A python program that searches for CSV files  in a given folder. Calculates the percentage change between two columns and adds these values (percentage change) as another column in the CSV file. Without using Pandas. I am struggling to figure out how to go about this without using Pandas. So far this is what I have.

 

For search:

 

import os

directory = os.path.join("c:\\","path")
for root,dirs,files in os.walk(directory):
    for file in files:
       if file.endswith(".csv"):
           f=open(file, 'r')
           #  this is where I would perform the calculations into the CSV files
           f.close()

 

Please help me