I'm fairly new to the quant finance space, and I was hoping to get some guidance. Say I have a csv/excel file with columns of daily returns data for various asset classes or securities (one column per asset). I want to be able to import these returns data into Python, probably as lists/arrays.
If there are many days worth of data (say 10 years worth), what's the best way to go about this, import-wise and data structure-wise? Any packages that could help?
A minor note, I was considering using dictionaries so I could still retain the date/day, whereas if I just use lists I would just index it as 1,2,3,4...n_th day.