added workaround for supporting string in Python 2.7

Author: alixdamman

larray/inout/common.py

@@ -4,7 +4,7 @@
 from datetime import date, time, datetime
 from collections import OrderedDict
 
-from larray.util.compat import basestring
+from larray.util.compat import basestring, PY2
 from larray.core.axis import Axis
 from larray.core.group import Group
 from larray.core.array import Array
@@ -18,6 +18,8 @@
 _supported_scalars_types = (int, float, bool, basestring, date, time, datetime)
 _supported_types = _supported_larray_types + _supported_scalars_types
 _supported_typenames = {cls.__name__ for cls in _supported_types}
+if PY2:
+    _supported_typenames.add('str')
 
 
 def _get_index_col(nb_axes=None, index_col=None, wide=True):