How To Generate QR Code In Python

1 . Generating QR Codes in Python

QR codes (Quick Response codes) are two-dimensional barcodes that can be scanned and interpreted by a QR code reader. QR codes are widely used for various purposes, such as product tracking, customer engagement, and marketing. QR codes can store large amounts of data, making them a convenient way to share information.

In this article, we will be discussing how to generate QR codes in Python, with a step-by-step guide and a working example.

Prerequisites:

  1. Basic knowledge of Python
  2. Knowledge of how to install Python packages

Generating QR Codes in Python

There are several libraries available in Python to generate QR codes, but the most commonly used library is qrcode. To install the library, you can use the following command:

Step 1: Install the qrcode Library

#install qrcode lib 
pip install qrcode[pil]

Step 2: Import the Library and Create an Instance of the QR Code Class

Once you have installed the library, you can start using it to generate QR codes. In your Python script, import the qrcode library and create an instance of the QR code class with the version, box size, and border parameters.

import qrcode

qr = qrcode.QRCode(version=1, box_size=10, border=5)

The version parameter determines the size of the QR code, with higher versions allowing for more data to be stored. The box size and border parameters determine the size of each box in the QR code and the width of the border, respectively.

Step 3: Add Data to the QR Code Instance

Next, add the data to the QR code instance. In this example, we will be adding a URL as the data:

data = "https://www.example.com"
qr.add_data(data)

Step 4: Fit the Data to the QR Code Instance

After adding the data, fit the data to the QR code instance:

qr.make(fit=True)

Step 5: Create an Image of the QR Code

Next, create an image of the QR code with the make_image method. You can specify the fill color and background color of the QR code using the fill_color and back_color parameters, respectively.

Here is an example:

img = qr.make_image(fill_color="black", back_color="white")

Step 6: Save the Image

Finally, save the image to a file using the save method. In this example, we will be saving the image as a PNG file:

img.save("qr_code.png")

Here is the complete code:

#generate qr code 
import qrcode

qr = qrcode.QRCode(version=1, box_size=10, border=5)

data = "https://www.example.com"
qr.add_data(data)
qr.make(fit=True)

img = qr.make_image(fill_color="black", back_color="white")
img.save("qr_code.png")

Explanation of the code:

  1. Import the qrcode library
  2. Create an instance of the QR code class with the version, box size, and border parameters.
  3. Add the data to the QR code instance.
  4. Fit the data to the QR code instance.
  5. Create an image of the QR code with a black fill color and a white background color.
  6. Save the image as a PNG file.

You can now open the qr_code.png file to see the generated QR code.

Customizing QR Codes

You can customize QR codes by changing the parameters of the QR code instance and the image. For example, you can change the size of the QR code, the fill color, the background color, and more.

Here is an example to generate a QR code with a custom size and color:

#example 
import qrcode

qr = qrcode.QRCode(version=1, box_size=20, border=10)

data = "https://www.example.com"
qr.add_data(data)
qr.make(fit=True)

img = qr.make_image(fill_color="red", back_color="green")
img.save("qr_code_custom.png")

In this example, we increased the box size and border size and changed the fill color to red and the background color to green.

In this article, we have discussed how to generate QR codes in Python using the qrcode library. We also went through an example to generate a QR code for a URL and how to customize the QR code. QR codes are a convenient way to share information, and with the help of the qrcode library, generating QR codes in Python is easy and straightforward.

Thanks for reading. Leave comments for queries or suggestions.

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