[pre-commit] Add pre-commit and flake8 configuration file

.flake8

+[flake8]
+max-line-length = 80
+select = B,C,E,F,W,T4,B9,B950
+ignore = E501, W503

.pre-commit-config.yaml

+# See https://pre-commit.com for more information
+# See https://pre-commit.com/hooks.html for more hooks
+repos:
+  - repo: https://github.com/ambv/black
+    rev: stable
+    hooks:
+    - id: black
+      language_version: python3.6
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v2.0.0
+    hooks:
+      - id: trailing-whitespace
+      - id: end-of-file-fixer
+      - id: debug-statements
+      - id: check-added-large-files
+      - id: check-docstring-first
+      - id: flake8
+      - id: check-yaml
+        exclude: conda/meta.yaml
+  - repo: https://github.com/PyCQA/bandit
+    rev: 'master' # Update me!
+    hooks:
+      - id: bandit
+        exclude: beat/editor/test
+  - repo: local
+    hooks:
+      - id: sphinx-build
+        name: sphinx build
+        entry: python -m sphinx.cmd.build
+        args: [-a, -E, -W, doc, sphinx]
+        language: system
+        files: ^doc/
+        types: [file]
+        pass_filenames: false
+      - id: sphinx-doctest
+        name: sphinx doctest
+        entry: python -m sphinx.cmd.build
+        args: [-a, -E, -b, doctest, doc, sphinx]
+        language: system
+        files: ^doc/
+        types: [file]
+        pass_filenames: false

beat/core/worker.py

@@ -67,6 +67,7 @@ class WorkerController(object):
     # Status code
     READY = b'rdy'  #: The worker is ready to be used
     EXIT = b'ext'  #: The worker has exited
+    RECEIVED = b'rcv' #: The worker has received the task
     DONE = b'don'  #: The worker as successfully finished its task
     JOB_ERROR = b'erj'  #: The worker failed to finish its task
     ERROR = b'err'  #: The worker encountered an error