Like most programmers, I keep going to some projects to copy some bits of code. From now on, I'm going to list them in one place.



Make a video of the evolution of a git repo

gource --hide dirnames,filenames --seconds-per-day 0.1 --auto-skip-seconds 1 -1280x720 -o - | ffmpeg -y -r 60 -f image2pipe -vcodec ppm -i - -vcodec libx264 -preset ultrafast -pix_fmt yuv420p -crf 1 -threads 0 -bf 0 gource.mp4


Custom Errors

To create custom errors

class AgeNotInRangeError(Exception):
Exception raised for errors in the input age.

- age - age which caused the error
- message - explanation of the error

def __init__(self, age, message="Age is not in range"):
self.age = age
self.message = message

def __str__(self):
return f'{self.age} -> {self.message}'

age = int(input("Enter age amount: "))
if age <= 18:
raise AgeNotInRangeError(age)


To do some test-driven development, create a file at tests/test_{name}.py with some tests:

import unittest

class TestEvents(unittest.TestCase):
def test_{name}(self):
self.assertEqual(1, 1)

To run the tests, use python -m unittest discover -s tests/


Create a model with a created_at and udpated_at:

class MyModel(models.Model):
# ...
created_at = models.DateTimeField(auto_now_add=True)
updated_at = models.DateTimeField(auto_now=True)

Typescript and/or javascript

Custom Errors

To create custom errors

class HttpStatusError extends Error {
private data: Errors
private status: number

constructor(status: number, data: Errors) {
const message = `Got status ${status} for request`
super(message) = 'HttpStatusError' = data
this.status = status

To use and throw them

throw new HttpStatusError(500, { error: 'Try again later' })

Later, to catch and use them

if (err instanceof HttpStatusError) {
// ...

if ( == 'HttpStatusError') {
// ...


Dump some variable so we can visually inspect it:

<pre>{JSON.stringify(variable, null, 4)}</pre>


Rows and columns

<div class="container mx-auto max-w-6xl mt-8">
<div class="flex border border-blue-600 -mx-4">
<div class="w-1/4 border border-red-600 mx-4">1</div>
<div class="w-1/4 border border-red-600 mx-4">2</div>
<div class="w-1/4 border border-red-600 mx-4">3</div>
<div class="w-1/4 border border-red-600 mx-4">4</div>