Add flake8-comprehensions linter (#157)

examples/in_memory/main.py

@@ -27,7 +27,7 @@ async def get_ret():
 @app.get("/")
 @cache(namespace="test", expire=10)
 async def index():
-    return dict(ret=await get_ret())
+    return {"ret": await get_ret()}
 
 
 @app.get("/clear")

examples/redis/main.py

@@ -38,7 +38,7 @@ async def get_ret():
 @app.get("/")
 @cache(namespace="test", expire=10)
 async def index():
-    return dict(ret=await get_ret())
+    return {"ret": await get_ret()}
 
 
 @app.get("/clear")
@@ -58,7 +58,7 @@ async def get_data(request: Request, response: Response):
 @cache(namespace="test", expire=10)
 def blocking():
     time.sleep(2)
-    return dict(ret=42)
+    return {"ret": 42}
 
 
 @app.get("/datetime")

pyproject.toml

@@ -81,12 +81,13 @@ addopts = "-p no:warnings"
 ignore = ["E501"]
 line-length = 80
 select = [
-    "B", # flake8-bugbear
-    "E", # pycodestyle errors
-    "F", # pyflakes
-    "I", # isort
-    "S", # flake8-bandit
-    "W", # pycodestyle warnings
+    "B",  # flake8-bugbear
+    "C4", # flake8-comprehensions
+    "E",  # pycodestyle errors
+    "F",  # pyflakes
+    "I",  # isort
+    "S",  # flake8-bandit
+    "W",  # pycodestyle warnings
     "UP", # pyupgrade
 ]
 target-version = "py37"