Replace a cell in a column based on a cell in another column in a polars DataFrame

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Replace a cell in a column based on a cell in another column in a polars DataFrame
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(stackoverflow.com/users/6930340/andi)Andi
(stackoverflow.com/users/12978930/hericks)Hericks
(stackoverflow.com/users/19355181/jqurious)jqurious
(stackoverflow.com/users/16343464/mozway)mozway
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