Merge pull request doocs#19 from zhanary/master

add two solutions with python

Author: yanglbme

solution/007.Reverse Integer/Solution2.py

@@ -0,0 +1,5 @@
+class Solution:
+    def reverse(self, x):
+        s = cmp(x,0)       #提取此输入数字的符号
+        r = int(`x*s`[::-1])      #先作为字符串输入，然后转回整型
+        return r*s * (r<2**31)          #防止溢出，小于的情况下返回true，否则为false

solution/009.Palindrome Number/Solution.py

@@ -0,0 +1,6 @@
+class Solution(object):
+    def isPalindrome(self, x):
+        a = cmp(x,0)
+        s = a*x
+        y = int(`s`[::-1])
+        return (x == y)