break long lines.

Author: sathyz

pandas/io/parsers.py

@@ -1444,7 +1444,9 @@ def _validate_parse_dates_presence(self, columns: List[str]) -> None:
             # DateGroups = List[ColReference]
             # ParseDates = Union[ DateGroups, List[DateGroups],
             #     Dict[ColReference, DateGroups]]
-            cols_needed = chain.from_iterable([col if isinstance(col, list) else [col] for col in self.parse_dates ])
+            cols_needed = chain.from_iterable(
+                [col if isinstance(col, list) else [col] for col in self.parse_dates]
+            )
         elif isinstance(self.parse_dates, dict):
             cols_needed = list(chain(*self.parse_dates.values()))
         else:

pandas/tests/io/parser/test_parse_dates.py

@@ -1537,7 +1537,9 @@ def test_hypothesis_delimited_date(date_format, dayfirst, delimiter, test_dateti
         ),
     ],
 )
-def test_missing_parse_dates_column_raises(all_parsers, names, usecols, parse_dates, missing_cols):
+def test_missing_parse_dates_column_raises(
+    all_parsers, names, usecols, parse_dates, missing_cols
+):
     # gh-31251 column names provided in parse_dates could be missing.
     parser = all_parsers
     content = StringIO("date,time,val\n2020-01-31,04:20:32,32\n")