Programming Leftovers

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• Heap Data Structure Tutorial

Data is a set of values. Data can be collected and put in a row, or in a column, or in a table or in the form of a tree. The structure of data is not only the placement of data in any of these forms. In computing, the data structure is any of these formats, plus the relationship among the values, plus the operations (functions) perform on the values. You should already have basic knowledge on tree data structure before coming here, as the concepts there, will be used here with little or no explanation.

• Perl Weekly Challenge 67: Number Combinations and Letter Phone

Perl does not have a built-in combinations function, but there are several modules (for example Math::Combinatorics) providing the functionality. However, this being a coding challenge, I don’t want to use a third-party ready-made solution and prefer to show a way to do it yourself.

If we knew in advance how many items we want in each combination, nested loops might be the best solution. But if we want to be flexible about the number of items in each combination, then it is often simpler to use a recursive approach. Here, the combinations subroutine is recursive and is called once for every item wanted in the combination.

• Lucky Number Per7

I swear it was Perl 5 just a moment ago. I turned my back for all of 5 minutes ...

I don't need the new features, but I don't like boilerplate and I'm happy to accommodate those who seek progress. Harking back to lessons from the past, SysAdmins of a certain age may remember the venerable a2p program for converting awk scripts to perl and the horrendous (but working) code that it produced. We had one of those running in production less than 2 years ago until I finally decided to re-write it in Modern Perl. A bit like moving house, as a community we need to face the pain every so often and address the risks and ptifalls, not as reasons to keep to the status quo, but as a checklist of problems to be solved.

• Episode #271: Unlock the mysteries of time, Python's datetime that is!

Time is a simple thing, right? And working with it in Python is great. You just import datetime and then (somewhat oddly) use the datetime class from that module.

Oh except, there are times with timezones, and times without. And why is there a total_seconds() but not total_minutes(), hours() or days() on timedelta? How about computing the number of weeks?

What if you wanted to iterate over the next 22 workdays, skipping weekends?

Ok, we'd better talk about time in Python! Good thing Paul Ganssle is here. He's a core developer who controls time in CPython.

• GSoC’20 First Evaluation

In the last blog, I wrote about my first two weeks on the GSoC period. In this blog, I would write about the activities to which I have worked further and implemented multiple datasets.

[...]

Why multiple datasets to GCompris activities?

As previously all of the activities were having a generalized dataset so for some of the age groups as for 3-5 yrs the activity seems quite difficult to play, and also for some of the age groups the activity seems to be quite easy. So, multiple datasets help in resolving this issue and we have multiple data for various age groups and all the activities can be more adaptive for the children.

More in Tux Machines

Open Hardware: Arduino, RISC-V and 96Boards

• Arduino-controlled robot arm is ready to play you in a game of chess

If you’re tired of playing chess on a screen, then perhaps you could create a robotic opponent like Instructables user Michalsky. The augmented board runs micro-Max source code, enabling chess logic to be executed on an Arduino Mega with room for control functions for a 6DOF robotic arm. The setup uses magnetic pieces, allowing it to pick up human moves via an array of 64 reed switches underneath, along with a couple shift registers. The Mega powers the robot arm accordingly, lifting the appropriate piece and placing it on the correct square.

• New RISC-V CTO On Open Source Chip Architecture’s Global Data Center Momentum

With more big international players on board, the foundation's new head of technology sees signs of "state of the art moving forward."

• Snapdragon 410 based 96Boards CE SBC gets an upgrade

Geniatech has launched a Linux-ready, \$109 “Developer Board 4 V3” compliant with 96Boards CE that offers a Snapdragon 410E, GbE, 3x USB, 802.11ac, GPS, and-25 to 70°C support. Geniatech has released a V3 edition of its 96Boards CE form-factor Developer Board 4 SBC, the third update of the Development Board IV we covered back in 2016. Starting at \$109, the Developer Board 4 V3 still runs Linux, Android, and Windows 10 IoT Core on Qualcomm’s 1.2GHz, quad -A53 Snapdragon 410m, although it has been upgraded to the 10-year availability Snapdragon 410E. Geniatech also sells a line of Rockchip based SBCs, among other embedded products.

Audiocasts/Shows: Linux in the Ham Shack and Linux Headlines

• LHS Episode #360: Zapped

Welcome to the 360th episode of Linux in the Ham Shack. In this short-topic show, the hosts discuss 1.2GHz distance records, a hybrid antenna for geosynchronous satellite operation, data mode identification for your smart phone, being pwned, Ubuntu 20.04.1, LibreOffice, HamClock and much more. Thanks for listening and hope you have a great week.

• LHS Episode #361: The Weekender LIV

It's time once again for The Weekender. This is our bi-weekly departure into the world of amateur radio contests, open source conventions, special events, listener challenges, hedonism and just plain fun. Thanks for listening and, if you happen to get a chance, feel free to call us or e-mail and send us some feedback. Tell us how we're doing. We'd love to hear from you.

• 2020-08-14 | Linux Headlines

Google could be extending its Firefox search royalty deal, PyPy leaves the Software Freedom Conservancy, Ubuntu puts out a call for testing, Linspire removes snapd support, Microsoft showcases its open source contributions, and Facebook joins The Linux Foundation.

Python Programming

• Django Weblog: DjangoCon Australia 2020: Schedule live and tickets on sale

The 8th DjangoCon AU was scheduled to be run in Adelaide, South Australia this year. It's been moved to an online event and will take place on September 4th. DjangoCon AU is organized as a specialist track as part of PyConline AU. The schedule — though shorter than in previous years — is packed with talks about best practices, communities, contributions, and the present and future of Django. Since the event was due to run in Adelaide, the event is running in Australian Central Standard Time, UTC+9:30, and DjangoCon AU will start at 3:45pm ACST. This link shows when the DjangoCon AU Opening address starts for all the DjangoCon timezones..

• Return how many times each letter shows up in the string by using an asterisk (*)

Hello people, in this article we will solve the below python problem. You receive the name of a city as a string, and you need to return a string that shows how many times each letter shows up in the string by using an asterisk (*).

• The Real Python Podcast – Episode #22: Create Cross-Platform Python GUI Apps With BeeWare

Do you want to distribute your Python applications to other users who don't have or even use Python? Maybe you're interested in seeing your Python application run on iOS or Android mobile devices. This week on the show we have Russell Keith-Magee, the founder and maintainer of the BeeWare project. Russell talks about Briefcase, a tool that converts a Python application into native installers on macOS, Windows, Linux, and mobile devices.

• Python vs R: Which is Good for Machine Learning?

If you want to build a machine learning project and are stuck between choosing the right programming language to build it, you know you have come to the right place. This blog will not only help you understand the difference between the two languages namely: Python and R; but also help you know which language has an edge over one another in multiple aspects. So without wasting a single moment, let’s dive into it!

• Freezegun - Real Joy for Fake Dates in Python

If you've ever tested code involving dates and times in Python you've probably had to mock the datetime module. And if you've mocked the datetime module, at some point it probably mocked you back when your tests failed.

• Mastering the SQLite Database in Python

In this tutorial, we shall see some advanced tasks associated with the SQLite database from Python. We shall see topics such as inserting images, Listing the tables, Backup a database, Dumping Rollback in SQLite, Deleting records from a table, Dropping a table, SQLite database exceptions, and more.

• Top 10 Important Uses cases of Python in the Real World

These top 10 Python uses cases in the real world prove how effective the programming language is. Read the real life uses of Python and implement it in your organization.

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