Applying black formatting

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

benchmark/catrank_pycapnp.py

@@ -5,17 +5,19 @@ import catrank_capnp
 from common import rand_int, rand_double, rand_bool, WORDS
 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
+
 
 class Benchmark:
     def __init__(self, compression):
         self.Request = catrank_capnp.SearchResultList.new_message
         self.Response = catrank_capnp.SearchResultList.new_message
-        if compression == 'packed':
+        if compression == "packed":
             self.from_bytes_request = catrank_capnp.SearchResultList.from_bytes_packed
             self.from_bytes_response = catrank_capnp.SearchResultList.from_bytes_packed
             self.to_bytes = lambda x: x.to_bytes_packed()
@@ -28,12 +30,14 @@ class Benchmark:
         goodCount = 0
         count = rand_int(1000)
 
-        results = request.init('results', count)
+        results = request.init("results", count)
 
         for i, result in enumerate(results):
             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()
@@ -49,12 +53,12 @@ class Benchmark:
 
             snippet += [choice(WORDS) for i in range(rand_int(20))]
 
-            result.snippet = ''.join(snippet)
+            result.snippet = "".join(snippet)
 
         return goodCount
 
     def handle(self, request, response):
-        results = response.init('results', len(request.results))
+        results = response.init("results", len(request.results))
 
         for req, resp in izip(request.results, results):
             score = req.score
@@ -68,7 +72,6 @@ class Benchmark:
             resp.url = req.url
             resp.snippet = req.snippet
 
-
     def check(self, response, expected):
         goodCount = 0