Programming Leftovers
Submitted by Roy Schestowitz on Tuesday 16th of April 2019 03:05:59 PM
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Programming languages: Python developers now outnumber Java ones [Ed: Makes the typical grave error of using a Microsoft site as an indicator of programming and FOSS trends as if coders don't exist unless they give their code to Microsoft]
Python's rise among developers around the world has been documented by several well-known programming-language indexes. But UK developer-focused analyst SlashData has now put a figure on the actual number of developers that use the language.
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Removing Files from Git History
Today I did run again into an old problem: You need to archive a lot small and large files inside a single Git repository and you have no support for Git LFS available. You did this several year and now you ended up in a state where cloning and working with the repository is unbearable slow.
What now? Last time I did run into that, I archived the overfull repository to some “rest in peace” space and used git filter-branch to filter out no longer needed and too large objects from a repository copy that then will replace the old one for daily use.
There are a lot of guides available how to use git filter-branch for that. All variants I ever used were complex to do and did take very long. Especially if you need several tries to get a sane set of stuff you want to remove to gain enough space savings.
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An important message to people designing testing frameworks!
Do not, I repeat, NOT make your test framework fail a test run if it writes any text to stderr! No matter how good of on idea you think it is, it's terrible.
If you absolutely, positively have to do that, then print the reason for this failure in your output log. If you can't think of a proper warning message, feel free to copy paste this one...
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Detecting malaria with deep learning
There are several methods that can be used for malaria detection and diagnosis. The paper on which our project is based, "Pre-trained convolutional neural networks as feature extractors toward improved Malaria parasite detection in thin blood smear images," by Rajaraman, et al., introduces some of the methods, including polymerase chain reaction (PCR) and rapid diagnostic tests (RDT). These two tests are typically used where high-quality microscopy services are not readily available.
The standard malaria diagnosis is typically based on a blood-smear workflow, according to Carlos Ariza's article "Malaria Hero: A web app for faster malaria diagnosis," which I learned about in Adrian Rosebrock's "Deep learning and medical image analysis with Keras." I appreciate the authors of these excellent resources for giving me more perspective on malaria prevalence, diagnosis, and treatment.
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removing array duplicates
I had an array with some duplicates. I wanted to remove them. I know how to do this, but I searched for solutions anyway to make sure I wasn’t missing some trick. The results were disappointing, very language specific, and rarely discussed run time. And if we’re working with an unsorted array, the provided answers are even worse. Just sort the array first. Well, duh; any problem with unsorted data can be transformed into a problem with sorted data by sorting first. That’s not very interesting, though, and maybe there’s a reason the data is unsorted. Here’s a few solutions I worked through, but no stunning algorithmic breakthroughs.
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A Rule of Divisibility by 7
A number m of the form 10x + y is divisible by 7 if and only if x − 2y is divisible by 7. In other words, subtract twice the last digit from the number formed by the remaining digits. Continue to do this until a number known to be divisible or not by 7 is obtained; you can stop when this number has at most 2 digits because you are supposed to know if a number of at most 2 digits is divisible by 7 or not.
The original number is divisible by 7 if and only if the last number obtained using this procedure is divisible by 7.
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Debugging Clang AST Matchers
Last week I flew to Brussels for EuroLLVM followed by Bristol for ACCU.
At both conferences I presented the work I’ve been doing to make it easier for regular C++ programmers to perform ‘mechanical’ bespoke refactoring using the clang ASTMatchers tooling. Each talk was prepared specifically for the particular audience at that conference, but both were very well received. The features I am working on require changes to the upstream Clang APIs in order to enable modern tooling, so I was traveling to EuroLLVM to try to build some buy-in and desire for those features.
I previously delivered a talk on the same topic about AST Matchers at code::dive 2018. This week I presented updates to the tools and features that I have worked on during the 6 months since.
One of the new features I presented is a method of debugging AST Matchers.
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Introduction to the Python Calendar Module
Python has an built-in module named Calendar that contains useful classes and functions to support a variety of calendar operations. By default, the Calendar module follows the Gregorian calendar, where Monday is the first day (0) of the week and Sunday is the last day of the week (6).
In Python, datetime and time modules also provide low-level calendar-related functionalities. In addition to these modules, the Calendar module provides essential functions related to displaying and manipulating calendars.
To print and manipulate calendars, the Calendar module has 3 important classes: Calendar, TextCalendar, and HTMLCalendar. In this article, we will see how these classes can help implement a variety of calendar related functions.
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digiKam 7.7.0 is released
After three months of active maintenance and another bug triage, the digiKam team is proud to present version 7.7.0 of its open source digital photo manager. See below the list of most important features coming with this release.
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Dilution and Misuse of the "Linux" Brand
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Samsung, Red Hat to Work on Linux Drivers for Future Tech
The metaverse is expected to uproot system design as we know it, and Samsung is one of many hardware vendors re-imagining data center infrastructure in preparation for a parallel 3D world.
Samsung is working on new memory technologies that provide faster bandwidth inside hardware for data to travel between CPUs, storage and other computing resources. The company also announced it was partnering with Red Hat to ensure these technologies have Linux compatibility.
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today's howtos
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C++ Knocks Python From Top Three Popular Programming Languages
C++ Knocks Python From Top Three Popular Programming Languages