Basic usage of Python packages and classes

Create a folder Filepackage
Create __init__.py within the Filepackage folder
With __init__.py, Filepackage is a package, otherwise it is just a normal folder.

Create file.py within the Filepackage folder
The file.py code is as follows:

#!/usr/bin/env Python3#-*-Coding:utf-8-*- fromDatetimeImportDatetime class MyFile():     def __init__(self, filepath):Print' MyFile init ... ') Self.filepath = FilePath def printfilepath(self):Print (Self.filepath) def testreadfile(self):         withOpen (Self.filepath,' R ') asF:s = F.read () print (' open for read ... ') print (s) def testwritefile(self):         withOpen' Test.txt ',' W ') asF:f.write (' Today is ') F.write (DateTime.Now (). Strftime ('%y-%m-%d '))

The __init__.py code is as follows:

fromimport MyFile

The common class method inside this module is leaking out

Then the outside reference does not have to find the actual location, to find the __init__ of the package is good

Establish main.py and filepackage-lateral,
The main.py code is as follows:

#!/usr/bin/env python3# -*- coding: utf-8 -*-fromimport MyFileif‘__main__‘:    a = MyFile("./filePackage/test.txt")    a.printFilePath();    a.testReadFile();

Directory structure:

If __init__.py not write anything, then in the main.py can also write:

import filePackage.fileif‘__main__‘:    a = filePackage.file.MyFile("./filePackage/test.txt")    a.printFilePath();

However, it is not recommended to do so, and it is recommended to expose the common classes in the module as described above and refer directly to them.

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Basic usage of Python packages and classes