What are key concepts in python I need to focus for data engineering and data science. I did lot of coding in C at start of my career but haven't coded in last 8 yrs. I am data engineering architect and now given shift in technology landscape trying to pickup spark, python so I can architect solutions on cloud. Any udemy courses , online resources folks can recommend

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You could get certified for AWS / GCP/ Azure / Oracle. I know there are specialities focused on data engineering specifically and we are sponsoring vouchers.

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PySpark, Pandas, and Koalas. Learn lambda functions inside and out. Learn at least one framework. Learn how to validate data types in a language that refuses to cast types... Learn how to call to r or sql or scala code...

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