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Introduction to Redis INCR

Redis INCR is used to increment the number that was previously stored in the key. If the key does not exist, it will be set to zero before any operation is performed. If the query contains an incorrect value, an error such as the wrong data type or a string representing the integer value is returned. The redis incr operations are limited to signed integers of 64 bits and will include string operations.

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Key Takeaways

Incr command is useful when we need to increment the value of the key with 1 in a specified interval of time.

By using incr command we are incrementing the key value with one. If suppose key does not exist then it will create new key.

What is Redis INCR?

The redis incr command is used to increment the value specified in the key. If the key does not exist when the value is incremented, it will be created. The Redis incr command returns an error in output if we provide incorrect input, such as a string value instead of an integer value.

The Redis incr command only accepts integer values; if we provide a string value, we will receive an error stating that string values are not permitted when using the incr command. We can use multiple values to increment our key in Redis. If we have set our key value to 1 and need to increment it by 1 to make it 2, we can use redis incr at the same time. We can also increment the value of key as per value.

How to Use Redis INCR?

To use the redis incr command we need to install the same in our system.

1. In this step we are installing the redis server in our system. The below example shows to install the redis as follows.

Command:

# apt install redis-server

Output:

2. In Ubuntu server, while installing, the redis server does not start automatically. To start the same we need to execute the below command. While starting the redis server it will accept the redis connections.

# redis-server

Output:

3. Now in this step we are login in the redis server by using the below command. We are connecting to the local host server.

Code:

# redis-cli

Output:

4. While connecting to the redis server, now we are creating the key by using the set command as follows.

Command:

SET incr_key 101

Output:

5. After setting the value of the key now in this step we are incrementing the key value by 1 as follows.

Command:

INCR incr_key

Output:

6. After executing the incr command, now in this step we are checking the current value of the key.

Command:

GET incr_key

Output:

Redis String INCR Command

Basically, redis string incr command is used to increment the value of the key by 1. The below syntax shows the redis string incr command as follows:

Syntax:

INCR key_name

In the above syntax incr command is used in redis to increment the value of the key which we have defined. The key name parameter is defined as the name of the key that we used with the incr command.

The below example shows the redis incr command. We are creating the key name as incr_key1 and assigning the value to the key as 10. Then we are incrementing the value with 1 using incr command then we are using get method to check the current value of the key.

Command:

SET incr_key1 10 INCR incr_key1 GET incr_key1

Output:

In the below example, if we are not creating any key at the time of using the incr command then we can see that it will create the new key.

Command:

INCR incr_key2 GET incr_key2

Output:

If we have defined the string value at the time of creating key, then the incr command is returning an error as follows.

SET incr_key4 val1 INCR incr_key4

Output:

Basic Points of Redis INCR

Given below are the basic points of redis INCR:

1. Redis DECOR Command

This command is used to decrement the number which was stored in the key. If the key does not exist in DB then it will set the value of the key as zero. If the key contains the wrong type value then the decr command returns an error.

Below syntax shows the decr command as follows:

Syntax:

DECR key_name

The below example shows the redis decor as follows. We are creating a key by using the set command then we are using the decr command to decrement the key value by 1 as follows.

Command:

SET key1 10 DECR key1 GET key1

Output:

In the below example, we are creating the key by using the decr command because it is not present.

Command:

DECR key_decor GET key_decor

Output:

2. Redis INCRBY Command

Redis incrby command is used to increment the key value by increment. Suppose the key does not exist then it will be set as zero before performing any operation on the key. The below syntax shows the incrby command as follows.

Syntax:

INCRBY key_name integer_val

The below example shows redis incrby command. We are using the key name as incby_key and incrementing the value of a key by 10 as follows.

Command:

SET incrby_key 10 INCRBY incrby_key 10 GET incrby_key

Output:

3. Redis DECRBY Command

Redis decrby command is used to decrement the key value by decrement. Suppose the key does not exist, then it will be set as zero before performing any operation on the key. The below syntax shows decrby command as follows.

DECRBY key_name integer_val

The below example shows the redis decrby command. We are using the key name as decrby_key and decrementing the value of the key by 5 as follows.

Command:

SET decrby_key 10 DECRBY decrby_key 5 GET decrby_key

Output:

4. Redis INCRBYFLOAT Command

This command is used to represent the floating point number that was stored in the key and the same is specified by increment. The below syntax shows incrbyfloat command as follows.

Syntax:

INCRBYFLOAT key_name float_val

The below example shows the incrbyfloat command in redis. We are setting the value as a floating point number as follows.

Command:

SET key10 10.5 INCRBYFLOAT key10 20.5 GET key10

Output:

5. Redis Closing Command

The redis closing command is used to close the connection of redis. To close the redis connection we are using the quit command. At the time of executing this command connection is closed as well as all the operation is closed. The below syntax shows the closing command as follows.

Syntax:

QUIT

The below example shows how we can close the connection in redis as follows. We are closing the connection using the quit command.

Command:

QUIT

Output:

FAQs

Given below are the FAQs mentioned:

Q1. What is the use of the incr command in redis?

Answer: The incr command in redis is used to increment the value of the key by one. We need to specify the integer value in the key at the time of creation.

Q2. Which argument is accepted in the redis incr command?

Answer: Redis incr command accepts the key_name at the time of executing the same. If the key is created, it will increment the value of one. If the key is not created, then it will create new key.

Q3. What is the difference between incr of incrby command in redis?

Answer: Incr command increments the key value by one. Incrby command is used to increment the value as per the value that we have defined in the key.

Conclusion

Redis incr command only accepts integer values; if we provide a string value, we will receive an error stating that string values are not permitted when using the incr command. Redis INCR is used to increment the number that was previously stored in the key. If the key does not exist, it will be set to zero before any operation is performed.

Driving Disruption In Your Industry: Key Technologies In The Next Mobile Economy

No industry is safe from disruption. It’s probably already begun in yours.

Just take a look at the apps on your phone, and the way you use them. Companies have already taken enormous market share away from incumbent corporations, at a rapid pace, by leveraging mobile technology to provide convenient alternatives to customers.

Mobility has changed the way we work, and the way that businesses offer services to people. Having stepped outside the rigid IT controls and legacy systems that once bound us, or maybe even inconvenienced us, there’s no going back: We all expect consumer-like mobile experiences. At home, at the workplace, and everywhere in between.

This is nothing particularly new, of course. Ever since the spinning jenny mechanized textile manufacturing in the 18th century, technology has been revolutionizing the way we work, create and deliver products. At the expense of many a traditional business model.

A New Era of Opportunity

Today, we find ourselves in the midst of Industrial Revolution 4.0; one that has both built on the progress of previous iterations, and differentiated itself altogether. While the first two industrial revolutions were machine-driven, enabling mass production and increasing efficiency, the third began turning away from that — with automation, digitization and enhancements in data — ultimately putting more power into consumers’ hands than before. The fourth has taken all these a step further; bringing us exponential increases in computing power, connectivity and artificial intelligence (AI) that are creating new possibilities across all fields.

At Samsung, we refer to this new era of opportunity as the Next Mobile Economy.

The Building Blocks of Disruption

Mobility allows us to bring people, assets, and data together like never before. Today, mobile technology is the leading business imperative for most of the organizations that we talk to, and a catalyst for progressive business growth.

To succeed in the Next Mobile Economy, it won’t be enough to be aware of emerging trends. You’ll need to understand what you can achieve with them, so you can bring them together with your existing infrastructure in ways that are sensible — and valuable — to your customers.

We’ve identified four key technologies which we’ve come to think of as building blocks for disruption and transformation, regardless of your industry: AI, mixed reality (AR/VR), the Internet of Things (IoT) and 5G connectivity.

A lot of the AI you find today is in the form of personal assistants: like Bixby, helping you keep track of your appointments or book a cab. We also see software bots that allow workflows to be completed automatically, or chatbots on 24/7 helpdesks.

At enterprise level, it’s going even beyond that. While most of the AI you’re familiar with are simply following defined decision trees, some are actually learning as they go along. And that’s where it gets interesting.

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We are now able to tap on the contextual awareness of our devices, so that they can use the inputs they receive to make cognitive, automated decisions on our behalf. Imagine, for some reason, your phone were to become the target of a corporate rival or even a foreign government. Or that you simply end up in an unsafe network. AI can automatically detect that something is happening, and start removing assets and data from your device, or block services on it, and redeploy them at a later date. It could realize that you’re interacting with things in a way you normally wouldn’t, and challenge you for re-authentication.

We’re taking AI in the direction of replacing some of the decision-making an IT department would normally need to make, in a manner that’s more proactive. What if we could use it to free them up to do the more interesting work that they’d likely rather be doing?

Mixed Reality

Mixed reality refers to both augmented reality (AR) and virtual reality (VR). These are still in their infancy, but are already making an impact in certain business sectors. Real estate or property management firms, for example, might use VR to propagate their portfolio far beyond the confines of their physical locations. You could be in New York City, taking an extensive tour of an office in Dubai without needing to be there.

VR is also being used in employee training programs to provide richer, more interactive experiences. We’re seeing that people retain far more information via these VR scenarios than they would via more passive mediums, like slideshows, because they find themselves immersed in real-world situations. Their decisions can affect the narrative arc of the session, and they actually experience its outcomes.

In a groundbreaking new development, clinical trials are proving that VR can be an effective, non-pharmacological alternative to opioid-based pain management. Used in conjunction with wearables, the technology functions as therapy for those suffering from acute orthopedic injuries, reducing medical costs and lowering patients’ chances of developing an opioid addiction.

AR, meanwhile, is making waves in environments like precision manufacturing plants, where people rely on hands-free computing to supply information to them via smart glasses or flat screens in front of them.

Internet of Things

Business consultants Frost & Sullivan anticipate that by 2023, the average digital citizen will have access to 10 connected devices across home and the workplace. By the same year, Gartner Research expects to see at least 20 billion interconnected devices, all doing different things. And we are well on our way already.

These exist in the form of smartphones, tablets, wearables and Connected Home appliances. And both the number and variety of connected devices are exponentially increasing, across many different industries. Take, for example, sensors in our vehicles linked to Smart City grids. If you have an accident, emergency services can be auto-dispatched. Your watch, scanning your vital signs, can relay information directly to the nearest hospital. Your vehicle can start sending information to your insurance company. We’re not talking about one-to-one connections — we’re talking about the ability to connect everything, and have them talk to each other simultaneously.

5G Connectivity

Enabling all of these is 5G, which is going to be deployed commercially later this year, and expand through 2023. 5G is going to bring you a speed on wireless networks that will surpass the wired speed we have on fiber today. More importantly, you’ll enjoy near-zero latency on a 5G network, compared to the slight delays you might be experiencing today.

This will be critical to ensure that devices on our IoT networks are speaking to each other as smoothly as they need to be. If we look back on our connected car example, the sensors on these cars will need to communicate with each other at a guaranteed immediate speed, and that’s what 5G will deliver. This level of service will empower the use of remote equipment, like drones or robots, in a manufacturing facility or hospital, because we’ll be able to rely on them in ways we haven’t before.

5G will also enable network slicing, which allows us to prioritize data traffic on a network. You’ll be able to create multiple virtual networks on top of your physical one, which you can then customize to meet the specific speed and latency needs of services, applications and data packets. And give you a far more credible amount of control over your solutions.

Mobility is Critical

Mobility is evolving rapidly. It has evolved from being a mere differentiator, to a critical component of business innovation and the catalyst for change. The four emerging technologies we’ve introduced can help you drive disruption, but only if you adopt them in ways that can add value to both your infrastructure and your customers. Your greatest challenge will lie in finding ways to deploy them holistically, like pieces of the same big puzzle, instead of treating them as separate tools.

We would not want to prescribe how you should run your business or how you should disrupt your industry, but we hope these building blocks provide a significant starting point to an exciting journey ahead. And we’re looking forward to being part of that journey with you.

Using The Append() Method In Python

One of the essential features of Python is the ability to manipulate lists, which are collections of items of the same or different data types such as strings, integers, or even other lists. In this article, we will explore the append() method, which is a built-in function in Python that allows you to add an item to the end of a list.

What is Python Append?

The append() method is a list method in Python that adds an item to the end of a list. The syntax of the append() method is as follows:

list.append(item)

Here, list is the name of the list to which you want to add an item, and item is the value that you want to append. The append() method modifies the original list and returns None. It does not create a new list.

How to Use Python Append?

Let’s look at some examples of how to use the append() method in Python.

Example 1: Adding an Integer to a List numbers = [1, 2, 3, 4] numbers.append(5) print(numbers)

Output:

[1, 2, 3, 4, 5]

In this example, we have a list of integers called numbers. We use the append() method to add the integer 5 to the end of the list. The print() function is used to display the modified list.

Example 2: Adding a String to a List fruits = ['apple', 'banana', 'cherry'] fruits.append('orange') print(fruits)

Output:

['apple', 'banana', 'cherry', 'orange']

In this example, we have a list of strings called fruits. We use the append() method to add the string ‘orange’ to the end of the list. The print() function is used to display the modified list.

Example 3: Adding a List to a List list1 = [1, 2, 3] list2 = [4, 5, 6] list1.append(list2) print(list1)

Output:

[1, 2, 3, [4, 5, 6]]

In this example, we have two lists called list1 and list2. We use the append() method to add list2 to the end of list1. As a result, list1 becomes a nested list that contains both the original elements and the new list.

Example 4: Adding Multiple Items to a List colors = ['red', 'green', 'blue'] colors.append('yellow', 'purple') print(colors)

Output:

TypeError: append() takes exactly one argument (2 given)

In this example, we have a list of strings called colors. We attempt to add two strings, ‘yellow’ and ‘purple’, to the end of the list using the append() method. However, this results in a TypeError because the append() method can only accept one argument at a time.

Example 5: Using Append in a Loop numbers = [] for i in range(1, 6): numbers.append(i) print(numbers)

Output:

[1, 2, 3, 4, 5]

In this example, we create an empty list called numbers. We use a for loop to iterate from 1 to 5 and append each integer to the end of the list. The print() function is used to display the modified list.

Related Concepts and Methods

There are several other list methods in Python that are related to the append() method and can be useful in various scenarios.

extend(iterable)

This method can be used to append all the elements of an iterable to a list. For example:

list1 = [1, 2, 3] list2 = [4, 5, 6] list1.extend(list2) print(list1)

Output:

[1, 2, 3, 4, 5, 6] insert(index, item)

This method can be used to insert an item at a specific position in a list. For example:

numbers = [1, 2, 3, 4] numbers.insert(2, 2.5) print(numbers)

Output:

[1, 2, 2.5, 3, 4] remove(item)

This method can be used to remove the first occurrence of an item from a list. For example:

colors = ['red', 'green', 'blue', 'green'] colors.remove('green') print(colors)

Output:

['red', 'blue', 'green'] pop(index)

This method can be used to remove and return the item at a specific position in a list. If no index is specified, it removes and returns the last item in the list. For example:

numbers = [1, 2, 3, 4] last_number = numbers.pop() print(last_number) print(numbers)

Output:

4 [1, 2, 3]

By understanding these related concepts and methods, you can expand your knowledge of list manipulation in Python and write more efficient and effective code.

Conclusion

The append() method in Python is a simple yet powerful way to add an item to the end of a list. By using this method, you can modify lists dynamically and create complex data structures that can be used in a variety of applications. Whether you are a beginner or an experienced Python programmer, understanding the append() method and its related concepts is an essential skill that can help you write better code and solve more complex problems.

Using The Format Method In Python

Python format is a method used to format strings in a more readable and user-friendly way. It allows you to insert values into a string in a specific format, making it easier to read and understand. The method uses placeholders, which are enclosed in curly braces {}, to indicate where values should be inserted into the string.

Basic Usage

To use Python format, you simply need to create a string with placeholders and then pass values to the placeholders using the format method. Here is an example:

name = "John" age = 25 print("My name is {} and I am {} years old.".format(name, age))