Switch to using the incremental pylint. Turn on documentation linters. (quantumlib#4267)

This PR is related to: quantumlib#3388

We'd like to add some documentation rules to pylint but doing so would require us to add a significant amount of documentation to the current code.  In order to start enforcing this rule sooner rather than later. I added an incremental lint task to the ci.  The incremental lint task will check more rules but only check them on changed files.

Author: than4213

.github/workflows/ci.yml

@@ -102,6 +102,23 @@ jobs:
         run: check/pylint --version
       - name: Lint
         run: check/pylint -v
+  incremental_lint:
+    name: Incremental Lint check
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - uses: actions/setup-python@v1
+        with:
+          python-version: '3.8'
+          architecture: 'x64'
+      - name: Install pylint
+        run: pip install -r dev_tools/requirements/deps/pylint.txt
+      - name: Display version
+        run: check/pylint --version
+      - name: Lint
+        run: check/pylint-changed-files
   doc_test:
     name: Doc test
     runs-on: ubuntu-20.04

check/pylint-changed-files

@@ -64,5 +64,5 @@ echo "Found ${num_changed} lintable files associated with changes." >&2
 if [ "${num_changed}" -eq 0 ]; then
     exit 0
 fi
-pylint --rcfile=dev_tools/conf/.pylintrc ${changed[@]}
+pylint --rcfile=dev_tools/conf/incremental.pylintrc ${changed[@]}
 

dev_tools/bash_scripts_test.py

@@ -617,7 +617,7 @@ def test_pylint_changed_files_file_selection(tmpdir_factory):
         ).split()
     )
 
-    intercepted_prefix = 'INTERCEPTED pylint --rcfile=dev_tools/conf/.pylintrc '
+    intercepted_prefix = 'INTERCEPTED pylint --rcfile=dev_tools/conf/incremental.pylintrc '
 
     result = run(
         script_file='check/pylint-changed-files',

dev_tools/conf/incremental.pylintrc

@@ -0,0 +1,75 @@
+[MASTER]
+load-plugins=pylint.extensions.docparams,pylint.extensions.docstyle
+max-line-length=100
+disable=all
+ignore-patterns=.*_pb2\.py,quantum_engine_service_client.py,engine_pb2_grpc.py
+output-format=colorized
+score=no
+reports=no
+enable=
+    anomalous-backslash-in-string,
+    assert-on-tuple,
+    bad-indentation,
+    bad-option-value,
+    bad-reversed-sequence,
+    bad-super-call,
+    consider-merging-isinstance,
+    continue-in-finally,
+    dangerous-default-value,
+    docstyle,
+    duplicate-argument-name,
+    expression-not-assigned,
+    function-redefined,
+    inconsistent-mro,
+    init-is-generator,
+    line-too-long,
+    lost-exception,
+    missing-kwoa,
+    mixed-indentation,
+    mixed-line-endings,
+    not-callable,
+    no-value-for-parameter,
+    nonexistent-operator,
+    not-in-loop,
+    parameter_documentation,
+    pointless-statement,
+    redefined-builtin,
+    relative-import,
+    return-arg-in-generator,
+    return-in-init,
+    return-outside-function,
+    simplifiable-if-statement,
+    syntax-error,
+    too-many-function-args,
+    trailing-whitespace,
+    # Disabling until https://github.com/PyCQA/pylint/issues/3791 is fixed
+    # undefined-variable,
+    unexpected-keyword-arg,
+    unhashable-dict-key,
+    unnecessary-pass,
+    unreachable,
+    unrecognized-inline-option,
+    unused-import,
+    unnecessary-semicolon,
+    unused-variable,
+    unused-wildcard-import,
+    wildcard-import,
+    wrong-import-order,
+    wrong-import-position,
+    yield-outside-function
+
+# Ignore long lines containing urls or pylint directives.
+ignore-long-lines=^(.*#\w*pylint: disable.*|\s*(# )?<?https?://\S+>?)$
+
+[TYPECHECK]
+
+# List of members which are set dynamically and missed by pylint inference
+# system, and so shouldn't trigger E1101 when accessed. Python regular
+# expressions are accepted.
+generated-members=numpy.*
+
+
+[IMPORTS]
+
+# Force import order to recognize a module as part of a third party library.
+known-third-party=cirq,cirq_google,cirq_aqt,cirq_ionq