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# use mixin
class SingletonMixin(object):

    _instance = None
    
    def __new__(cls, *args, **kwargs):
        if not cls._instance:
            cls._instance = super(SingletonMixin, cls).__new__(cls, *args, **kwargs)
        elif hasattr(cls, '__init__'):
            del cls.__init__

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class RestfulApi(Api):

    def __init__(self, *args, **kwargs):
        self.ignore_errors = kwargs.pop('ignore_errors', [])
        super(RestfulApi, self).__init__(*args, **kwargs)

    def error_router(self, original_handler, e):
        for ignore_error in self.ignore_errors:
            if isinstance(e, ignore_error):
                return original_handler(e)

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# -*- coding: utf-8 -*-

from app.libs.store import store


user_relations = store.Table('user_relations',
                             store.Column('source_id', store.Integer, store.ForeignKey('users.id')),
                             store.Column('target_id', store.Integer, store.ForeignKey('users.id')))

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tmux cheatsheet

As configured in my dotfiles.

start new:

tmux

start new with session name:

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git  --first-parent log
git  --no-merges log

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function sw { svn sw "^/branches/$USER/$1" ;}
function co { svn copy "^/trunk" "^/branches/$USER/$1" ;}
function sl { svn ls "^/branches/$USER" ;}
function swt { svn sw "^/trunk" ;}
function stq { svn st -q ;}
function si { svn info ;}
function su { svn up ;}
function sd { svn diff | colordiff | less -R ;}
function st { svn st;}

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# Enable proxy setting from terminal in ubuntu 12.04
function myProxyOn() {
    gsettings set org.gnome.system.proxy mode 'manual' # ' manual / nome / automatic '
    gsettings set org.gnome.system.proxy.http host '10.8.0.1'
    gsettings set org.gnome.system.proxy.http port 8118
    gsettings set org.gnome.system.proxy.https host '10.8.0.1'
    gsettings set org.gnome.system.proxy.https port 8118
    gsettings set org.gnome.system.proxy.ftp host '10.8.0.1'
    gsettings set org.gnome.system.proxy.ftp port 8118

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Prereq:

apt-get install zsh
apt-get install git-core

Getting zsh to work in ubuntu is weird, since sh does not understand the source command. So, you do this to install zsh

wget https://github.com/robbyrussell/oh-my-zsh/raw/master/tools/install.sh -O - | zsh

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def setup_stub_mc():
    class StubClient(object):
        def __getattr__(self, key):
            def _(*args, **kwargs):
                return None
            return _
    _mc.cache_mc.mc = StubClient()

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from contextlib import contextmanager

class ObjectWrapper(object):
    def __init__(self, wrapped_object):
        self.wrapped_object = wrapped_object

    def __getattr__(self, attr):
        return self.wrapped_object.__getattribute__(attr)

@contextmanager