Python qrcode module – All you need to know!

Filed Under: Python Modules
Python Qrcode Module

Hello, readers. This article talks about Python qrcode module. We will be guiding you through the process of creating a customized qrcode for various purposes.

So, let us begin! 馃檪


Understanding the use of QR code

Back in the days when we had to perform payments in cash, or even have data stored on papers, nobody ever had thought that today all of these time-consuming processes would be replaced by just a single scan.

In the current scenarios, for every important transaction, OR code does the information collection. QR code has come up as a savior for us depicting automation.

QR code stands for Quick Response. As the word depicts, they have the capability to give quick responses by storing a large amount of data within it. Also, when we scan the QR code, it helps us achieve information about a particular entity at ease.

QR stores all the data that we programmatically feed into it in the form of pixels in a proper square-shaped box/grid structure.

To relate to the current scenario, QR codes have been extensively used in the below markets-

  1. Easy Payements through QR code. The payement details gets stored into the QRcode in the form of pixels.
  2. Attendance management through QR. The link of a responsive webpage to mark the attendance is stored in the QR.
  3. Information about a product can be read and attained through the QRcode attached along with the products in the market.

Implementing creation of qrcode in Python

Python offers us with qrcode module to generate customized and user-defined QR codes at ease.

We need to install the module using the below command:

Installing qrcode module
Installing qrcode module

At first, we import the qrcode module using the import attribute of Python. Once it is imported, we then need to associate an object with the module to make use of the functions in the module.

We will be making use of the below functions offered by the qrcode module to generate a QR code:

  1. add_data() function: With this function, we will be passing all the data that needs to go in the QR code.
  2. make() function: Once we input the data, now is the time to generate the QR code with make() function.
  3. make_image() function: Even though the make() function generates the QR code, it actually does not generate an image. So, with make_image() function, we can generate images of QR codes.
  4. save() function: It saves the generated OR code.

Example:

import qrcode
qr_obj = qrcode.QRCode()
qr_obj.add_data('Welcome to Journaldev!!')
qr_obj.make()
qr_img = qr_obj.make_image()
qr_img.save('C:\Users\HP\OneDrive\Desktop\qr.png')

Output:

QR code
QR code

When we try to scan the above QR code through any scanning device or our mobile, it should return the text as shown below:

Data depicted by QR code
Data depicted by QR code

Creating a Customized qrcode in Python

Using the functions in the above section, we can create a basic and a standard QR code for use. But what if we wish to use a more customized form of QR?

This can be achieved by the addition of certain properties to the QR creation.

  1. We can customize the size of the QR code from 1-40 using the version attribute.
  2. We can add parameters such as fill_color, back_color, etc to customize the look of the QR code.
  3. The number of pixcels can be customized using box_size attribute.

Example:

import qrcode
qr_obj = qrcode.QRCode(version=3,box_size=18)
qr_obj.add_data('Welcome folks!')
qr_obj.make()
qr_img = qr_obj.make_image(fill_color="green", back_color="grey")
qr_img.save('C:/Users/HP/OneDrive/Desktop/custom_qr.png')

Output:

As seen above, we have created a customized QR code giving it a green look with a grey background and a maximized size.

Customized QR code
Customized QR code

Conclusion

By this, we have come to the end of this topic. Feel free to comment below, in case you come across any questions.

For more such posts related to Python, Stay tuned with us.

Till then, Happy Learning!! 馃檪

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