if 'AACGM_v2_DAT_PREFIX' in _os.environ.keys():
    # Check and see if this environment variable is the same or different
    if not _os.environ['AACGM_v2_DAT_PREFIX'] == AACGM_v2_DAT_PREFIX:
        stderr.write("".join(["resetting environment variable ",
                              "AACGM_v2_DAT_PREFIX in python script\n"]))