>>> import os
>>> os.chdir("D:\\")
>>> os.getcwd()
'D:\\'
>>> os.listdir(".")
......

1
100
3000
56
34
23
 oi 

>>> from class_format import FormatData
>>> myInstance = FormatData()
>>> read_material = myInstance.ReadData("testcsv.txt")
Data read!
>>> read_material
[1.0, 100.0, 3000.0, 56.0, 34.0, 23.0, 'oi']
>>> result = myInstance.SaveData("resultcsv.txt",read_material)
Data saved!

#!/usr/bin/python
""" Chapter 15 of Beginning Programming With Python - For Dummies   """
import csv
class FormatData:
  def __init__(self, Name="",Age=0, Using_Vim=False):
    self.Name = Name
    self.Age = Age
    self.VimUser = Using_Vim
  def __str__(self):
    OutString = "'{0}', {1}, {2}".format(self.Name, self.Age, self.VimUser)
    return OutString
  def SaveData(self, Filename = "", DataList = []):
    with open(Filename, "w") as csvfile:
      DataWriter = csv.writer(csvfile, delimiter='\n',quotechar=" ",quoting=csv.QUOTE_NONNUMERIC)
      DataWriter.writerow(DataList)
      csvfile.close()
      print("Data saved!")
  def ReadData(self,Filename=""):
    with open(Filename, "r") as csvfile:
      DataReader = csv.reader(csvfile, delimiter='\n',quotechar=" ",quoting=csv.QUOTE_NONNUMERIC)
      Output = []
      for Item in DataReader:
        Output.append(Item[0])
      csvfile.close()
      print("Data read!")
      return Output