fix import grouping
# Licensed under a 3-clause BSD style license - see LICENSE.rst
-from typing import Mapping
# 1. standard library imports
-from numpy import nan
-from numpy import isnan
-from numpy import ndarray
from collections import OrderedDict
+from typing import Mapping
import warnings
# 2. third party imports
@@ -15,6 +12,9 @@ from astropy.io import ascii
from astropy.time import Time
from astropy.utils.exceptions import AstropyDeprecationWarning
from astropy.utils.decorators import deprecated_renamed_argument, deprecated_attribute
+from numpy import nan
+from numpy import isnan
+from numpy import ndarray
# 3. local imports - use relative imports
# commonly required local imports shown below as example
