Understand your Mac and iPhone more deeply by tracing the evolution of Mac OS X from prelease to Swift. John Siracusa delivers the details.
You've got two main options:
""" | |
How to update JSONField based on the value of another field. | |
For example: | |
class MyModel(models.Model): | |
name = models.CharField(...) | |
data = models.JSONField() | |
How to update the MyModel table to store the `name` field inside the `data` |
Magic words:
psql -U postgres
Some interesting flags (to see all, use -h
or --help
depending on your psql version):
-E
: will describe the underlaying queries of the \
commands (cool for learning!)-l
: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)This page collects common comments made during reviews of Go code, so that a single detailed explanation can be referred to by shorthands. This is a laundry list of common mistakes, not a style guide.
You can view this as a supplement to http://golang.org/doc/effective_go.html.
Please discuss changes before editing this page, even minor ones. Many people have opinions and this is not the place for edit wars.
# aproducer.py | |
# | |
# Async Producer-consumer problem. | |
# Challenge: How to implement the same functionality, but no threads. | |
import time | |
from collections import deque | |
import heapq | |
class Scheduler: |
Whether you're trying to give back to the open source community or collaborating on your own projects, knowing how to properly fork and generate pull requests is essential. Unfortunately, it's quite easy to make mistakes or not know what you should do when you're initially learning the process. I know that I certainly had considerable initial trouble with it, and I found a lot of the information on GitHub and around the internet to be rather piecemeal and incomplete - part of the process described here, another there, common hangups in a different place, and so on.
In an attempt to coallate this information for myself and others, this short tutorial is what I've found to be fairly standard procedure for creating a fork, doing your work, issuing a pull request, and merging that pull request back into the original project.
Just head over to the GitHub page and click the "Fork" button. It's just that simple. Once you've done that, you can use your favorite git client to clone your repo or j
// create a bookmark and use this code as the URL, you can now toggle the css on/off | |
// thanks+credit: https://dev.to/gajus/my-favorite-css-hack-32g3 | |
javascript: (function() { | |
var elements = document.body.getElementsByTagName('*'); | |
var items = []; | |
for (var i = 0; i < elements.length; i++) { | |
if (elements[i].innerHTML.indexOf('* { background:#000!important;color:#0f0!important;outline:solid #f00 1px!important; background-color: rgba(255,0,0,.2) !important; }') != -1) { | |
items.push(elements[i]); | |
} | |
} |
import json, datetime | |
class RoundTripEncoder(json.JSONEncoder): | |
DATE_FORMAT = "%Y-%m-%d" | |
TIME_FORMAT = "%H:%M:%S" | |
def default(self, obj): | |
if isinstance(obj, datetime.datetime): | |
return { | |
"_type": "datetime", | |
"value": obj.strftime("%s %s" % ( |