Skip to content

Instantly share code, notes, and snippets.

View ettorerizza's full-sized avatar
🏠
Working from home

Ettore Rizza ettorerizza

🏠
Working from home
View GitHub Profile

Falsehoods programmers believe about prices

  1. You can store a price in a floating point variable.
  2. All currencies are subdivided in 1/100th units (like US dollar/cents, euro/eurocents etc.).
  3. All currencies are subdivided in decimal units (like dinar/fils)
  4. All currencies currently in circulation are subdivided in decimal units. (to exclude shillings, pennies) (counter-example: MGA)
  5. All currencies are subdivided. (counter-examples: KRW, COP, JPY... Or subdivisions can be deprecated.)
  6. Prices can't have more precision than the smaller sub-unit of the currency. (e.g. gas prices)
  7. For any currency you can have a price of 1. (ZWL)
  8. Every country has its own currency. (EUR is the best example, but also Franc CFA, etc.)
// XPath CheatSheet
// To test XPath in your Chrome Debugger: $x('/html/body')
// http://www.jittuu.com/2012/2/14/Testing-XPath-In-Chrome/
// 0. XPath Examples.
// More: http://xpath.alephzarro.com/content/cheatsheet.html
'//hr[@class="edge" and position()=1]' // every first hr of 'edge' class
@stevenswafford
stevenswafford / google-dorks
Created June 6, 2015 05:57
Listing of a number of useful Google dorks.
" _ _ "
" _ /|| . . ||\ _ "
" ( } \||D ' ' ' C||/ { % "
" | /\__,=_[_] ' . . ' [_]_=,__/\ |"
" |_\_ |----| |----| _/_|"
" | |/ | | | | \| |"
" | /_ | | | | _\ |"
It is all fun and games until someone gets hacked!
@alexander-yakushev
alexander-yakushev / latex-cheatsheet-template.tex
Last active March 8, 2024 20:50
Beautiful cheatsheet template for key bindings, compiled with XeLaTeX
%% Copyright 2020 Alexander Yakushev
%
% This work may be distributed and/or modified under the
% conditions of the LaTeX Project Public License, either version 1.3
% of this license or (at your option) any later version.
% The latest version of this license is in
% http://www.latex-project.org/lppl.txt
% and version 1.3 or later is part of all distributions of LaTeX
% version 2005/12/01 or later.
%
@fredbenenson
fredbenenson / kickstarter_sql_style_guide.md
Last active April 2, 2024 15:19
Kickstarter SQL Style Guide
layout title description tags
default
SQL Style Guide
A guide to writing clean, clear, and consistent SQL.
data
process

Purpose

# 10_basic.py
# 15_make_soup.py
# 20_search.py
# 25_navigation.py
# 30_edit.py
# 40_encoding.py
# 50_parse_only_part.py
@malkitsingh
malkitsingh / instructions.txt
Created February 2, 2017 17:37
Step by step guide to install nominatim server
I followed these two blogs to install server
1. http://koo.fi/blog/2015/03/19/openstreetmap-nominatim-server-for-geocoding/#Compile_Nominatim
This explains ( and is the main blog which I followed) various steps
2. https://www.linuxbabe.com/linux-server/openstreetmap-tile-server-ubuntu-16-04
This explains how to setup swap files and install tiles if needed.
I will use Ubuntu 14.04 LTS as the platform. Just a basic install with ssh server. We will install Apache to serve http requests. Make sure you have enough disk space and RAM to hold the data and serve it efficiently. I used the Finland extract, which was about a 200 MB download. The resulting database was 26 GB after importing, indexing and adding Wikipedia data. The Wikipedia data probably actually took more disk space than the OSM data. My server has 4 GB RAM, which seems to be enough for this small data set.
1. Sofware requirements
/*
===================================================
Generate MERGE Statements for All Tables
===================================================
Copyright: Eitan Blumin (C) 2012
Email: eitan@madeiradata.com
Source: www.madeiradata.com
Disclaimer:
The author is not responsible for any damage this
@petesql
petesql / count_rows_within_csv_files.ps1
Created January 24, 2019 20:10
count_rows_within_csv_files
# Count rows within CSV files, in a specified directory.
Get-ChildItem "C:\myfolder\" -re -in "*.csv" |
Foreach-Object {
$fileStats = Get-Content $_.FullName | Measure-Object -line
$linesInFile = $fileStats.Lines -1
Write-Host "$_,$linesInFile"
}