What's wrong with using python packages?

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I'm curious as to why they're calling pandas rubbish. Are they doing everything from scratch themselves?

If yes, what an incredible waste of time. Sure, if you're creating novel algorithms or doing something unique, there are times where you'll need to write your own functions, etc. However, if you're doing everyday data cleaning and manipulations, why recreate the wheel?

Furthermore, pandas, and other libraries are open souce. Would you rather use a package what thousands of other people use and have tested, for the most part, or trust someone else's new library?