Python のパッケージとクラスの使用方法

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

from datetime import datetime

class MyFile():

 def __init__(self, filepath):
  print('MyFile init...')
  self.filepath = filepath

 def printFilePath(self):
  print(self.filepath)

 def testReadFile(self):
  with open(self.filepath, 'r') as f:
   s = f.read()
   print('open for read...')
   print(s)

 def testWriteFile(self):
  with open('test.txt', 'w') as f:
   f.write('今天是 ')
   f.write(datetime.now().strftime('%Y-%m-%d'))

from file import MyFile

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

from filePackage import MyFile

if __name__ == '__main__':
 a = MyFile("./filePackage/test.txt")
 a.printFilePath();
 a.testReadFile();

import filePackage.file
if __name__ == '__main__':
 a = filePackage.file.MyFile("./filePackage/test.txt")
 a.printFilePath();