Merge pull request #612 from realpython/polars-missing-data

Initial Commit for first TR - attempt 1

Author: brendaweles

polars-missing-data/README.md

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+These files will allow you to work along with the [How to Deal With Missing Data in Polars](https://realpython.com/how-to-deal-with-polars-missing-data/) tutorial.
+
+The files are:
+
+tutorial_code.ipynb	 - Contains the code you see in the tutorial.
+tips.parquet		 - Parquet file containing tips information.
+sales_trends.csv	 - CSV file containing sales trend data.
+ft_exercise.parquet	 - Parquet file containing data used in the comprehension exercise.
+ft_exercise_solution.csv - Parquet file containing the solution to the comprehension exercise.
+

polars-missing-data/ft_exercise.parquet

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+episode,series,title,original_date
+1,1,A Touch of Class,1975-09-19
+2,1,The Builders,1975-09-26
+3,1,The Wedding Party,1975-10-03
+4,1,The Hotel Inspectors,1975-10-10
+5,1,Gourmet Night,1975-10-17
+6,1,The Germans,1975-10-24
+7,2,Communication Problems,1979-02-19
+8,2,The Psychiatrist,1979-02-26
+9,2,Waldorf Salad,1979-03-05
+10,2,The Kipper and the Corpse,1979-03-12
+11,2,The Anniversary,1979-03-26
+12,2,Basil the Rat,1979-10-25

polars-missing-data/ft_exercise_solution.csv

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+product,last_year,current_year,next_year
+A,17,19,29.0
+B,35,35,NaN
+C,21,19,
+D,42,50,-inf
+E,23,25,inf