isort tests/reshape, plotting, sparse
- [ ] closes #xxxx
- [ ] tests added / passed
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

Hello @jbrockmendel! Thanks for submitting the PR.

 - There are no PEP8 issues in the file [`pandas/tests/plotting/common.py`](https://github.com/jbrockmendel/pandas/blob/3d1d1687e33b3f0498d3eb063ab2ab8422ad7740/pandas/tests/plotting/common.py) !

 - There are no PEP8 issues in the file [`pandas/tests/plotting/test_boxplot_method.py`](https://github.com/jbrockmendel/pandas/blob/3d1d1687e33b3f0498d3eb063ab2ab8422ad7740/pandas/tests/plotting/test_boxplot_method.py) !

 - There are no PEP8 issues in the file [`pandas/tests/plotting/test_converter.py`](https://github.com/jbrockmendel/pandas/blob/3d1d1687e33b3f0498d3eb063ab2ab8422ad7740/pandas/tests/plotting/test_converter.py) !

 - There are no PEP8 issues in the file [`pandas/tests/plotting/test_datetimelike.py`](https://github.com/jbrockmendel/pandas/blob/3d1d1687e33b3f0498d3eb063ab2ab8422ad7740/pandas/tests/plotting/test_datetimelike.py) !

 - There are no PEP8 issues in the file [`pandas/tests/plotting/test_frame.py`](https://github.com/jbrockmendel/pandas/blob/3d1d1687e33b3f0498d3eb063ab2ab8422ad7740/pandas/tests/plotting/test_frame.py) !

 - There are no PEP8 issues in the file [`pandas/tests/plotting/test_groupby.py`](https://github.com/jbrockmendel/pandas/blob/3d1d1687e33b3f0498d3eb063ab2ab8422ad7740/pandas/tests/plotting/test_groupby.py) !

 - There are no PEP8 issues in the file [`pandas/tests/plotting/test_hist_method.py`](https://github.com/jbrockmendel/pandas/blob/3d1d1687e33b3f0498d3eb063ab2ab8422ad7740/pandas/tests/plotting/test_hist_method.py) !

 - There are no PEP8 issues in the file [`pandas/tests/plotting/test_misc.py`](https://github.com/jbrockmendel/pandas/blob/3d1d1687e33b3f0498d3eb063ab2ab8422ad7740/pandas/tests/plotting/test_misc.py) !

 - There are no PEP8 issues in the file [`pandas/tests/plotting/test_series.py`](https://github.com/jbrockmendel/pandas/blob/3d1d1687e33b3f0498d3eb063ab2ab8422ad7740/pandas/tests/plotting/test_series.py) !

 - There are no PEP8 issues in the file [`pandas/tests/reshape/merge/test_join.py`](https://github.com/jbrockmendel/pandas/blob/3d1d1687e33b3f0498d3eb063ab2ab8422ad7740/pandas/tests/reshape/merge/test_join.py) !

 - There are no PEP8 issues in the file [`pandas/tests/reshape/merge/test_merge.py`](https://github.com/jbrockmendel/pandas/blob/3d1d1687e33b3f0498d3eb063ab2ab8422ad7740/pandas/tests/reshape/merge/test_merge.py) !

 - There are no PEP8 issues in the file [`pandas/tests/reshape/merge/test_merge_asof.py`](https://github.com/jbrockmendel/pandas/blob/3d1d1687e33b3f0498d3eb063ab2ab8422ad7740/pandas/tests/reshape/merge/test_merge_asof.py) !

 - There are no PEP8 issues in the file [`pandas/tests/reshape/merge/test_merge_ordered.py`](https://github.com/jbrockmendel/pandas/blob/3d1d1687e33b3f0498d3eb063ab2ab8422ad7740/pandas/tests/reshape/merge/test_merge_ordered.py) !

 - There are no PEP8 issues in the file [`pandas/tests/reshape/test_concat.py`](https://github.com/jbrockmendel/pandas/blob/3d1d1687e33b3f0498d3eb063ab2ab8422ad7740/pandas/tests/reshape/test_concat.py) !

 - There are no PEP8 issues in the file [`pandas/tests/reshape/test_melt.py`](https://github.com/jbrockmendel/pandas/blob/3d1d1687e33b3f0498d3eb063ab2ab8422ad7740/pandas/tests/reshape/test_melt.py) !

 - There are no PEP8 issues in the file [`pandas/tests/reshape/test_pivot.py`](https://github.com/jbrockmendel/pandas/blob/3d1d1687e33b3f0498d3eb063ab2ab8422ad7740/pandas/tests/reshape/test_pivot.py) !

 - There are no PEP8 issues in the file [`pandas/tests/reshape/test_reshape.py`](https://github.com/jbrockmendel/pandas/blob/3d1d1687e33b3f0498d3eb063ab2ab8422ad7740/pandas/tests/reshape/test_reshape.py) !

 - There are no PEP8 issues in the file [`pandas/tests/reshape/test_tile.py`](https://github.com/jbrockmendel/pandas/blob/3d1d1687e33b3f0498d3eb063ab2ab8422ad7740/pandas/tests/reshape/test_tile.py) !

 - There are no PEP8 issues in the file [`pandas/tests/reshape/test_union_categoricals.py`](https://github.com/jbrockmendel/pandas/blob/3d1d1687e33b3f0498d3eb063ab2ab8422ad7740/pandas/tests/reshape/test_union_categoricals.py) !

 - There are no PEP8 issues in the file [`pandas/tests/reshape/test_util.py`](https://github.com/jbrockmendel/pandas/blob/3d1d1687e33b3f0498d3eb063ab2ab8422ad7740/pandas/tests/reshape/test_util.py) !

 - There are no PEP8 issues in the file [`pandas/tests/sparse/frame/conftest.py`](https://github.com/jbrockmendel/pandas/blob/3d1d1687e33b3f0498d3eb063ab2ab8422ad7740/pandas/tests/sparse/frame/conftest.py) !

 - There are no PEP8 issues in the file [`pandas/tests/sparse/frame/test_analytics.py`](https://github.com/jbrockmendel/pandas/blob/3d1d1687e33b3f0498d3eb063ab2ab8422ad7740/pandas/tests/sparse/frame/test_analytics.py) !

 - There are no PEP8 issues in the file [`pandas/tests/sparse/frame/test_apply.py`](https://github.com/jbrockmendel/pandas/blob/3d1d1687e33b3f0498d3eb063ab2ab8422ad7740/pandas/tests/sparse/frame/test_apply.py) !

 - There are no PEP8 issues in the file [`pandas/tests/sparse/frame/test_frame.py`](https://github.com/jbrockmendel/pandas/blob/3d1d1687e33b3f0498d3eb063ab2ab8422ad7740/pandas/tests/sparse/frame/test_frame.py) !

 - There are no PEP8 issues in the file [`pandas/tests/sparse/frame/test_indexing.py`](https://github.com/jbrockmendel/pandas/blob/3d1d1687e33b3f0498d3eb063ab2ab8422ad7740/pandas/tests/sparse/frame/test_indexing.py) !

 - There are no PEP8 issues in the file [`pandas/tests/sparse/frame/test_to_csv.py`](https://github.com/jbrockmendel/pandas/blob/3d1d1687e33b3f0498d3eb063ab2ab8422ad7740/pandas/tests/sparse/frame/test_to_csv.py) !

 - There are no PEP8 issues in the file [`pandas/tests/sparse/frame/test_to_from_scipy.py`](https://github.com/jbrockmendel/pandas/blob/3d1d1687e33b3f0498d3eb063ab2ab8422ad7740/pandas/tests/sparse/frame/test_to_from_scipy.py) !

 - There are no PEP8 issues in the file [`pandas/tests/sparse/series/test_indexing.py`](https://github.com/jbrockmendel/pandas/blob/3d1d1687e33b3f0498d3eb063ab2ab8422ad7740/pandas/tests/sparse/series/test_indexing.py) !

 - There are no PEP8 issues in the file [`pandas/tests/sparse/series/test_series.py`](https://github.com/jbrockmendel/pandas/blob/3d1d1687e33b3f0498d3eb063ab2ab8422ad7740/pandas/tests/sparse/series/test_series.py) !

 - There are no PEP8 issues in the file [`pandas/tests/sparse/test_combine_concat.py`](https://github.com/jbrockmendel/pandas/blob/3d1d1687e33b3f0498d3eb063ab2ab8422ad7740/pandas/tests/sparse/test_combine_concat.py) !

 - There are no PEP8 issues in the file [`pandas/tests/sparse/test_format.py`](https://github.com/jbrockmendel/pandas/blob/3d1d1687e33b3f0498d3eb063ab2ab8422ad7740/pandas/tests/sparse/test_format.py) !

 - There are no PEP8 issues in the file [`pandas/tests/sparse/test_indexing.py`](https://github.com/jbrockmendel/pandas/blob/3d1d1687e33b3f0498d3eb063ab2ab8422ad7740/pandas/tests/sparse/test_indexing.py) !

 - There are no PEP8 issues in the file [`pandas/tests/sparse/test_pivot.py`](https://github.com/jbrockmendel/pandas/blob/3d1d1687e33b3f0498d3eb063ab2ab8422ad7740/pandas/tests/sparse/test_pivot.py) !

 - There are no PEP8 issues in the file [`pandas/tests/sparse/test_reshape.py`](https://github.com/jbrockmendel/pandas/blob/3d1d1687e33b3f0498d3eb063ab2ab8422ad7740/pandas/tests/sparse/test_reshape.py) !

 i think this has some actual import errors note you can leave these relatively straightforward PR's for new contributors (unless of course things are blocking). let's fix & merge this one as already done.