Lint Python code with ruff

.github/workflows/lint.yml

@@ -40,11 +40,16 @@ jobs:
     - name: Install tools
       run: |
         eval "$(/home/linuxbrew/.linuxbrew/bin/brew shellenv)"
-        brew install buildifier typos-cli
+        brew install buildifier ruff typos-cli
 
     - name: Check typos
       run: |
         eval "$(/home/linuxbrew/.linuxbrew/bin/brew shellenv)"
         ./scripts/check_typos.sh
 
+    - name: Lint Python code
+      run: |
+        eval "$(/home/linuxbrew/.linuxbrew/bin/brew shellenv)"
+        ruff check
+
     # TODO(eustas): run buildifier

research/brotlidump.py

@@ -8,6 +8,7 @@ I found the following issues with the Brotli format:
 - The block type code is useless if NBLTYPES==2, you would only need 1 symbol
   anyway, so why don't you just switch to "the other" type?
 """
+# ruff: noqa
 import struct
 from operator import itemgetter, methodcaller
 from itertools import accumulate, repeat