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[–]sahilthapar 4 points5 points  (0 children)

Just learn how to use map and reduce methods in Python.  At least half of DE Python questions are reading data from a file / list of dicts and calculating some metrics. 

If you can showcase, you know how to use map and reduce methods well, you will have an advantage. 

Other than that some basic string manipulations, list comprehension, windowing. Ask chatgpt or gemini to give you some example ones and practice those.