Follow E231 [flake8] (#6110)

* Remove E231 from ignore list

* Follow E231

* Update pytorch_lightning/trainer/data_loading.py

pytorch_lightning/trainer/data_loading.py

@@ -41,7 +41,7 @@ class TrainerDataLoadingMixin(ABC):
     tpu_local_core_rank: int
     train_dataloader: DataLoader
     num_training_batches: Union[int, float]
-    val_check_batch:...
+    val_check_batch: float
     val_dataloaders: List[DataLoader]
     num_val_batches: List[Union[int, float]]
     test_dataloaders: List[DataLoader]

setup.cfg

@@ -64,10 +64,8 @@ verbose = 2
 # https://pep8.readthedocs.io/en/latest/intro.html#error-codes
 format = pylint
 ignore =
-    E731  # do not assign a lambda expression, use a def
-    W503  # line break before binary operator
-    # because of YAPF - till https://github.com/google/yapf/issues/897 is resolved
-    E231  # missing whitespace after ',', ';', or ':'; for black
+    E731  # Ignore "Do not assign a lambda expression, use a def"
+    W503  # Ignore "Line break occurred before a binary operator"
 
 
 # setup.cfg or tox.ini