def keys(self):
    "Get the 'info axis' (see Indexing for more)\n\n        This is index for Series, columns for DataFrame and major_axis for\n        Panel.\n        "
    return self._info_axis
Get the 'info axis' (see Indexing for more)

This is index for Series, columns for DataFrame and major_axis for
Panel.
def keys(self):
    "Get the 'info axis' (see Indexing for more)\n\n        This is index for Series, columns for DataFrame and major_axis for\n        Panel.\n        "
    return self._info_axis