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Author: Partho Biswas

README.md

@@ -230,6 +230,7 @@ I have solved quite a number of problems from several topics. See the below tabl
 |35| **[678. Valid Parenthesis String](https://tinyurl.com/y9a3g9kq)** | [Python](https://tinyurl.com/wu6rdaw/678_Valid_Parenthesis_String.py), [Swift](https://tinyurl.com/wuja3c4/678_Valid_Parenthesis_String.swift) | [Art 1](https://tinyurl.com/yad2akx6), [Art 2](https://tinyurl.com/y4odwzll), [Art 3](https://tinyurl.com/y7lkgfom), [Art 4](https://tinyurl.com/ycxpeyzn) | Medium | Super tricky. Much check again |
 |36| **[273. Integer to English Words](https://tinyurl.com/y7pps4u9)** | [Python](https://tinyurl.com/wu6rdaw/273_Integer_to_English_Words.py), [Swift](https://tinyurl.com/wuja3c4/273_Integer_to_English_Words.swift) |  | Hard | MUST check again |
 |37| **[763. Partition Labels](https://tinyurl.com/yapt4n6v)** | [Python](https://tinyurl.com/wu6rdaw/763_Partition_Labels.py), [Swift](https://tinyurl.com/wuja3c4/763_Partition_Labels.swift) |  | Medium |  |
+|38| [819. Most Common Word](https://tinyurl.com/ydhwgc33) | [Python](https://tinyurl.com/wu6rdaw/819_Most_Common_Word.py), [Swift](https://tinyurl.com/wuja3c4/819_Most_Common_Word.swift) | [Art 1](https://tinyurl.com/y7u4pzeu) | Easy |  |
 
 
 </p>

leetcode.com/python/819_Most_Common_Word.py

@@ -0,0 +1,21 @@
+import re
+
+class Solution(object):
+    def mostCommonWord(self, paragraph, banned):
+        """
+        :type paragraph: str
+        :type banned: List[str]
+        :rtype: str
+        """
+        ban = set(banned)
+        words = re.findall(r'\w+', paragraph.lower())
+        return collections.Counter(w for w in words if w not in ban).most_common(1)[0][0]
+
+
+"""
+bannedSet - for quering
+
+split the paragraph and generate only a list of lowercase words
+
+
+"""