Fix flake8 issues introduced as a result of #1546 (#1617)

Author: abhinavarora

.flake8

@@ -1,5 +1,9 @@
 [flake8]
-ignore = E401,E402,E501,E722,W503,W504,F821,B006,B007,B008,B009
-select = D417 # Missing argument descriptions in the docstring
+ignore =
+    E401,E402,E501,E722,W503,W504,F821,B006,B007,B008,B009,
+    E203 # https://github.com/PyCQA/pycodestyle/issues/373
+select =
+    B,C,E,F,P,T4,W,B9,
+    D417 # Missing argument descriptions in the docstring
 max-line-length = 120
 exclude = docs/source,third_party

torchtext/data/datasets_utils.py

@@ -7,12 +7,7 @@
 import torch
 from torch.utils.data import functional_datapipe, IterDataPipe
 from torch.utils.data.datapipes.utils.common import StreamWrapper
-from torchtext.utils import download_from_url, extract_archive, unicode_csv_reader, validate_file
-from torchtext.utils import (
-    validate_file,
-    download_from_url,
-    extract_archive,
-)
+from torchtext.utils import download_from_url, extract_archive, validate_file
 
 try:
     import defusedxml.ElementTree as ET

torchtext/datasets/ag_news.py

@@ -11,8 +11,6 @@
     from torchdata.datapipes.iter import FileOpener, HttpReader, IterableWrapper
 
 
-from torchtext.data.datasets_utils import _add_docstring_header, _create_dataset_directory, _wrap_split_argument
-
 URL = {
     "train": "https://raw.githubusercontent.com/mhjabreel/CharCnn_Keras/master/data/ag_news_csv/train.csv",
     "test": "https://raw.githubusercontent.com/mhjabreel/CharCnn_Keras/master/data/ag_news_csv/test.csv",

torchtext/datasets/conll2000chunking.py

@@ -11,8 +11,6 @@
     from torchdata.datapipes.iter import FileOpener, HttpReader, IterableWrapper
 
 
-from torchtext.data.datasets_utils import _add_docstring_header, _create_dataset_directory, _wrap_split_argument
-
 URL = {
     "train": "https://www.clips.uantwerpen.be/conll2000/chunking/train.txt.gz",
     "test": "https://www.clips.uantwerpen.be/conll2000/chunking/test.txt.gz",

torchtext/datasets/squad1.py

@@ -11,8 +11,6 @@
     from torchdata.datapipes.iter import FileOpener, HttpReader, IterableWrapper
 
 
-from torchtext.data.datasets_utils import _add_docstring_header, _create_dataset_directory, _wrap_split_argument
-
 URL = {
     "train": "https://rajpurkar.github.io/SQuAD-explorer/dataset/train-v1.1.json",
     "dev": "https://rajpurkar.github.io/SQuAD-explorer/dataset/dev-v1.1.json",

torchtext/datasets/squad2.py

@@ -11,8 +11,6 @@
     from torchdata.datapipes.iter import FileOpener, HttpReader, IterableWrapper
 
 
-from torchtext.data.datasets_utils import _add_docstring_header, _create_dataset_directory, _wrap_split_argument
-
 URL = {
     "train": "https://rajpurkar.github.io/SQuAD-explorer/dataset/train-v2.0.json",
     "dev": "https://rajpurkar.github.io/SQuAD-explorer/dataset/dev-v2.0.json",