Update spiral_print.py

matrix/spiral_print.py

@@ -7,6 +7,9 @@
 """
 
 
+from typing import Any
+
+
 def check_matrix(matrix: list[list[int]]) -> bool:
     # must be
     matrix = [list(row) for row in matrix]
@@ -79,7 +82,7 @@ def spiral_print_clockwise(a: list[list[int]]) -> None:
 # Other Easy to undersatnd Approach
 
 
-def spiral_traversal(matrix: list[list[int]]) -> list[int]:
+def spiral_traversal(matrix: list[list]) -> list[int]:
     """
     >>> spiral_traversal([[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12]])
     [1, 2, 3, 4, 8, 12, 11, 10, 9, 5, 6, 7]
@@ -123,9 +126,8 @@ def spiral_traversal(matrix: list[list[int]]) -> list[int]:
     Stage 6.
     [1, 2, 3, 4, 8, 12, 11, 10, 9, 5, 6, 7] + spiral_traversal([])
     """
-    return list(matrix.pop(0)) + spiral_traversal(
-        list(map(list, list(zip(*matrix))))[::-1]
-    )
+    matrix = matrix or [[]]
+    return list(matrix.pop(0)) + spiral_traversal(list(zip(*matrix))[::-1])
 
 
 # driver code