Python: How to code an exponential moving average?

Question

I want to do calculations on three columns of a dataframe df. In order to do that I want run a price of assets (cryptocurrencies) list in a three column table i

Answer 1

In your loop for i,column in enumerate(column_by_search): you iterate over the elements in your column_by_search list, that is column takes on the values "BTC", "ETH", "DASH" in turn. Thus, len(column) will give you the length of the string "BTC", which is 3 in fact.

Try df[column] instead, that will return a list with the elements in the desired column and you can iterate over it.