avalanchy’s gists

avalanchy / __init__.py

Created August 28, 2024 08:26

factory boy override django auto_now_add

	from typing import Generic, TypeVar, get_args

	import factory
	from factory.base import FactoryMetaClass


	def _override_auto_now_add_fields(obj, kwargs):
	"""
	That's a built-in "feature" of Django: when a field has auto_now_add=True, Django will override any provided value
	with django.utils.timezone.now() ; this happens "after" factory_boy's code runs.

avalanchy / ipython.py

Created March 15, 2024 05:56

python date datetime isinstance

	$ ipython
	Python 3.12.2 (main, Mar 5 2024, 10:30:14) [GCC 13.2.0]
	Type 'copyright', 'credits' or 'license' for more information
	IPython 8.20.0 -- An enhanced Interactive Python. Type '?' for help.

	In [1]: from datetime import datetime, date

	In [2]: dt = datetime.now()

	In [3]: d = dt.date()

avalanchy / druid_nulls.md

Created February 7, 2022 10:45

Apache Druid differences in aggregation results when uising default value for null is disabled (druid.generic.useDefaultValueForNull = False)

aggregator	type	op before	op after	res before	res after	same res
longSum, doubleSum	regular	0 + 0	0 + null	0	0	TRUE
longSum, doubleSum	regular	0 + 0	null + null	0	null	FALSE
longLast, doubleLast and longLastTimestamp	regular	Pick 0	Pick null	0	null	FALSE
longMax	regular	[0, -1]	[0, -1]	0	0	TRUE
longMax	regular	[0, -1]	[null, -1]	0	-1	FALSE
doubleMean	regular	[0, 1]	[0, 1]	0,5	0,5	TRUE
doubleMean	regular	[0, 1]	[null, 1]	0,5	0,5	TRUE

avalanchy / product_of_pairs.py

Created January 31, 2022 08:09

python function that returns cartesian prodict of two lists containing only pairs

	def product_of_pairs(iterable1, iterable2, item_sorting_key=None):
	"""Function that returns cartesian product of two lists. Output is filtered to contain only pairs, where pair
	means item cannot be with itself and AB == BA.
	Example:
	>>> product_of_pairs('ab', 'ab')
	{('a', 'b')}
	"""
	return {
	tuple(sorted((item1, item2), key=item_sorting_key))
	for item1 in iterable1

avalanchy / as_list.py

Last active October 18, 2024 06:58

python cast function output to specifc type. most commonly decorate generator to return a list.

	def as_list(func: Callable[..., Iterator[T]]) -> Callable[..., list[T]]:
	"""Decorator that casts the output of the function to a list.

	Example:
	>>> @as_list
	... def foo():
	... yield 123
	...
	>>> foo()
	[123]

avalanchy / schema.py

Last active March 22, 2021 20:13

python dict list schema

avalanchy / chunk_dict.py

Last active November 9, 2020 13:41

python 2/3 chunk_dict utility

	from types import GeneratorType

	import six


	def chunk_dict(dict_, size):
	chunk = {}
	for i, (key, val) in enumerate(six.iteritems(dict_), start=1):
	chunk[key] = val
	if i % size == 0:

avalanchy / siepomaga.js

Last active July 10, 2020 08:14

Ile wplacono poprzez X na siepomaga.pl

	let amount = parseFloat(document.querySelector(".amount").innerText.replace(" ", "").replace(",", "."))
	let payments = document.querySelectorAll(".sp-payment-amount");

	let paymentSum = 0;
	for (let payment of payments) {
	const paymentFloat = parseFloat(payment.innerText);
	if (isNaN(paymentFloat))
	continue;
	paymentSum += paymentFloat;
	}

avalanchy / factories_lookup.py

Last active February 8, 2019 06:29

List all factory boy factories in a way expected by shell_plus command from django-extensions. Python 3.7.

	import pathlib
	import re


	def factories_lookup(base_dir):
	"""Yields all model factories in a way expected by shell_plus command.

	Returned generator is evaluated only when running shell_plus. Evaluation
	itself on my machine takes ± 3.63 ms.

avalanchy / serializers.py

Last active July 31, 2018 08:10

django rest framework: object out - primary key in field

	from rest_framework import relations
	from rest_framework.serializers import ModelSerializer


	class ObjectOutPkInField(relations.RelatedField):
	"""Field serializer wrapper which as normal returns related object
	but as the input accepts object's PK (primary key).

	Example usage:
	>>> class TypicalModelSerializer(ModelSerializer):

Mariusz Osiecki avalanchy