CLN: ASV reshape

[mroeschke]

Flake8'd and simplified setups where available.

$ asv dev -b ^reshape
· Discovering benchmarks
· Running 9 total benchmarks (1 commits * 1 environments * 9 benchmarks)
[  0.00%] ·· Building for existing-py_home_matt_anaconda_envs_pandas_dev_bin_python
[  0.00%] ·· Benchmarking existing-py_home_matt_anaconda_envs_pandas_dev_bin_python
[ 11.11%] ··· Running reshape.Melt.time_melt_dataframe                   7.27ms
[ 22.22%] ··· Running reshape.Pivot.time_reshape_pivot_time_series        441ms
[ 33.33%] ··· Running reshape.PivotTable.time_pivot_table                46.0ms
[ 44.44%] ··· Running reshape.SimpleReshape.time_stack                   6.73ms
[ 55.56%] ··· Running reshape.SimpleReshape.time_unstack                 6.05ms
[ 66.67%] ··· Running reshape.SparseIndex.time_unstack                   2.76ms
[ 77.78%] ··· Running reshape.Unstack.time_full_product                   254ms
[ 88.89%] ··· Running reshape.Unstack.time_without_last_row               477ms
[100.00%] ··· Running reshape.WideToLong.time_wide_to_long_big            378ms

[codecov]

Codecov Report

Merging #18944 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #18944      +/-   ##
==========================================
+ Coverage   91.59%   91.59%   +<.01%     
==========================================
  Files         150      150              
  Lines       48959    48959              
==========================================
+ Hits        44843    44845       +2     
+ Misses       4116     4114       -2

Flag	Coverage Δ
#multiple	89.96% <ø> (ø)	⬆️
#single	41.13% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
pandas/util/testing.py	84.9% <0%> (+0.21%)	⬆️

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[jreback]

thanks!