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Mastering Development

Where to find documentation of `+` operator for `list`?

In python, one can use the following to concatenate two lists into a new one : l1 = list(range(0 ,3)) l2 =list(range(3, 10)) l3 = l1 + l2 I am looking for the official documentation describing the + operation on two lists but can’t find it. Is there any reference documentation for that, and if […]

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Ask Chemistry

Is it possible to make Aluminium Hydroxide from Aluminium Oxide?

I am doing a lab, and it requires aluminium hydroxide, but unfortunately I do not possess some, however, I do have aluminium oxide. I was wondering if it was possible to make aluminium hydroxide from aluminium oxide, and if yes, what are the steps and the material required please.

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Mastering Development

Stop ec2 instance after 5 minutes with sleep – time.sleep() not working as expected?

I have the following piece of code running in lambda. I want to stop my EC2 instance, after 5 minutes. For this i have used time.sleep to have a interval of 5 minutes before issuing stop_instance command. But the code does not pass after the time.sleep, and instead loops the lambda script from beginning? ec2 […]

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Game Creation Mastering Development

How do I spread a LookAt rotation over 3 bones with different percentages?

I’m trying to rebuild the RE4 controller. At first, I thought that only the chest bone is used to rotate the pistol towards a target. I have then however found a hack to put the camera in a fixed position so that I could actually see the bone rotations. Juding the logic that I have […]

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Mastering Development

if condition for java sikuli is not working

I am writing scripts using Java-sikuli, and trying to use if condition as follows: if(screen.exists(gameIsInProgress) != null || screen.exists(waitingFormorePlayer) !=null) { screen.click(settingsOnGameWindow); screen.click(exitRoom); screen.click(yes); } I am checking whether the image exists, and if – yes, then I click some buttons. The issue is, even if the image does not exist it is searching for […]

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Linux Mastering Development Ubuntu

Is there a libpng12 library for 18.04 LTS arm64?

I am trying to make an nVidia Jetson Nano developer board work with a USB camera that seems to operate over a proprietary protocol, since OpenCV 4 can’t interact with it like it can with a simple USB webcam. The docs to the camera I’m working with link to an SDK that is used to […]

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Cryptocurrency Ethereum Mastering Development

I would like to warp a token and inherit its methods in a wrapper without declaring them in a wrapper. Can I do this?

The reason why I am asking this is to create something that is closely related to mutability. So, instead of creating a different token every time there is a code-change, I would like to simply use a wrapper and then wrap another token/contract that has the updated code. Was anything like this done before, and […]

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Ask Biology

What is the mass of a separate erythrocyte?

I really have been searching through internet on different languages, but can’t find any article that answers on the question what is the single erythrocyte mass. I don’t know, I think it’s pretty easy to calculate experimentally, but I didn’t find anything. Has anyone measured single erythrocyte mass, and if yes, what is the value?

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CMS Magento Mastering Development

Are there (free) extended versions of Magento that make it easier than using Magento from scratch to jumpstart the front-end of a web store quickly?

Are there (free) extended versions of Magento that make it easier than using Magento from scratch to jumpstart the front-end of a web store quickly (other than Magento Commerce or Magento B2B)? For example, Woocommerce is based on WordPress, ERPAL is based on Drupal. Woocommerce and ERPAL are both their base/core CMSes PLUS extensions, themes […]

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Game Creation Mastering Development

Portal physics by bending space

I’ve been thinking about how to implement a portal, and after a quick search, everyone seems to do it by adding a camera per portal and then just update the other portal’s view with that camera’s view. But if portals were real (like our real, the real in front of the monitor), they’d bend space […]