Python completes a detailed introduction to reading and saving file classes-Python Tutorial-php.cn

Python completes a detailed introduction to reading and saving file classes

黄舟

Release： 2017-05-15 10:35:30

Original

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这篇文章主要介绍了Python实现读取并保存文件的类,涉及Python针对文件的读写操作相关实现技巧,需要的朋友可以参考下

本文实例讲述了Python实现读取并保存文件的类。分享给大家供大家参考，具体如下：

这个类写在一个叫class_format.py 的文件里，放在D盘

>>> import os
>>> os.chdir("D:\\")
>>> os.getcwd()
&#39;D:\\&#39;
>>> os.listdir(".")
......

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有一个testcsv.txt 文件放在D盘，内容如下（oi的两边有空格）：

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这个代码的ReadData模块用到了csv.reader这个方法，delimiter='\n' 表示分隔符为换行符，quotechar=" " 表示引用字符为空格，quoting=csv.QUOTE_NONNUMERIC 表示，reader把未引用的区域转换为float类型， writer把非数值的字段用字符引用。

这个模块使用方法：

>>> 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, &#39;oi&#39;]
>>> result = myInstance.SaveData("resultcsv.txt",read_material)
Data saved!

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这样testcsv.txt中的内容就被写入 resultcsv.txt文件中了

代码如下：

#!/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 = "&#39;{0}&#39;, {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=&#39;\n&#39;,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=&#39;\n&#39;,quotechar=" ",quoting=csv.QUOTE_NONNUMERIC)
      Output = []
      for Item in DataReader:
        Output.append(Item[0])
      csvfile.close()
      print("Data read!")
      return Output

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