import statistics

def clean(csv_list):
  a = csv_list.split(',')
  print(a)
  b =[]
  for i in a:
    i = i.replace("'",'')
    print(i)
    if(i is 'None' or i is''):
      continue
    try:
        print(int(i))
        b.append(int(i))
    except:
        continue
  return b


def get_stats(csv_string):
  valid = clean(csv_string)
  return (len(valid),statistics.stdev(valid),statistics.mean(valid))