Basic usage of Python packages and classes, and Python package usage

Basic usage of Python packages and classes, and Python package usage

Create a folder filePackage
Create _ init _. py in the filePackage folder.
With _ init _. py, filePackage is regarded as a package; otherwise, it is only a normal folder.

Create file. py in the filePackage folder
The file. py code is as follows:

#! /Usr/bin/env python3 #-*-coding: UTF-8-*-from datetime import datetimeclass 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 ('Today is ') f. write (datetime. now (). strftime ('% Y-% m-% D '))

The Code of _ init _. py is as follows:

from file import MyFile

Expose the common class methods in this module

Then, the reference outside does not need to find the actual location. Just find the package's _ init _.

Create a level of main. py and filePackage,
The main. py code is as follows:

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

Directory structure:

If nothing is written in _ init _. py, you can also write in main. py as follows:

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

However, it is not recommended to write this statement. We recommend that you follow the above method.Expose the public classes in the module.

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