Xarkam

• sudo apt-get install xclip
• Configure spectacle to use Rectangular Selection, default save to /some/path/Screenshot_%Y%M%D_%H%m%S
• Configure PrintScreen for rectangular selection via custom shortcuts
• Try it - once you select the area and hit enter it should show the pop-up notification about saved file.
• On this notification select the settings button
• In the notification settings enable "Run command" and set it as /usr/bin/xclip -selection clipboard -target image/png -i $(ls -1tr /some/path/Screenshot_*.png | tail -n 1)

staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

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This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

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jacobian

from django.db import models

class Person(models.Model):
    name = models.CharField(max_length=200)
    groups = models.ManyToManyField('Group', through='GroupMember', related_name='people')
    
    class Meta:
        ordering = ['name']
    
    def __unicode__(self):