less compat reliance

tablib/packages/openpyxl/cell.py

@@ -42,7 +42,6 @@ from .shared.date_time import SharedDate
 from .shared.exc import CellCoordinatesException, \
         ColumnStringIndexException, DataTypeException
 from .style import NumberFormat
-from ...compat import basestring, unicode
 
 # constants
 COORD_RE = re.compile('^[$]?([A-Z]+)[$]?(\d+)$')

tablib/packages/openpyxl/reader/iter_worksheet.py

@@ -31,8 +31,7 @@ from ....compat import BytesIO as StringIO
 import warnings
 import operator
 from functools import partial
-from ....compat import ifilter, xrange
-from itertools import groupby
+from itertools import groupby, ifilter
 from ..worksheet import Worksheet
 from ..cell import coordinate_from_string, get_column_letter, Cell
 from ..reader.excel import get_sheet_ids