diff --git a/0007/README.md b/0007/README.md
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+# Reverse Integer
+
+Given a signed 32-bit integer ```x```, return ```x``` with its digits reversed. If reversing ```x``` causes the value to go outside the signed 32-bit integer range ```[-231, 231 - 1]```, then return ```0```.
+
+**Assume the environment does not allow you to store 64-bit integers (signed or unsigned).**
+  
+  
+## Examples
+
+* Example 1
+```
+Input: x = 123
+Output: 321
+```
+
+* Example 2
+```
+Input: x = -123
+Output: -321
+```
+
+* Example 3
+```
+Input: x = 120
+Output: 21
+```
+
+* Example 4
+```
+Input: x = 0
+Output: 0
+```
+
+## Constraints
+* -231 <= x <= 231 - 1
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diff --git a/0007/reverse_integer.py b/0007/reverse_integer.py
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+++ b/0007/reverse_integer.py
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+class Solution:
+    def reverse(self, x):
+        s = str(x)
+        res = (int('-' + s[1:][::-1]) if s[0] == '-' else int(s[::-1]))
+        return (res if -2147483648 <= res <= 2147483647 else 0)