MihailJP

function clone (t) -- deep-copy a table
    if type(t) ~= "table" then return t end
    local meta = getmetatable(t)
    local target = {}
    for k, v in pairs(t) do
        if type(v) == "table" then
            target[k] = clone(v)
        else
            target[k] = v
        end

lbolla

Asynchronous programming with Tornado

Asynchronous programming can be tricky for beginners, therefore I think it's useful to iron some basic concepts to avoid common pitfalls.

For an explanation about generic asynchronous programming, I recommend you one of the [many][2] [resources][3] [online][4].

I will focus on solely on asynchronous programming in [Tornado][1]. From Tornado's homepage:

progrium

import gevent
import gevent.pool

class GroupWithExceptionCatching(gevent.pool.Group):
    def __init__(self, *args):
        super(GroupWithExceptionCatching, self).__init__(*args)
        self._error_handlers = {}
    
    def _wrap_errors(self, func):
        """Wrap a callable for triggering error handlers