solution to both problems

01-ArticleViews-I.py

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+# Problem 1 : Article Views I	(	https://leetcode.com/problems/article-views-i/  )
+
+import pandas as pd
+
+def article_views(views: pd.DataFrame) -> pd.DataFrame:
+    df = views[views['author_id']==views['viewer_id']]\
+        .drop_duplicates(subset=['author_id'])\
+        .sort_values(by=['author_id'])\
+        .rename(columns={'author_id':'id'})[['id']]
+    return df
+
+#May be a bit faster on large datasets since it avoids creating a NumPy array
+
+def article_views(views: pd.DataFrame) -> pd.DataFrame:
+
+    df = views[views['author_id']==views['viewer_id']]
+    df = df['author_id'].unique()
+    df = pd.DataFrame(df, columns=['id'])
+    return df.sort_values(by=['id'])

02-InvalidTweets.py

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+#Problem 2 :Invalid Tweets	(	https://leetcode.com/problems/invalid-tweets/ )
+
+import pandas as pd
+
+def invalid_tweets(tweets: pd.DataFrame) -> pd.DataFrame:
+    df = tweets[ tweets['content'].str.len() >15 ][['tweet_id']]
+    return df