format by black and isort

cidr4_merger.py

@@ -1,8 +1,8 @@
 import cProfile
-from typing import Optional
 from collections.abc import Iterator
+from typing import Optional
 
-Node = tuple[int, int, int] # только аннотация
+Node = tuple[int, int, int]
 
 
 def get_data(input_file):
@@ -27,6 +27,7 @@ def sort_nodes(nodes: Iterator[Node]) -> list[Node]:
 def data_to_nodes(data: Iterator[str]) -> Iterator[Node]:
     return map(cidr4_to_node, data)
 
+
 def get_mask(ip, mask_len) -> int:
     mask = ((1 << mask_len) - 1) << (32 - mask_len)
     netaddr = ip & mask