diff --git a/dynamic_programming/longest_arithmetic_subsequence.py b/dynamic_programming/longest_arithmetic_subsequence.py
index 781af9ef6..c1c54bda1 100644
--- a/dynamic_programming/longest_arithmetic_subsequence.py
+++ b/dynamic_programming/longest_arithmetic_subsequence.py
@@ -1,11 +1,11 @@
 """
-Longest Arithmetic Subsequence Problem: Given an array nums of integers, return the length 
+Longest Arithmetic Subsequence Problem: Given an array nums of integers, return the length
 of the longest arithmetic subsequence in nums.
 
 Note that:
-- A subsequence is an array that can be derived from another array by deleting some or no 
+- A subsequence is an array that can be derived from another array by deleting some or no
   elements without changing the order of the remaining elements.
-- A sequence seq is arithmetic if seq[i + 1] - seq[i] are all the same value (for 0 <= i < 
+- A sequence seq is arithmetic if seq[i + 1] - seq[i] are all the same value (for 0 <= i <
   seq.length - 1).
 """