sorting import statement alphabetically

src/pymor/models/transfer_function.py

@@ -2,6 +2,8 @@
 # Copyright pyMOR developers and contributors. All rights reserved.
 # License: BSD 2-Clause License (https://opensource.org/licenses/BSD-2-Clause)
 
+from itertools import chain
+
 import numpy as np
 import scipy.linalg as spla
 
@@ -11,8 +13,6 @@ from pymor.operators.block import BlockColumnOperator, BlockDiagonalOperator, Bl
 from pymor.parameters.base import Mu, ParametricObject
 from pymor.tools.plot import adaptive
 
-from itertools import chain
-
 
 class TransferFunction(CacheableObject, ParametricObject):
     r"""Class for systems represented by a transfer function.