Applying black formatting

- Fixing flake8 configuration to agree with black
- Adding black validation check to github actions

benchmark/catrank_proto.py

@@ -3,13 +3,15 @@
 from common import rand_int, rand_double, rand_bool, WORDS, from_bytes_helper
 from random import choice
 from string import ascii_letters
+
 try:
-  # Python 2
-  from itertools import izip
+    # Python 2
+    from itertools import izip
 except ImportError:
-  izip = zip
+    izip = zip
 import catrank_pb2
 
+
 class Benchmark:
     def __init__(self, compression):
         self.Request = catrank_pb2.SearchResultList
@@ -26,7 +28,9 @@ class Benchmark:
             result = request.result.add()
             result.score = 1000 - i
             url_size = rand_int(100)
-            result.url = "http://example.com/" + ''.join([choice(ascii_letters) for _ in range(url_size)])
+            result.url = "http://example.com/" + "".join(
+                [choice(ascii_letters) for _ in range(url_size)]
+            )
 
             isCat = rand_bool()
             isDog = rand_bool()
@@ -42,7 +46,7 @@ class Benchmark:
 
             snippet += [choice(WORDS) for i in range(rand_int(20))]
 
-            result.snippet = ''.join(snippet)
+            result.snippet = "".join(snippet)
 
         return goodCount
 
@@ -60,10 +64,9 @@ class Benchmark:
             resp.url = req.url
             resp.snippet = req.snippet
 
-
     def check(self, response, expected):
         goodCount = 0
-        
+
         for result in response.result:
             if result.score > 1001:
                 goodCount += 1