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contract PaymentHub {
uint256 public constant CHALLENGE_PERIOD = 7 days;
address public paymentHubOwner;
mapping(address => uint256) public balances;
mapping(address => uint256) public withdrawRequests;
function PaymentHub(address _paymentHubOwner)
public
@Geoyi
Geoyi / python_environment_setup.md
Created January 20, 2018 19:01 — forked from wronk/python_environment_setup.md
Setting up your python development environment (with pyenv, virtualenv, and virtualenvwrapper)

Overview

When you're working on multiple coding projects, you might want a couple different version of Python and/or modules installed. That way you can keep each project in its own sandbox instead of trying to juggle multiple projects (each with different dependencies) on your system's version of Python. This intermediate guide covers one way to handle multiple Python versions and Python environments on your own (i.e., without a package manager like conda). See the Using the workflow section to view the end result.

Use cases

  1. Working on 2+ projects that each have their own dependencies; e.g., a Python 2.7 project and a Python 3.6 project, or developing a module that needs to work across multiple versions of Python. It's not reasonable to uninstall/reinstall modules every time you want to switch environments.
  2. If you want to execute code on the cloud, you can set up a Python environment that mirrors the relevant
@bstancil
bstancil / Finding User Sessions with SQL
Last active October 18, 2023 16:07
These queries let you define find user sessions against event data logged to Segment SQL, Snowplow, or Google BigQuery.
-- These queries let you define find user sessions against event data
-- logged to Segment SQL, Snowplow, or Google BigQuery.
-- For more details, see the full post:
-- LINK
--- SEGMENT SQL
-- Finding the start of every session
SELECT *
FROM (
@dergachev
dergachev / GIF-Screencast-OSX.md
Last active March 20, 2024 18:46
OS X Screencast to animated GIF

OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.

Screencapture GIF

Instructions

To capture the video (filesize: 19MB), using the free "QuickTime Player" application:

@rgreenjr
rgreenjr / postgres_queries_and_commands.sql
Last active March 27, 2024 19:48
Useful PostgreSQL Queries and Commands
-- show running queries (pre 9.2)
SELECT procpid, age(clock_timestamp(), query_start), usename, current_query
FROM pg_stat_activity
WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%'
ORDER BY query_start desc;
-- show running queries (9.2)
SELECT pid, age(clock_timestamp(), query_start), usename, query
FROM pg_stat_activity
WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%'