-only --diff
 
 [testenv:lint-py3]
 skip_install = True
 basepython = python3
 deps = {[lint]deps}
 commands_pre =
-commands = {[lint]commands}
+commands =
+    flake8
+    isort --check-only --diff
 
 [testenv:mypy]
 skip_install = True