solves find the difference in python

Author: anishLearnsToCode

Diff for: README.md

@@ -104,7 +104,7 @@
 | 374 | [Guess Number Higher or Lower](https://leetcode.com/problems/guess-number-higher-or-lower) | Easy | [![Java](https://img.icons8.com/color/40/000000/java-coffee-cup-logo.png)](https://github.com/anishLearnsToCode/leetcode-algorithms/blob/master/src/GuessNumberHigherOrLower.java) [![Python](https://img.icons8.com/color/35/000000/python.png)](python/guess_number_higher_or_lower.py) |
 | 383 | [Ransom Note](https://leetcode.com/problems/ransom-note) | Easy | [![Java](https://img.icons8.com/color/40/000000/java-coffee-cup-logo.png)](https://github.com/anishLearnsToCode/leetcode-algorithms/blob/master/src/RansomNote.java) [![Python](https://img.icons8.com/color/35/000000/python.png)](python/ransom_note.py) |
 | 387 | [First Unique Character in String](https://leetcode.com/problems/first-unique-character-in-a-string) | Easy | [![Java](https://img.icons8.com/color/40/000000/java-coffee-cup-logo.png)](https://github.com/anishLearnsToCode/leetcode-algorithms/blob/master/src/FirstUniqueCharacter.java) [![Python](https://img.icons8.com/color/35/000000/python.png)](python/first_unique_character_in_string.py) |
-| 389 | [Find the Difference](https://leetcode.com/problems/find-the-difference) | Easy | [![Java](https://img.icons8.com/color/40/000000/java-coffee-cup-logo.png)](https://github.com/anishLearnsToCode/leetcode-algorithms/blob/master/src/FindTheDifference.java) |
+| 389 | [Find the Difference](https://leetcode.com/problems/find-the-difference) | Easy | [![Java](https://img.icons8.com/color/40/000000/java-coffee-cup-logo.png)](https://github.com/anishLearnsToCode/leetcode-algorithms/blob/master/src/FindTheDifference.java) [![Python](https://img.icons8.com/color/35/000000/python.png)](python/find_the_difference.py) |
 | 392 | [Is Subsequence](https://leetcode.com/problems/is-subsequence) | Easy | [![Java](https://img.icons8.com/color/40/000000/java-coffee-cup-logo.png)](https://github.com/anishLearnsToCode/leetcode-algorithms/blob/master/src/IsSubsequence.java) |
 | 401 | [Binary Watch](https://leetcode.com/problems/binary-watch) | Easy | [![Java](https://img.icons8.com/color/40/000000/java-coffee-cup-logo.png)](https://github.com/anishLearnsToCode/leetcode-algorithms/blob/master/src/BinaryWatch.java) |
 | 404 | [Sum of Left Leaves](https://leetcode.com/problems/sum-of-left-leaves) | Easy | [![Java](https://img.icons8.com/color/40/000000/java-coffee-cup-logo.png)](https://github.com/anishLearnsToCode/leetcode-algorithms/blob/master/src/SumOfLeftLeaves.java) |

Diff for: python/find_the_difference.py

@@ -0,0 +1,17 @@
+from typing import Dict
+
+
+class Solution:
+    def get_character_frequency(self, string: str) -> Dict[str, int]:
+        frequency = {}
+        for character in string:
+            frequency[character] = frequency.get(character, 0) + 1
+        return frequency
+
+    def findTheDifference(self, s: str, t: str) -> str:
+        characters_s = self.get_character_frequency(s)
+        for character in t:
+            if characters_s.get(character, 0) == 0:
+                return character
+            else:
+                characters_s[character] -= 1