solves isomorphic strings in python

Author: anishLearnsToCode

README.md

@@ -59,7 +59,7 @@
 | 202 | [Happy Number](https://leetcode.com/problems/happy-number) | Easy | [![Java](https://img.icons8.com/color/40/000000/java-coffee-cup-logo.png)](src/HappyNumber.java) [![Python](https://img.icons8.com/color/35/000000/python.png)](python/happy_number.py) | 
 | 203 | [Remove Linked List Elements](https://leetcode.com/problems/remove-linked-list-elements) | Easy | [![Java](https://img.icons8.com/color/40/000000/java-coffee-cup-logo.png)](src/RemoveLinkedListElements.java) [![Python](https://img.icons8.com/color/35/000000/python.png)](python/remove_linked_list_elements.py) |
 | 204 | [Count Primes](https://leetcode.com/problems/count-primes) | Easy | [![Java](https://img.icons8.com/color/40/000000/java-coffee-cup-logo.png)](src/CountPrimes.java) [![Python](https://img.icons8.com/color/35/000000/python.png)](python/count_primes.py) |
-| 205 | [Isomorphic Strings](https://leetcode.com/problems/isomorphic-strings) | Easy | [![Java](https://img.icons8.com/color/40/000000/java-coffee-cup-logo.png)](src/IsomorphicStrings.java) |
+| 205 | [Isomorphic Strings](https://leetcode.com/problems/isomorphic-strings) | Easy | [![Java](https://img.icons8.com/color/40/000000/java-coffee-cup-logo.png)](src/IsomorphicStrings.java) [![Python](https://img.icons8.com/color/35/000000/python.png)](python/isomorphic_strings.py) |
 | 206 | [Reverse Linked Lists](https://leetcode.com/problems/reverse-linked-list) | Easy | [![Java](https://img.icons8.com/color/40/000000/java-coffee-cup-logo.png)](src/ReverseLinkedList.java) |
 | 217 | [Contains Duplicate](https://leetcode.com/problems/contains-duplicate) | Easy | [![Java](https://img.icons8.com/color/40/000000/java-coffee-cup-logo.png)](src/ContainsDuplicate.java) |
 | 219 | [Contains Duplicate II](https://leetcode.com/problems/contains-duplicate-ii) | Easy | [![Java](https://img.icons8.com/color/40/000000/java-coffee-cup-logo.png)](src/ContainsDuplicateII.java) |

python/isomorphic_strings.py

@@ -0,0 +1,17 @@
+from typing import Dict
+
+
+class Solution:
+    def isIsomorphic(self, s: str, t: str) -> bool:
+        mapping = {}
+        mapped_chars = set()
+        for char_s, char_t in zip(s, t):
+            if char_s in mapping:
+                if mapping[char_s] != char_t:
+                    return False
+            else:
+                if char_t in mapped_chars:
+                    return False
+                mapping[char_s] = char_t
+                mapped_chars.add(char_t)
+        return True