Do you want to one-linerize the append() method in Python? I feel you—writing short and concise one-liners can be an addiction!

This article will teach you all the ways to append one or more elements to a list in a single line of Python code!

Python List Append

Let’s quickly recap the append method that allows you add an arbitrary element to a given list.

How can you add an elements to a given list? Use the append() method in Python.

Definition and Usage

The list.append(x) method—as the name suggests—appends element x to the end of the list.

Here’s a short example:

>>> l = []

>>> l.append(42)

>>> l

[42]

>>> l.append(21)

>>> l

[42, 21]

In the first line of the example, you create the list l. You then append the integer element 42 to the end of the list. The result is the list with one element [42]. Finally, you append the integer element 21 to the end of that list which results in the list with two elements [42, 21].

Syntax

You can call this method on each list object in Python. Here’s the syntax:

list.append(element)

Arguments

Related articles:

• The Ultimate Guide to Python Lists
• List.append() method — A Simple Illustrated Guide

Python One Line List Append

Problem: How can you create a list and append an element to a list using only one line of Python code?

You may find this challenging because you must accomplish two things in one line: (1) creating the list and (2) appending an element to it.

Solution: We use the standard technique to one-linerize each “flat” multi-line code snippet: with the semicolon as a separator between the expressions.

a = [1, 2, 3]; a.append(42); print(a)

This way, we accomplish three things in a single line of Python code:

• Creating the list [1, 2, 3] and assigning it to the variable a.
• Appending the element 42 to the list referred to by a.
• Printing the list to the shell.

Related Article: Python One Line to Multiple Lines

Python One Line For Append

Problem: How can we append multiple elements to a list in a for loop but using only a single line of Python code?

Example: Say, you want to filter a list of words against another list and store the resulting words in a new list using the append() method in a for loop.

# FINXTER TUTORIAL:

# How to filter a list of words? words = ['hi', 'hello', 'Python', 'a', 'the']

stop_words = {'a', 'the'}

filtered_words = [] for word in words: if word not in stop_words: filtered_words.append(word) print(filtered_words)

# ['hi', 'hello', 'Python']

You first create a list of words to be filtered and stored in an initially empty list filtered_words. Second, you create a set of stop words against you want to check the words in the list. Note that it’s far more efficient to use the set data structure for this because checking membership in sets is much faster than checking membership in lists. See this tutorial for a full guide on Python sets.

You now iterate over all elements in the list words and add them to the filtered_words list if they are not in the set stop_words.

Solution: You can one-linerize this filtering process using the following code:

filtered_words = [word for word in words if word not in stop_words]

The solution uses list comprehension to, essentially, create a single-line for loop.

Here’s the complete code that solves the problem using the one-liner filtering method:

# FINXTER TUTORIAL:

# How to filter a list of words? words = ['hi', 'hello', 'Python', 'a', 'the']

stop_words = {'a', 'the'}

filtered_words = [word for word in words if word not in stop_words] print(filtered_words)

# ['hi', 'hello', 'Python']

Here’s a short tutorial on filtering in case you need more explanations:

Related Article: How to Filter a List in Python?

Python One Line If Append

In the previous example, you’ve already seen how to use the if statement in the list comprehension statement to append more elements to a list if they full-fill a given condition.

How can you filter a list in Python using an arbitrary condition? The most Pythonic and most performant way is to use list comprehension [x for x in list if condition] to filter all elements from a list.

Try It Yourself:

The most Pythonic way of filtering a list—in my opinion—is the list comprehension statement [x for x in list if condition]. You can replace condition with any function of x you would like to use as a filtering condition.

For example, if you want to filter all elements that are smaller than, say, 10, you’d use the list comprehension statement [x for x in list if x<10] to create a new list with all list elements that are smaller than 10.

Here are three examples of filtering a list:

• Get elements smaller than eight: [x for x in lst if x<8].
• Get even elements: [x for x in lst if x%2==0].
• Get odd elements: [x for x in lst if x%2].

lst = [8, 2, 6, 4, 3, 1] # Filter all elements <8

small = [x for x in lst if x<8]

print(small) # Filter all even elements

even = [x for x in lst if x%2==0]

print(even) # Filter all odd elements

odd = [x for x in lst if x%2]

print(odd)

The output is:

# Elements <8

[2, 6, 4, 3, 1] # Even Elements

[8, 2, 6, 4] # Odd Elements

[3, 1]

This is the most efficient way of filtering a list and it’s also the most Pythonic one. If you look for alternatives though, keep reading because I’ll explain to you each and every nuance of filtering lists in Python in this comprehensive guide.

Python Append One Line to File

Problem: Given a string and a filename. How to write the string into the file with filename using only a single line of Python code?

Example: You have filename 'hello.txt' and you want to write string 'hello world!' into the file.

hi = 'hello world!'

file = 'hello.txt' # Write hi in file '''

# File: 'hello.txt':

hello world! '''

How to achieve this? In this tutorial, you’ll learn four ways of doing it in a single line of code!

Here’s a quick overview in our interactive Python shell:

Exercise: Run the code and check the file 'hello.txt'. How many 'hello worlds!' are there in the file? Change the code so that only one 'hello world!' is in the file!

The most straightforward way is to use the with statement in a single line (without line break).

hi = 'hello world!'

file = 'hello.txt' # Method 1: 'with' statement

with open(file, 'a') as f: f.write(hi) '''

# File: 'hello.txt':

hello world! '''

You use the following steps:

• The with environment makes sure that there are no side-effects such as open files.
• The open(file, 'a') statement opens the file with filename file and appends the text you write to the contents of the file. You can also use open(file, 'w') to overwrite the existing file content.
• The new file returned by the open() statement is named f.
• In the with body, you use the statement f.write(string) to write string into the file f. In our example, the string is 'hello world!'.

Of course, a prettier way to write this in two lines would be to use proper indentation:

with open(file, 'a') as f: f.write(hi)

This is the most well-known way to write a string into a file. The big advantage is that you don’t have to close the file—the with environment does it for you! That’s why many coders consider this to be the most Pythonic way.

You can find more ways on my detailed blog article.

Related Article: Python One-Liner: Write String to File

Python One-Liners Book

Python programmers will improve their computer science skills with these useful one-liners.

Python One-Liners will teach you how to read and write “one-liners”: concise statements of useful functionality packed into a single line of code. You’ll learn how to systematically unpack and understand any line of Python code, and write eloquent, powerfully compressed Python like an expert.

The book’s five chapters cover tips and tricks, regular expressions, machine learning, core data science topics, and useful algorithms. Detailed explanations of one-liners introduce key computer science concepts and boost your coding and analytical skills. You’ll learn about advanced Python features such as list comprehension, slicing, lambda functions, regular expressions, map and reduce functions, and slice assignments. You’ll also learn how to:

•  Leverage data structures to solve real-world problems, like using Boolean indexing to find cities with above-average pollution
•  Use NumPy basics such as array, shape, axis, type, broadcasting, advanced indexing, slicing, sorting, searching, aggregating, and statistics
•  Calculate basic statistics of multidimensional data arrays and the K-Means algorithms for unsupervised learning
•  Create more advanced regular expressions using grouping and named groups, negative lookaheads, escaped characters, whitespaces, character sets (and negative characters sets), and greedy/nongreedy operators
•  Understand a wide range of computer science topics, including anagrams, palindromes, supersets, permutations, factorials, prime numbers, Fibonacci numbers, obfuscation, searching, and algorithmic sorting

By the end of the book, you’ll know how to write Python at its most refined, and create concise, beautiful pieces of “Python art” in merely a single line.

Get your Python One-Liners Now!!

Netmarble has released the official website for Ni no Kuni: Cross Worlds ahead of the Japanese launch later this year. The MMORPG is confirmed for both iOS and Android devices but is yet to be confirmed for an international release.

Ni no Kuni: Cross Worlds will include five starting classes for you to choose from, including the witch, swordsman, rogue, engineer, and destroyer. The MMORPG also includes PvP and PvE game modes, both of which involve real-time hack and slash combat. The story of Ni no Kuni: Cross Worlds involves meeting a mysterious girl called Rania and learning about her secret mission. To complete her mission, you must battle lots of powerful enemies and rebuild a kingdom.

The new Ni no Kuni: Cross Worlds website provides us with a detailed glimpse into the mobile MMORPG releasing later this year. The beautiful cel-shaded graphics, detailed information about the starting characters, and the bios of the adorable familiars you meet along the way are more than enough to get your fingers shaking with excitement.

Fancy taking a look at the beautiful cel-shaded world of Ni no Kuni: Cross Worlds? Then click on the trailer embedded below.

If you would like to visit the newly released website and read up about the characters and lore, you can do so from the official Ni no Kuni: Cross Worlds website.

Need an MMORPG to play right now? Then check out our guide of the best mobile MMORPGs.

One of the highlights of the recent Nintendo Direct Mini: Partner Showcase was the announcement of the Collection of SaGa Final Fantasy Legend – celebrating the SaGa series’ 30th anniversary.

The collection – featuring the first three Game Boy games – will arrive on 15th December. In Japan, there’ll also be a limited edition – although, it doesn’t come with a physical copy of the game. This will set fans back 14,500 yen and is exclusive to Square Enix’s store.

Here’s what it does include: a special sleeve case, a SaGa series medal set, a download code to redeem a digital copy of the game, an album soundtrack with music from all three games, and a 600-page SaGa series novel compilation.

There’s been no mention of a local release. Would you like to see Square Enix made something similar available here in the west? What are your thoughts about limited-edition releases that don’t include a physical copy of the game? Share your thoughts down below.

The last major update about Little Nightmares II was at last year’s Gamescom, when developer Tarsier Studios said the puzzle-platform horror adventure would be launching this year.

It seems that’s now changed, as this year’s Gamescom trailer has now revealed it’ll be arriving next year on 11th February. Here’s why it’s been delayed, according to producer Lucas Roussel:

We wanted to spend more time on the game and give it even more love, so we could create the best possible experience to delight our passionate fans.

And here’s what you can expect when it does arrive:

The game will let players take control of Mono, a young boy trapped in a distorted world, who will be accompanied by Six, the protagonist from the first game, who will be computer-controlled. Players will have to bond and work with Six to solve puzzles, discover the world’s grimmest secrets and escape its monstrous inhabitants, such as the horrifying Hunter and the grotesque Teacher.

Take a look at the trailer above and tell us how you feel about this delay? Let us know in the comments.

Since its launch in November 2019, Microsoft HoloLens 2 has helped enterprises in manufacturing, construction, healthcare, and retail onboard employees more quickly, complete tasks faster, and greatly reduce errors and waste. It sets the high-water mark for intelligent edge devices by leveraging a multitude of sensors and a dedicated ASIC (Application-Specific Integrated Circuit) to allow multiple real-time computer vision workloads to run continuously. In Research Mode, HoloLens 2 is also a potent computer vision research device. (Note: Research Mode is available today to Windows Insiders and soon in an upcoming release of Windows 10 for HoloLens .)

Compared to the previous edition, Research Mode for HoloLens 2 has the following main advantages:

• In addition to sensors exposed in HoloLens 1 Research Mode, we now also provide IMU sensor access (these include an accelerometer, gyroscope, and magnetometer).
• HoloLens 2 provides new capabilities that can be used in conjunction with Research Mode. Specifically, articulated hand-tracking and eye-tracking which can be accessed through APIs while using research mode, allowing for a richer set of experiments.

With Research Mode, application code can not only access video and audio streams, but can also simultaneously leverage the results of built-in computer vision algorithms such as SLAM (simultaneous localization and mapping) to obtain the motion of the device as well as the spatial-mapping algorithms to obtain 3D meshes of the environment. These capabilities are made possible by several built-in image sensors that complement the color video camera normally accessible to applications.

HoloLens 2 has four grayscale head-tracking cameras and a depth camera to sense its environment and perform articulated hand tracking. It also has two additional infrared cameras and accompanying LEDs that are used for eye tracking and iris recognition. As shown in Figure 1, two of the grayscale cameras are configured as a stereo rig, capturing the area in front of the device so that the absolute depth of tracked visual features can be determined through triangulation. Meanwhile, the two additional grayscale cameras help provide a wider field of view to keep track of features. These synchronized global-shutter cameras are significantly more sensitive to light than the color camera and can be used to capture images at a rate of up to 30 frames per second (FPS).

The depth camera uses active infrared (IR) illumination to determine depth through phase-based time-of-flight. The camera can operate in two modes. The first mode enables high-framerate (45 FPS) near-depth sensing, commonly used for hand tracking, while the other mode is used for lower-framerate (1-5 FPS) far-depth sensing, currently used by spatial mapping. As hands only need to be supported up to 1 meter from the device, HoloLens 2 saves power by reducing the number of illuminations, which results in the depth wrapping around beyond one meter . For example, something at 1.3 meters will appear at 0.3 meters in HoloLens 2 in this case. In addition to depth, this camera also delivers actively illuminated IR images (in both modes) that can be valuable in their own right because they are illuminated from the HoloLens and reasonably unaffected by ambient light. Azure Kinect uses the same sensor package, but with slightly different depth modes.

With the newest Windows Insider release of Windows 10 for HoloLens, researchers now have the option to enable Research Mode on their HoloLens devices to gain access to all of these external facing raw image sensors streams. Research Mode for HoloLens 2 also provides researchers with access to the accelerometer, gyroscope, and magnetometer readings. To protect users’ privacy, raw eye-tracking camera images are not available through Research Mode. Researchers can access eye-gaze direction through existing APIs.

For other sensor streams, researchers can also still use the results of the built-in computer vision algorithms and can now also choose to use the raw sensor data for their own algorithms.

The sensors’ streams can either be processed or stored on device or transferred wirelessly to another PC or to the cloud for more computationally demanding tasks. This opens a wide range of new computer vision applications for HoloLens 2. HoloLens 2 is particularly well suited as a platform for egocentric vision research as it can be used to analyze the world from the perspective of a user wearing the device. For these applications, HoloLens devices’ abilities to visualize results of the algorithms in the 3D world in front of the user can be a key advantage. HoloLens sensing capabilities can also be very valuable for robotics where these can, for example, enable a robot to navigate its environment.

These new HoloLens capabilities will be demonstrated at a tutorial on August 28th, 2020, at the European Conference on Computer Vision (ECCV). An initial set of sample apps is being made available showcasing computer vision use cases on GitHub, and you can check out the Research Mode documentation for further technical details.

This week at Bungie, we gave a chilling new look at Stasis.

It feels like just yesterday you were getting your first look at Stasis. Today during a virtual gamescom, we took a deeper look, introducing you to the Hunter Revenant, Titan Behemoth, and Warlock Shadebinder subclasses. There’s quite a bit to chew on. How do the new grenades work? What about melee attacks? What are those things that the Hunter just threw? This is just the start.

An Early Patch Note Preview

Solstice of Heroes: Ornament Glows

Shortly after Solstice went live, we became aware of a difference between how the universal armor glow bundle icon was depicted and how it visually performed in the game. After investigating the issue, we felt the difference between them was too vast. We have revisited the glow intensity of these ornaments and enhanced the in-game appearance to match the icon as closely as possible.

Sleeper Nodes

Due to the way that the Sleeper Nodes were created, we are unable to completely remove the possibility of receiving duplicate Override Frequencies, but we are making some improvements to greatly reduce the odds of receiving a duplicate. The following tips will help you avoid duplicates and acquire those final elusive nodes.

In different terms, the team has created a form of “bad luck protection” for Sleeper Nodes, but the tracking is starting fresh. Get hunting, and you’ll be unlocking a unique emblem before you know it.

Assorted Fixes and Changes

We have a few more general bug fixes slated for this update as well. Player Support will have a final preview of bugs to be resolved next week, followed by the full list of patch notes when the update goes live.

See you in two weeks!

Resolution

Over the last week, Destiny Player Support has been working with various teams at Bungie to resolve a few high priority issues. First up, dishing out some rightly earned Bright Dust to players who completed Solstice bounties. Second, a fix for one of our more notorious error codes. Read on for details!

Solstice Bounties

In Hotfix 2.9.1.3, we resolved an issue where weekly and repeatable Solstice of Heroes bounties did not grant Bright Dust rewards upon completion. We have since granted Bright Dust to the first wave of affected players, and will be sending out a second grant in the near future.

Error Code TAPIR

We have resolved an issue causing players to encounter error code TAPIR when they try to launch Destiny 1 while they have a Twitch account linked to their Bungie.net account.

Current Known Issues

While we continue investigating various known issues, here is a list of the latest issues that were reported to us in our #Help Forum:

Sound and String

It’s come to our attention that we issued a duplicate Honorable Mention last week for a showcase of Tex Mechanica weaponry. While you can hardly blame us for celebrating awesome content like that, we need to make up for it this week. We have a few extra winners to show. Top of the list, we’ve got some great musical talents on display. Hope you enjoy!

Movie of the Week: Journey – Violin Cover

Honorable Mention: Curse of Osiris Meets Metal

Honorable Mention: Fall Guardians

Honorable Mention: The complete opposite of the previous Honorable Mention

Honorable Mention: POP THE BUBBLES

If one of these videos belongs to you, congrats! Now make sure you have your Bungie.net profile in the description of said video so we can send out your prize emblem.

Summer is fading. The days are getting shorter and even a bit darker in our neck of the woods. An evening chill is beginning to creep into the air. It’s the perfect mood for Stasis subclasses to enter the realm of Destiny 2, and for our first steps on Europa in November. Just a few short months stand between you and Beyond Light.

Cheers,

-dmg04

This October sees the return of the Wii U title, Pikmin 3, in ‘Deluxe‘ form on the Nintendo Switch. To help build up the excitement for this release and teach players a bit more about this particular entry, Nintendo has uploaded a new video on its Japanese YouTube account featuring more than three minutes of gameplay footage and some lovely animations.

As previously revealed, this newer version of Pikmin 3 comes packed with all of the DLC from the original game and even includes some brand new side-story missions featuring Olimar and Louie. There are also plenty of pre-order deals on offer. Fancy a Pikmin 3 coffee cup or microfibre cloth with your copy of the game? Then check out our guide.

Will you be adding Pikmin 3 Deluxe to your Switch collection when it arrives this October? Tell us down below.