Shulou(Shulou.com)06/03 Report--

In this issue, the editor will bring you about how to use Python to write a file compression software with graphical interface. The article is rich in content and analyzes and describes for you from a professional point of view. I hope you can get something after reading this article.

File compression and decompression are often used in our daily work and study, such as winrar, fast compression, good compression and other compression software.

When opened, the interface looks like this:

After the compression is completed, it looks like this:

After decompression, it looks like this:

Implementation and Analysis process of Python Compression Software Program

First of all, unlike commercial compression software, I have simplified the function a lot, implementing only the main compression (compression of files and folders) and decompression functions.

Python has some third-party compression and decompression libraries, I chose zipfile, compressed the files to .zip, and graphically chose pyqt5, because the translation software had been graphically implemented before, so I lazily took it and used it.

The running process of the program is (compared with the figure above):

First of all, select "compress" or "decompress" in the drop-down box, then click the "Select" button to select the file to be executed, and then click the "start" button in the lower right corner, and the software will begin to execute.

The whole process is relatively simple. It got stuck in two main places and took some time to solve.

The first jam in the Python compression program is:

In order to achieve the function of compressing files and folders, it is necessary to support the ability to select both files and folders when clicking the "Select" button in the graphical interface.

However, Qt's QFileDialog does not support such an implementation, and the controls provided can only select files or folders. It took several hours to study and consult the data, and the conclusion is to inherit the QFileDialog class, and then rewrite part of the methods of this class to achieve the function of selecting both files and folders. So I went to the pit to achieve a, and I had little knowledge of the mechanism of Qt itself, so I debugged for a long time.

The reimplemented QFileDialog class code is as follows:

Class FileDialog (QtWidgets.QFileDialog): def _ init__ (self, * args, * * kwargs): super (FileDialog, self). _ _ init__ (* args, * * kwargs) self.setOption (QtWidgets.QFileDialog.DontUseNativeDialog True) self.setFileMode (QtWidgets.QFileDialog.ExistingFiles) self.tree = self.findChild (QtWidgets.QTreeView) self._selFile =''def accept (self): inds = self.tree.selectionModel (). SelectedIndexes () self._selFile = os.path.join (str (self.directory (). AbsolutePath ()), str (inds [0]. Data ()) print (' _ selfile:') Self._selFile) self.hide () def selectedFiles (self): return self._selFile

The second Pyhthon compression program gets stuck:

I finished the whole program, tested a few without a problem, I am complacent this program is perfect. The next day I thought of it again and wanted to test it completely. after all, it was always hard to be singled out on the official account of ape-man learning. It turns out that when you compress, it will compress all the folders on your entire file path.

Take a chestnut:

For example, the path of the file to be compressed is: D:/log/nginx/access.log

Compression is: D:/log/nginx/access.zip

After decompression, the normal situation should be to restore the file to:

D:/log/nginx/access/access.log

But after decompression, it actually becomes:

D:/log/nginx/access/log/nginx/access.log

Even when the program compresses, it compresses all the directories on the file path.

This has also been debugged for a long time, and at first I thought that I had passed the file path wrong.

As a result, I have not studied the use of zipfile clearly. Examples of errors are as follows:

Z = zipfile.Zipfile ('DGINGINGINAGINGINGING) z.write (' DGN _ GINXAGINGING _ access. Log') z.close ()

This will compress all the directories on the file path. The correct usage is:

Z = zipfile.Zipfile ('DGLOGUAGUBG nginxAccess.zip') z.write (' DGLOGUAGUBG nginxAccess.log') z.close ()

Why didn't the test find this problem the day before?

Because I tested the path of the file to be compressed as follows: D:/access.log

The file is under the root directory, and there are no other directories on the file path, so you can't find it.

This also tells us that the test must be multi-angle, multi-scene testing.

Two Python source files, more than 200 lines of code done, once again sigh that using Python is convenient.

Package the Python compression program into an exe file

You can also use pyinstaller to package the program into an exe file, and you can send the exe file to other friends. Their computers can run this program without a Python development environment. Of course, for the sake of program stability, you'd better test it on several computers.

Package command:

Pyinstaller-F-w-I icon.ico transdocx.py

Python Compressor file structure:

A zip_main.py file (graphical interface), a zip_console.py file (compression function), the development of graphical interface programs are usually like this, the graphical interface part and the business function part to separate, do not interfere with each other, but also easy to modify later.

Program running method: python zip_main.py

The deficiency of Python Compression Program

1. This program can only compress and extract zip files and does not support rar and tar.

two。 There is no strict fault tolerance.

3. Encryption, compression and decompression are not supported

The above is the editor for you to share how to use Python to write a file compression software with a graphical interface, if you happen to have similar doubts, you might as well refer to the above analysis to understand. If you want to know more about it, you are welcome to follow the industry information channel.

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