isort --profile black . (#2181)

* updating DIRECTORY.md

* isort --profile black .

* Black after

* updating DIRECTORY.md

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data_structures/binary_tree/non_recursive_segment_tree.py

@@ -35,7 +35,7 @@ https://www.geeksforgeeks.org/segment-tree-efficient-implementation/
 >>> st.query(0, 2)
 [1, 2, 3]
 """
-from typing import List, Callable, TypeVar
+from typing import Callable, List, TypeVar
 
 T = TypeVar("T")