| Tutorial | Python |

QR Code Generation with Python

To generate a QR code in Python, you can use the qrcode library.

Steps to Generate a QR Code with qrcode

1. Install the qrcode Library

To get started, we need to install the qrcode library. If you don’t have it installed yet, you can easily do so using pip.
We’ll also install the pillow library, which is used for working with images.

Open your terminal and run:

pip install qrcode[pil]

2. Python Code to Generate a QR Code

Now, let’s create a Python script to generate a QR code.

import qrcode

# Data for the QR code
data = "https://www.djc.pe/"  # Link or text you want to encode

# Create the QR object
qr = qrcode.QRCode(
    version=1,  # Controls the size of the QR (1 to 40)
    error_correction=qrcode.constants.ERROR_CORRECT_L,  # Error correction level
    box_size=10,  # Size of each square in the QR code
    border=4,  # Border thickness
)
qr.add_data(data)
qr.make(fit=True)

# Create the QR image
img = qr.make_image(fill_color="black", back_color="white")

# Save the image
img.save("codigo_qr.png")

print("QR code generated and saved as 'codigo_qr.png'!")

Code Explanation

  • Data to encode: In the data variable, we place the URL or text we want to encode. You can change this to any other data.
  • Create the QR object: We use qrcode.QRCode() to create a QR object. Parameters like version, error_correction, box_size, and border allow us to customize the size, error correction level, and appearance of the QR code.
  • Add the data: The add_data() method is where we add the information to be encoded. The make(fit=True) method adjusts the QR code according to the provided data.
  • Generate the image: We use make_image() to create the QR code image. Here, you can specify the QR colors (fill for the squares, back_color for the background).
  • Save and display the image: Finally, the image is saved with img.save("codigo_qr.png") and displayed using img.show().

QR Code Customization

  • Size: The version parameter determines the size of the QR code. The larger the value, the bigger the code. Valid values range from 1 to 40.

  • Error correction: The error correction level can be adjusted with the error_correction parameter. Available levels are:

  • ERROR_CORRECT_L: 7% error correction

  • ERROR_CORRECT_M: 15% error correction
  • ERROR_CORRECT_Q: 25% error correction
  • ERROR_CORRECT_H: 30% error correction
  • Colors: You can customize the QR code colors using the fill parameter for the squares and the back_color parameter for the background.

| Tutorial | Python |