Alec  Nikolaus

Alec Nikolaus

1596695100

How to create your own QR code programmatically

QR code is quite popular today. We see them everywhere. Ever curious how QR code works and how we can create them?

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Photo by Hillary Black on Unsplash

S

tanding for “Quick Response code”, QR code is a code that is quickly readable by a cell phone (taking only 1–2 seconds to be processed). It has a wide range of uses across all types of industries such as retail, marketing, and logistics. QR code is a type of matrix barcode (or two-dimensional barcode) first designed in 1994 for the automotive industry in Japan, that used four standardized encoding modes (numeric, alphanumeric, byte/binary, and kanji) to store data efficiently (extensions may also be used). When we look at it, we see black squares arranged in a square grid on a white background, which can be read by an imaging device such as a camera, and processed using Reed–Solomon error correction until the image can be appropriately interpreted. The required data is then extracted from patterns that are present in both horizontal and vertical components of the image.

While QR Codes and Barcodes are similar in practice, QR Codes contain more information because they have the ability to hold information both horizontally and vertically. Barcodes only use horizontal information. While Barcodes work wonderfully for situations like scanning supermarket items, QR Codes have a much higher capability of transferring information, likely what has made them increasingly popular due to their versatility.


So how do we create QR-code

An easy approach would be to go to a website or mobile application that has the functionality support users to create QR code. The sites or mobile application can be :

  • The QR-code generator

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The QR-code generator QR

  • QR code generator Android App

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#python #programming #qr-code #technology #data-science

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How to create your own QR code programmatically
Tyrique  Littel

Tyrique Littel

1604008800

Static Code Analysis: What It Is? How to Use It?

Static code analysis refers to the technique of approximating the runtime behavior of a program. In other words, it is the process of predicting the output of a program without actually executing it.

Lately, however, the term “Static Code Analysis” is more commonly used to refer to one of the applications of this technique rather than the technique itself — program comprehension — understanding the program and detecting issues in it (anything from syntax errors to type mismatches, performance hogs likely bugs, security loopholes, etc.). This is the usage we’d be referring to throughout this post.

“The refinement of techniques for the prompt discovery of error serves as well as any other as a hallmark of what we mean by science.”

  • J. Robert Oppenheimer

Outline

We cover a lot of ground in this post. The aim is to build an understanding of static code analysis and to equip you with the basic theory, and the right tools so that you can write analyzers on your own.

We start our journey with laying down the essential parts of the pipeline which a compiler follows to understand what a piece of code does. We learn where to tap points in this pipeline to plug in our analyzers and extract meaningful information. In the latter half, we get our feet wet, and write four such static analyzers, completely from scratch, in Python.

Note that although the ideas here are discussed in light of Python, static code analyzers across all programming languages are carved out along similar lines. We chose Python because of the availability of an easy to use ast module, and wide adoption of the language itself.

How does it all work?

Before a computer can finally “understand” and execute a piece of code, it goes through a series of complicated transformations:

static analysis workflow

As you can see in the diagram (go ahead, zoom it!), the static analyzers feed on the output of these stages. To be able to better understand the static analysis techniques, let’s look at each of these steps in some more detail:

Scanning

The first thing that a compiler does when trying to understand a piece of code is to break it down into smaller chunks, also known as tokens. Tokens are akin to what words are in a language.

A token might consist of either a single character, like (, or literals (like integers, strings, e.g., 7Bob, etc.), or reserved keywords of that language (e.g, def in Python). Characters which do not contribute towards the semantics of a program, like trailing whitespace, comments, etc. are often discarded by the scanner.

Python provides the tokenize module in its standard library to let you play around with tokens:

Python

1

import io

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import tokenize

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4

code = b"color = input('Enter your favourite color: ')"

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for token in tokenize.tokenize(io.BytesIO(code).readline):

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    print(token)

Python

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TokenInfo(type=62 (ENCODING),  string='utf-8')

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TokenInfo(type=1  (NAME),      string='color')

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TokenInfo(type=54 (OP),        string='=')

4

TokenInfo(type=1  (NAME),      string='input')

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TokenInfo(type=54 (OP),        string='(')

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TokenInfo(type=3  (STRING),    string="'Enter your favourite color: '")

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TokenInfo(type=54 (OP),        string=')')

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TokenInfo(type=4  (NEWLINE),   string='')

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TokenInfo(type=0  (ENDMARKER), string='')

(Note that for the sake of readability, I’ve omitted a few columns from the result above — metadata like starting index, ending index, a copy of the line on which a token occurs, etc.)

#code quality #code review #static analysis #static code analysis #code analysis #static analysis tools #code review tips #static code analyzer #static code analysis tool #static analyzer

Ortez Infotech

Ortez Infotech

1619071142

Contactless QR Code Restaurant Menu | E-Menu System Dubai

Ortez E-Menu offers far more than a standard menu of your restaurant. We help you to get more orders with less mistakes within a short span of time!

Keep in touch with us👇🏻
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Use of QR Code in Hotels, Restaurants and Resorts

The primary benefit of a QR code menu for hotels is that they’re convenient for you and your customers. It eliminates the need for physical menus at tables, creating a COVID friendly customer experience for your customers. Plus, You can personalize your code to display your brand logo and increase awareness for your business.

Visit : https://www.edocr.com/v/bgy0yqqr/brandconn/Use-of-QR-Code-in-Hotels-Restaurants-and-Resorts

#qr code for restaurants #qr code menu for restaurants #qr code menu for hotels

Key Features of QR Code Menu for Hotels & Restaurants

In order to beat the effects of COVID, restaurants and hotels have gone big with QR codes. QR code menu for restaurants are popular for providing a touch-free experience, being easy to use and opening up a new world of benefits. Read the Post Below Key Features of QR Code Menu for Hotels & Restaurants.

Visit : https://uberant.com/article/1761437-key-features-of-qr-code-menu-for-hotels-&-restaurants/

#qr code for restaurants #qr code menu for restaurants #qr code menu for hotels

Top Reasons Why QR Code Menu Is Good for Your Hotel

As the world prepares for a post-pandemic future, hotels and restaurants are offering a QR code menu for hotels and restaurants to maintain social distancing, hygiene creating a more COVID friendly customer experience. QR Codes are a great solution for a variety of hospitality businesses as they are easy to troubleshoot and eliminate the need for physical menus at tables. Click the link below to have an idea about the top Reasons Why QR Code Menu Is Good for Your Hotel.

Visit : https://www.edocr.com/v/zbjaj1dz/brandconn/top-reasons-why-qr-code-menu-is-good-for-your-hote

#qr code for restaurants #qr code menu for restaurants #qr code menu for hotels