DeveloperLoad - DeveloperLoad

Django / DRF: annotate a model with extra (computed) information

I'm adding a very simple roadmap voting feature to my website, where people can add feature requests, and people can then vote on each other's suggestions. The

python ros melodic ImportError: libcv_bridge.so: cannot open shared object file: No such file or directory

Ubuntu 18.04 LTS and ros 1.14 I run a code to extract png from bag with ubuntu 18's default python 2.7.17 and I got the error message that I'm missing a .so fil

Getting City from IP Address range

I have an IP address. For example, 192.168.2.10 Also I have a dictionary: RANGES = { 'london': [ {'start': '10.10.0.0', 'end': '10.10.255.25

Try to implement a mutex like in java, debugging succeed but run failed

I want to implement a mutex in java similar to mutex in C++. So i write a simple class "Mutex". Here is my code: public class Mutex implements Lock { privat

Dropping duplicate spark data frame rows based on the first occurrence of schema values

If I'm working with a table like so as a Spark dataframe: received userId 2022-01-07 06:23:02 se23289 2022-01-03 22:21:33 se23289 2022-01-16 18:01:45 se1235

PHP: Split string [duplicate]

How do I split a string by . delimiter in PHP? For example, if I have the string "a.b", how do I get "a"?

How can I place a GLTF model behind a stencil mask in three.js?

I'm using a stencil mask in Three.js to create a portal effect. It works correctly on meshes when I can control the material. However, when I load a gltf model