Dev2Py

Django ORM – Insert, Update & Delete Data Introduction : At Dev2py, we are committed to providing you with the best resources to learn and excel in web development. In this article, we will discuss how to insert, update, and delete data using Django's ORM, and how to optimize your database operations to improve your web application's performance. Inserting Data Inserting data into a database using Django's ORM is a straightforward process. You start by defining your data model, which is essentially a blueprint for your database table. Once you have defined your model, you can use the ORM's create method to insert data into the database. For example, let's say we have a model called Student with fields name, age, and grade. We can insert a new student into the database as follows: python Copy code from myapp.models import Student s = Student.objects.create(name='Hari', age=20, grade='A') Updating Data Updating data in Django's ORM is just as e...

Extract audio from video using python step by step  Method -1 To extract audio from a video file using Python, you can use the pydub library. The following is a step-by-step process to extract audio from a video file: Install the pydub library by running the following command in your terminal or command prompt:      pip install pydub Import the required modules: python Copy code      from pydub import AudioSegment Load the video file using the AudioSegment.from_file method: python Copy code     video = AudioSegment.from_file ( " video.mp4 " , format = " mp4 " ) Use the export method to save the audio as a separate file: python Copy code     video.export ( " audio.wav " , format = " wav " ) Here is the complete code: python Copy code     from pydub import AudioSegment     video = AudioSegment.from_file ( " video.mp4 " ,      format = " mp4 " )     video.export ( " audio.wav " , form...

Compress PDF using python step by step  1. Method Here's a step-by-step guide to compress a PDF file using Python: Install the PyPDF2 library:         pip install PyPDF2 Import the PyPDF2 library in your Python script: python            pip install Py   pip Copy code         import PyPDF2 Open the PDF file you want to compress: makefile        pdf_file = open ( " original.pdf " , " rb " )    pdf_reader = PyPDF2.PdfFileReader ( pdf_file ) Create a new PDF file to store the compressed version: makefile Copy code       pdf_writer = PyPDF2.PdfFileWriter () Loop through each page of the original PDF file and add it to the new PDF file, setting the compression level: scss   for page_num in range ( pdf_reader.numPages ) :     page = pdf_reader.getPage ( page_num )     page.compressContentStreams ()     pdf_writer.addPage ( page )...

Here's a step-by-step example of how to merge multiple PDFs using PyMuPDF (fitz) in Python: Install the fitz library: Copy code pip install PyMuPDF Import the fitz library in your Python script: python Copy code import fitz Create a new fitz PDF object to store the merged PDF: python Copy code merger = fitz.open() Loop through the list of PDFs you want to merge: sql Copy code pdf_list = ['file1.pdf', 'file2.pdf', 'file3.pdf'] for pdf in pdf_list:     # Open each PDF     doc = fitz.open(pdf)     # Insert the contents of each PDF into the merger     merger.insert_pdf(doc)     # Close the PDF     doc.close() Save the merged PDF to a file: python Copy code merger.save("output.pdf") The complete code would look like this: python Copy code import fitz def merge_pdfs(pdf_list, output):     # Create a PDF object to write the merged PDF to     merger = fitz.open()     # Loop through all PDFs in the list ...

YouTube video download using python step by step  Here's an example of how to download a video from YouTube using Python: Install the pytube library using pip: Copy code pip install pytube Import the pytube library in your Python script: Copy code from pytube import YouTube Create a YouTube object with the video URL: Copy code yt = YouTube("https://www.youtube.com/watch?v=dQw4w9WgXcQ") Select the video stream with the desired resolution and file type: Copy code stream = yt.streams.filter(progressive=True, file_extension='mp4').first() Download the video: Copy code stream.download() This will download the video in the current working directory with the highest resolution and the file type mp4. You can also use other libraries such as pafy,youtube_dl and etc. You may also want to customize the video quality, file format, and other properties of the video. The pytube library provides many options for customizing the properties of the video, check the docu...

YouTube video to mp3 download using python step by step  Here's an example of how to download the audio of a YouTube video as an MP3 file using Python: Install the pytube and pydub libraries using pip: Copy code pip install pytube pydub Import the pytube and pydub libraries in your Python script: Copy code from pytube import YouTube from pydub import AudioSegment Create a YouTube object with the video URL: Copy code yt = YouTube("https://www.youtube.com/watch?v=dQw4w9WgXcQ") Select the audio stream with the desired file type: Copy code audio_stream = yt.streams.filter(only_audio=True, file_extension='mp4').first() Download the audio stream to a file: Copy code audio_stream.download() Use the pydub library to convert the audio stream from mp4 to mp3: Copy code audio = AudioSegment.from_file("audio_stream.mp4", format="mp4") audio.export("audio_stream.mp3", format="mp3") This will download the audio of the video in...

Language Translator using python step by step  Here's an example of how to translate text using Python: Install the googletrans library using pip: Copy code pip install googletrans Import the googletrans library in your Python script: Copy code from googletrans import Translator Create an instance of the Translator object: Copy code translator = Translator() Use the translate() function to translate text: Copy code text = "Hello World!" translation = translator.translate(text, dest='fr') print(translation.text) This will output "Bonjour le monde!" which is the French translation of "Hello World!". The dest parameter of the translate() function is used to specify the target language. You can use any language code that is supported by the Google Translate API. You can also use other libraries such as googletransx,translate and etc. Please note that the googletrans library uses the Google Translate API to translate text, and you need t...

Pdf to document type using python  Here is a step-by-step guide on how to convert a PDF file to a text document using Python and the PyPDF2 library: Install the PyPDF2 library by running pip install pypdf2 in your command line. Create a new Python script and import the PyPDF2 library by adding the following line at the top of your script: import PyPDF2 Open the PDF file using the open() function. You will need to specify the file path and the mode "rb" (read binary) as an argument. Here's an example of how to do this: Copy code with open("example.pdf", "rb") as file:     pdf = PyPDF2.PdfFileReader(file) Iterate over each page of the PDF using a for loop and the numPages attribute of the PdfFileReader object. Extract the text from each page using the getPage() method and the extractText() method. Here's an example of how to do this: Copy code for page in range(pdf.numPages):         text = pdf.getPage(page).extractText() Create a...