Add flake8 to continuous integration

.github/workflows/main.yml

-name: Run Python Tests
+name: Run Tests
 on:
   push:
   pull_request:
   workflow_dispatch:
 jobs:
-  build:
+  flake8:
+    name: Check Code Style
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v1
+        with:
+          python-version: 3.7
+      - run: |
+          python -m pip install --upgrade pip
+          pip install flake8
+      - run: |
+          flake8
+  unit_tests:
+    name: Run Unit Tests
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2

scripts/__init__.py

-from .common import get_topics, get_judged_documents, get_ndcg as ndcg, get_ndcg, get_random_ndcg, get_random_normalized_ndcg, get_judgement
+from .common import (
+    get_topics,
+    get_judged_documents,
+    get_ndcg as ndcg,
+    get_ndcg,
+    get_random_ndcg,
+    get_random_normalized_ndcg,
+    get_judgement,
+)
+
+__all__ = [
+    'get_topics',
+    'get_judged_documents',
+    'ndcg',
+    'get_ndcg',
+    'get_random_ndcg',
+    'get_random_normalized_ndcg',
+    'get_judgement',
+]

scripts/common.py

 # -*- coding:utf-8 -*-
 
 from copy import deepcopy
-from itertools import chain
 from math import log2
 
 import numpy as np

setup.cfg

+[flake8]
+max-line-length = 120

test/test_get_judgement.py

-from math import log2
 import unittest
 
 from arqmath_eval import get_judgement

test/test_get_ndcg.py

@@ -55,8 +55,8 @@ class TestGetNDCG(unittest.TestCase):
                 '1282114': 0.15,
             },
             'A.31': {
-                '439044': 1.00,    
-                '692232': 0.50,    
+                '439044': 1.00,
+                '692232': 0.50,
             },
         }
         ndcg = get_ndcg(parsed_run, 'task1-example', 'test')
@@ -117,8 +117,8 @@ class TestGetNDCG(unittest.TestCase):
                 'unjudged_2': 0.05,
             },
             'A.31': {
-                '439044': 1.00,    
-                '692232': 0.50,    
+                '439044': 1.00,
+                '692232': 0.50,
             },
         }
         ndcg = get_ndcg(parsed_run, 'task1-example', 'test')