diff --git a/divide_and_conquer/power.py b/divide_and_conquer/power.py
index 4cb3f4193..deff6e3f1 100644
--- a/divide_and_conquer/power.py
+++ b/divide_and_conquer/power.py
@@ -1,4 +1,4 @@
-def actual_power(a: int, b: int)-> int:
+def actual_power(a: int, b: int) -> int:
     """
     Function using divide and conquer to calculate a^b.
     It only works for integer a,b.