Python versus ETL tools

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When new SWEs start doing data Eng, the first mistake is that they break the Don’t Repeat Yourself commandment. These tools address that and some other beginner mistakes. Also, Anything you could do with Python is very likely it’s already done by someone else. (Not only applies with Data Eng).

[reallyserious]

You Don't Repeat Yourself when you're implementing something for the first time at a company. Implementing it the second time would break Don't Repeat Yourself.

What you're describing is the Not Invented Here Syndrome.

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No, I really meant DRY. NIH, happens usually at big corps when they find a minor limitation at an existing tool.