Update solution 231 [Python3]

Author: chakyam

solution/231.Power of Two/Solution.py

@@ -0,0 +1,13 @@
+class Solution:
+    def isPowerOfTwo(self, n):
+        """
+        :type n: int
+        :rtype: bool
+        """
+        if n<=0:
+            return False
+        m=2**32
+        if m%n:
+            return False
+        else:
+            return True