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Bitcoin Cryptocurrency Mastering Development

Why is my bitcoin core not downloading any blocks?

I am using Centos 7 and I installed the newest version of bitcoin core. I just want to run a full node to download all the blocks. According to their documentation, the first time we start bitcoin core, it will start automatically to download the blocks. This is my ./bitcoin/bitcoin.conf file: server=1 daemon=1 rpcuser=helloworld rpcpassword=whatever […]

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Bitcoin Cryptocurrency Mastering Development

About polluting the peer table

Is there a well-known method to pollute a specific user’s peer table? Eclipse attack is not available anymore due to the patch after a paper was introduced. Can you give some keywords? Thank you!

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Mastering Development

How to stack Text vertically with rotation using Jetpack Compose?

Trying to align text elements as shown in the image below: How to do it in Jetpack Compose? Normally I would use a Linear Layout with vertical orientation and TextViews with a rotation of 90. Wondering how to achieve this in compose.

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Mastering Development

How to stop the actual string keys being appended?

I am trying to extract data from https://betfair-data-supplier-prod.herokuapp.com/api/daily_racing_results?date=2020-01-02 . My code: marketids = [] request = requests.get(‘https://betfair-data-supplier-prod.herokuapp.com/api/daily_racing_results?date=2020-01-02’) json = request.json() for market in json: if market[‘raceType’] in [‘R’]: marketids.append([‘marketid’]) Output of my code: [[‘marketid’], [‘marketid’], [‘marketid’], [‘marketid’], [‘marketid’], [‘marketid’]] How do I get the actual marketid’s as output (e.g. 166897895, 166897897)?

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Mastering Development

easyprocess.EasyProcessError: start error (oserror=[Error 2] The system cannot find the file specified) Python 2.7

I tried to find relevant question, but it does not seem to fix my problem. I am currently running a program using easyprocess module on python2.7 on MS Windows10, using Anaconda. DIR = D:\WORKSPACE\Project\PROGRAMS if verbose: print "Calling sprep96" cmd = os.path.join(DIR, ‘sprep96’) p = EasyProcess(‘"{}" -M model -PARR periods -NMOD 1 -R’.format(cmd)).call() sprep96 is […]

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Mastering Development

pick only latest record by ID in python

I am looking for a way in python to only select latest date observations by ID. What would be the best most efficient way to do it? (I do not want to sort, I want to isolate only latest observations) I have tried the following: data1.loc[data1.groupby(‘id’)[‘date’].idxmax()] but it doesn’t work.

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Mastering Development

MERN router.get request returning undefined

So, I’m trying to use a get request to find the email of a user and display the information on screen. To do this, I set a local storage item with the user’s email and am trying to reference this in my api call. However, on the back-end side of things, when I try and […]

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Mastering Development

NavigationLink not pulling new view into correct location

I have a NavigationLink that is pulling a Form view on top of a list view. The thing I am experiencing is this "rubber band" effect that is happening when the view is pulled in. I can’t really explain it with works so here is a gif explaining it Here is a snippet of the […]

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Mastering Development

PostgreSQL columns in table being included in more than one index?

I am currently looking at adding indexes to my PostgreSQL database in development. The database is primarily a customer database, which will house around 5 million customer records in the Customer table, and all other tables are children of Customer, and may contain one or more records that associate back to a customer. Most operations […]

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Linux Mastering Development

Apps are unable to see files from another HDD after reboot

OS: latest Ubuntu 18 version I have another HDD and few apps that use files from that HDD. For example, I store audio files there and listen to them using Clementine. Usually I add my audio files to the playlist but after any reboot I’m unable to listen to those unless I add them to […]