read csv file and extract columns named log

def extract_from_file(filename):
  f = open(filename, 'r')
  lines = f.readlines()
  f.close
  
  logs = []
  for line in lines:
    log = line.split(',')
    log = [log[0], log[1].rstrip('\n')]
    logs.append(log)
  
  return logs