Merge pull request SocialfiPanda#9 from resorcap/master

Add `Number of 1 Bits`

Author: SocialfiPanda

Number of 1 Bits.py

@@ -0,0 +1,7 @@
+class Solution:
+    def hammingWeight(self, n):
+        count = 0
+        while n:
+            count += 1
+            n = (n - 1) & n
+        return count