The C# compiler is pretty smart. For example, let's say you have a function that returns either a string or null.
string? GetString()
{
...
}
var s = GetString()
Then if you try to naively use a string function, it will warn you. Eg. s.Contains(...) will generate warning CS8602: Dereference of a …
I recently came across this video on YouTube. It's a short tutorial on generating a Julia set fractal image in Rust. I've used Rust before but never with image generation or mathematics, so it looked interesting, and I followed along. By the end of the video, you have some code …
read moreWhen writing a cli program that needs the user to make a choice, you might want to present a list of options and get a selection. The simplest way might be to print each option and get the user to type the one or the index of the one they …
read moreLinters and static type checker are great for finding bugs in your code, but sometimes they misunderstand or you have some other reasons for leaving the code as is. In that case you might want to mute the error(s) to allow the linting or type checking to pass, either …
read moreThe go-to library for adding CLI functionality in python is the built in argparse library. This works really well, but there is a relatively new 3rd party library called typer that boasts a number of improvements.
Firstly, with typer, rather than configuring a parser with each argument, you can simply …
read moreWhen performing transactions on the same tables in Postgres from multiple apps, you might face deadlocks.
You might get an error like this one (example from here):
DBAPIError: (TransactionRollbackError) deadlock detected
DETAIL: Process 61086 waits for ExclusiveLock on tuple (7217,55) of relation 626383 of database 380717; blocked by process …This is a summary based on this article.
Rather than specifying test cases, define properties that your functions must fulfil, and let hypothesis generate dozens of test cases automatically.
from hypothesis import given, strategies as st
@given(st.integers(), st.integers())
def test_func(a, b):
# get result
c = func(a …There are multiple reasons why you might want to test the speed of you local network. For example you can test the speed between your router and your device. Or the speed between your device and a home server. For me it was the former. I wanted to make sure …
read moreI decided a while ago that I wanted to to start a blog, but despite GitHub Pages natively supporting Jekyll, I was put off because I didn't want to setup Ruby and the other dependencies just for a static site. Sometime later I was reading this article and I noticed …
read more