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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 ...