CLN: C408 Unnecessary dict call - rewrite as a literal

The following files contain flake8 C408 Unnecessary dict call - rewrite as a literal. Good for first time contributors. See #38078 and #38116 for how to fix them. Use flake8 [file_path] to check for each file.

C408

• ./pandas/core/generic.py
• ./pandas/core/series.py
• ./pandas/core/frame.py
• ./pandas/core/strings/accessor.py
• ./pandas/core/dtypes/dtypes.py
• ./pandas/core/computation/pytables.py
• ./pandas/core/computation/expressions.py
• ./pandas/core/arrays/floating.py
• ./pandas/core/arrays/interval.py
• ./pandas/core/arrays/numpy_.py
• ./pandas/core/arrays/base.py
• ./pandas/core/ops/methods.py
• ./pandas/core/indexes/interval.py
• ./pandas/core/indexes/multi.py
• ./pandas/core/indexes/numeric.py
• ./pandas/core/indexes/base.py
• ./pandas/io/pytables.py
• ./pandas/tests/reshape/concat/test_datetimes.py
• ./pandas/tests/reshape/merge/test_merge.py
• ./pandas/tests/reshape/merge/test_multi.py
• ./pandas/tests/tools/test_to_numeric.py
• ./pandas/tests/resample/test_time_grouper.py
• ./pandas/tests/util/test_assert_series_equal.py
• ./pandas/tests/util/test_assert_interval_array_equal.py
• ./pandas/tests/util/test_assert_index_equal.py
• ./pandas/tests/util/test_assert_extension_array_equal.py
• ./pandas/tests/io/test_parquet.py
• ./pandas/tests/io/generate_legacy_storage_files.py
• ./pandas/tests/io/formats/test_format.py
• ./pandas/tests/io/parser/test_comment.py
• ./pandas/tests/io/parser/test_parse_dates.py
• ./pandas/tests/io/parser/test_c_parser_only.py
• ./pandas/tests/io/parser/test_dialect.py
• ./pandas/tests/io/parser/test_skiprows.py
• ./pandas/tests/io/parser/test_encoding.py
• ./pandas/tests/io/parser/test_read_fwf.py
• ./pandas/tests/io/parser/test_python_parser_only.py
• ./pandas/tests/io/parser/test_na_values.py
• ./pandas/tests/io/parser/test_usecols.py
• ./pandas/tests/io/parser/test_quoting.py
• ./pandas/tests/io/parser/test_header.py
• ./pandas/tests/io/parser/test_index_col.py
• ./pandas/tests/io/json/test_ujson.py
• ./pandas/tests/io/json/test_normalize.py
• ./pandas/tests/io/pytables/test_timezones.py
• ./pandas/tests/io/pytables/test_store.py
• ./pandas/tests/frame/test_reductions.py
• ./pandas/tests/frame/test_arithmetic.py
• ./pandas/tests/frame/methods/test_to_records.py
• ./pandas/tests/frame/methods/test_sort_values.py
• ./pandas/tests/frame/methods/test_fillna.py
• ./pandas/tests/frame/methods/test_to_csv.py
• ./pandas/tests/frame/indexing/test_indexing.py
• ./pandas/tests/frame/indexing/test_where.py
• ./pandas/tests/dtypes/test_inference.py
• ./pandas/tests/groupby/test_function.py
• ./pandas/tests/groupby/transform/test_transform.py
• ./pandas/tests/plotting/test_boxplot_method.py
• ./pandas/tests/plotting/frame/test_frame_subplots.py
• ./pandas/tests/io/parser/test_common.py

Remove ignore setting from flake8 section

• setup.cfg

[jreback]

close the issue when the checks are updated

[skvrahul]

Created a PR (#38180 )that addresses the following files:

./pandas/tests/reshape/concat/test_datetimes.py ./pandas/tests/reshape/merge/test_merge.py ./pandas/tests/reshape/merge/test_multi.py

@fangchenli Is a whatsnew entry necessary for such a change in the code?