Update largest-3-same-digit-number-in-string.py

Author: kamyu104

Python/largest-3-same-digit-number-in-string.py

@@ -29,4 +29,4 @@ def largestGoodInteger(self, num):
         :type num: str
         :rtype: str
         """
-        return max(num[i] if num[i] == num[i+1] == num[i+2] else "" for i in xrange(len(num)-2))*3
+        return max(num[i] if num[i] == num[i+1] == num[i+2] else '' for i in xrange(len(num)-2))*3