How to generate QR codes in Python?
May 21, 2025 pm 09:39 PMYou can use the qrcode library to generate QR code in Python. 1. Install the qrcode library: pip install qrcode[pil]. 2. Create a QRCode object and add data: qr = qrcode.QRCode(version=1, error_correction=qrcode.constants.ERROR_CORRECT_L, box_size=10, border=4); qr.add_data('https://example.com'); qr.make(fit=True). 3. Generate and save the image: img = qr.make_image(fill_color="black", back_color="white"); img.save("example_qr.png").
Generating QR codes in Python is fun and practical, especially when it is necessary to quickly generate scanable QR codes. Let me introduce in detail how to implement this function and some points that need to be paid attention to in actual applications.
Generating QR codes in Python mainly relies on a library called qrcode
. This library is powerful and easy to use and can quickly generate various types of QR codes. You may be wondering, why use Python to generate QR codes? Because Python has a rich ecosystem and many libraries for processing images and data, this makes generating QR codes simple and efficient.
To start using the qrcode
library, you need to install it first. This can be done easily with the pip
command:
pip install qrcode[pil]
Here I recommend the installation pil
(Python Imaging Library) option because it allows us to perform more customization operations on the generated QR code, such as resizing, adding colors, etc.
OK, after installing the library, we can start generating the QR code. Here is a simple example showing how to generate a QR code containing a URL:
import qrcode # Create a QRCode object qr = qrcode.QRCode( version=1, error_correction=qrcode.constants.ERROR_CORRECT_L, box_size=10, border=4, ) # Add data to QRCode object qr.add_data('https://example.com') qr.make(fit=True) # Create an Image object img = qr.make_image(fill_color="black", back_color="white") # Save the image img.save("example_qr.png")
This snippet shows how to generate a QR code containing the URL and save it as a PNG file. Let's take a look at some details in the process:
- Version : The version of the QR code determines its size and storage capacity. Version 1 is the smallest, version 40 is the largest.
- Error correction level (error_correction) : QR code supports four error correction levels: L (7%), M (15%), Q (25%), and H (30%). Choosing the right level ensures that the QR code can be scanned even if partially damaged.
- Box size (box_size) and border : These parameters control the visual performance of the QR code.
In practical applications, you may encounter some common problems, such as the generated QR code cannot be scanned, or more information needs to be embedded in the QR code. Here are some suggestions and experiences:
- Improve error correction level : If you are worried that QR code will be damaged, increasing error correction level can increase its readability.
- Resize : Sometimes the generated QR code is too small to scan, and adjusting
box_size
appropriately can solve this problem. - Embed more information : QR codes can contain text, URL, contact information, etc., and adjust the data format as needed.
Here are some suggestions for performance optimization and best practices:
- Batch Generation : If you need to generate a large amount of QR code, consider using batch scripts to improve efficiency.
- Caching : If the content of the QR code does not change frequently, it can be cached after generation to avoid repeated generation.
- Custom style : Use the
pil
option to add colors, logos, etc. to make the QR code more personalized, but be careful not to affect the scanning effect.
Overall, the qrcode
library in Python provides a simple and powerful way to generate QR codes. By placing the parameters rationally and applying best practices, you can generate QR codes that meet your needs. Hope these sharing will help you better use this tool in your actual project.
The above is the detailed content of How to generate QR codes in Python?. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undress AI Tool
Undress images for free

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Identifying the trend of the main capital can significantly improve the quality of investment decisions. Its core value lies in trend prediction, support/pressure position verification and sector rotation precursor; 1. Track the net inflow direction, trading ratio imbalance and market price order cluster through large-scale transaction data; 2. Use the on-chain giant whale address to analyze position changes, exchange inflows and position costs; 3. Capture derivative market signals such as futures open contracts, long-short position ratios and liquidated risk zones; in actual combat, trends are confirmed according to the four-step method: technical resonance, exchange flow, derivative indicators and market sentiment extreme value; the main force often adopts a three-step harvesting strategy: sweeping and manufacturing FOMO, KOL collaboratively shouting orders, and short-selling backhand shorting; novices should take risk aversion actions: when the main force's net outflow exceeds $15 million, reduce positions by 50%, and large-scale selling orders

1. Download and install the application through the official recommended channel to ensure safety; 2. Access the designated download address to complete the file acquisition; 3. Ignore the device safety reminder and complete the installation as prompts; 4. You can refer to the data of mainstream platforms such as Huobi HTX and Ouyi OK for market comparison; the APP provides real-time market tracking, professional charting tools, price warning and market information aggregation functions; when analyzing trends, long-term trend judgment, technical indicator application, trading volume changes and fundamental information; when choosing software, you should pay attention to data authority, interface friendliness and comprehensive functions to improve analysis efficiency and decision-making accuracy.

First, select well-known platforms such as Binance Binance or Ouyi OKX, and prepare your email and mobile phone number; 1. Visit the official website of the platform and click to register, enter your email or mobile phone number and set a high-strength password; 2. Submit information after agreeing to the terms of service, and complete account activation through the email or mobile phone verification code; 3. Complete identity authentication (KYC) after logging in, enable secondary verification (2FA) and check security settings regularly to ensure account security. After completing the above steps, you can successfully create a BTC digital currency account.

In the digital currency market, real-time mastering of Bitcoin prices and transaction in-depth information is a must-have skill for every investor. Viewing accurate K-line charts and depth charts can help judge the power of buying and selling, capture market changes, and improve the scientific nature of investment decisions.

1. First, ensure that the device network is stable and has sufficient storage space; 2. Download it through the official download address [adid]fbd7939d674997cdb4692d34de8633c4[/adid]; 3. Complete the installation according to the device prompts, and the official channel is safe and reliable; 4. After the installation is completed, you can experience professional trading services comparable to HTX and Ouyi platforms; the new version 5.0.5 feature highlights include: 1. Optimize the user interface, and the operation is more intuitive and convenient; 2. Improve transaction performance and reduce delays and slippages; 3. Enhance security protection and adopt advanced encryption technology; 4. Add a variety of new technical analysis chart tools; pay attention to: 1. Properly keep the account password to avoid logging in on public devices; 2.

Binance provides bank transfers, credit cards, P2P and other methods to purchase USDT, USDC and other stablecoins, with fiat currency entrance and high security; 2. Ouyi OKX supports credit cards, bank cards and third-party payment to purchase stablecoins, and provides OTC and P2P transaction services; 3. Sesame Open Gate.io can purchase stablecoins through fiat currency channels and P2P transactions, supporting multiple fiat currency recharges and convenient operation; 4. Huobi provides fiat currency trading area and P2P market to purchase stablecoins, with strict risk control and high-quality customer service; 5. KuCoin supports credit cards and bank transfers to purchase stablecoins, with diverse P2P transactions and friendly interfaces; 6. Kraken supports ACH, SEPA and other bank transfer methods to purchase stablecoins, with high security

First, choose a reputable digital asset platform. 1. Recommend mainstream platforms such as Binance, Ouyi, Huobi, Damen Exchange; 2. Visit the official website and click "Register", use your email or mobile phone number and set a high-strength password; 3. Complete email or mobile phone verification code verification; 4. After logging in, perform identity verification (KYC), submit identity proof documents and complete facial recognition; 5. Enable two-factor identity verification (2FA), set an independent fund password, and regularly check the login record to ensure the security of the account, and finally successfully open and manage the USDT virtual currency account.

Ouyi APP is a professional digital asset service platform dedicated to providing global users with a safe, stable and efficient trading experience. This article will introduce in detail the download method and core functions of its official version v6.129.0 to help users get started quickly. This version has been fully upgraded in terms of user experience, transaction performance and security, aiming to meet the diverse needs of users at different levels, allowing users to easily manage and trade their digital assets.
