Removing unused imports to fix test error

Author: ryankarlos

pandas/io/packers.py

@@ -62,15 +62,11 @@
 from pandas.core.arrays.categorical import Categorical
 from pandas.core.arrays.interval import Interval
 from pandas.core.arrays.sparse import BlockIndex, IntIndex
-from pandas.core.frame import DataFrame
 from pandas.core.generic import NDFrame
-from pandas.core.index import (
-    Float64Index, Index, Int64Index, MultiIndex, PeriodIndex, RangeIndex,
-    TimedeltaIndex)
+from pandas.core.index import Index, MultiIndex, PeriodIndex, RangeIndex
 from pandas.core.indexes.datetimes import DatetimeIndex
 from pandas.core.indexes.interval import IntervalIndex
 from pandas.core.internals import BlockManager, _safe_reshape, make_block
-from pandas.core.panel import Panel
 from pandas.core.series import Series
 from pandas.core.sparse.api import SparseDataFrame, SparseSeries