from __future__ import annotations | |
import typing as T | |
from enum import Enum | |
from pydantic import BaseModel | |
from pydantic.fields import ModelField | |
import strawberry | |
from strawberry.field import StrawberryField | |
from strawberry.types.types import TypeDefinition |
# ⚠️ USE AT YOUR OWN RISK | |
# first: pip install pysqlite3-binary | |
# then in settings.py: | |
# these three lines swap the stdlib sqlite3 lib with the pysqlite3 package | |
__import__('pysqlite3') | |
import sys | |
sys.modules['sqlite3'] = sys.modules.pop('pysqlite3') | |
DATABASES = { |
• 45-minute systems interview, focus on responding to real world problems with an unhealthy service, such as a web server or database. The interview will start off at a high level troubleshooting a likely scenario, dig deeper to find the cause and some possible solutions for it. The goal is to probe your knowledge of systems at scale and under load, so keep in mind the challenges of the Facebook environment.
• Focus on things such as tooling, memory management and unix process lifecycle.
More specifically, linux troubleshooting and debugging. Understanding things like memory, io, cpu, shell, memory etc. would be pretty helpful. Knowing how to actually write a unix shell would also be a good idea. What tools might you use to debug something? On another note, this interview will likely push your boundaries of what you know (and how to implement it).
Interview is all about taking an ambiguous question of how you might build a system and letting
""" | |
Django ORM Optimization Tips | |
Caveats: | |
* Only use optimizations that obfuscate the code if you need to. | |
* Not all of these tips are hard and fast rules. | |
* Use your judgement to determine what improvements are appropriate for your code. | |
""" | |
# --------------------------------------------------------------------------- |
The computer driven markets for instruments like stocks and exchange traded stock options, have transformed finance and the flow of capital. These markets are enabled by order matching engines (and the infrastructure that supports this software). Before computer trading networks and matching engines, stocks where traded on cavernous exchange floors and transaction costs where high. When electronic trading fully matured, floor traders were a fading anachronism and transaction costs had been reduced to pennies a share in many cases. Electronic trading could not exist without advanced network infrastructure, but without the software matching engines no shares would change hands. The computer trading networks, the matching engine software has also created a concentrated nexus of potential failure. Failures in these systems have increased as the frequency and volume on the electronic networks has increased. The position of order matching engines in the trading infrastructure makes these systems o
This is a compiled list of falsehoods programmers tend to believe about working with time.
Don't re-invent a date time library yourself. If you think you understand everything about time, you're probably doing it wrong.
- There are always 24 hours in a day.
- February is always 28 days long.
- Any 24-hour period will always begin and end in the same day (or week, or month).
# Use envFrom to load Secrets and ConfigMaps into environment variables | |
apiVersion: apps/v1beta2 | |
kind: Deployment | |
metadata: | |
name: mans-not-hot | |
labels: | |
app: mans-not-hot | |
spec: | |
replicas: 1 |
$ zmv -n '(.)(<->)(.[^.]#)' '$1$(($2+1))$3' # would rename x.0001.y to x.2.y. $ zmv -n '(.0#)(<->)(.[^.]#)' '$1$(($2+1))$3'
$ zmv '*' '${(L)f}'
$ autoload zmv