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class TrackingDict(dict):
    instances = []

    def __init__(self, dct):
        super(TrackingDict, self).__init__(dct)

        self.used_keys = []
        TrackingDict.instances.append(self)

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import types, time, functools

from twisted.internet import reactor, protocol, threads


# ---


def async(func):
    def wrapper(*args, **kwargs):

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# SETTING                                           DEFAULT
sysctl -w net.ipv4.ip_local_port_range="500 65535"  # 32768 61000
sysctl -w net.ipv4.tcp_tw_recycle="1"               # 0
sysctl -w net.ipv4.tcp_tw_reuse="1"                 # 0

sysctl -w net.ipv4.tcp_rmem="4096 87380 16777216"   # 4096 87380 6291456
sysctl -w net.ipv4.tcp_wmem="4096 16384 16777216"   # 4096 16384 4194304
 
sysctl -w fs.file-max="655300"                      # 797108
sysctl -w fs.nr_open="3000000"                      # 1048576

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#!/usr/bin/env python
import os, sys, shutil


FROM_TO = (
    ('/origin/dir/1', '/destination/dir/1'),
    ('/origin/dir/2', '/destination/dir/2'),
    ('/origin/dir/3', '/destination/dir/3')
    # ...
)

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def init():
    # This wrapper avoids global scope contamination
    import os, sys, atexit, readline, rlcompleter, pprint, glob

    # Enable auto-complete:
    readline.parse_and_bind("tab: complete")

    # Save command history:
    history_path = os.path.expanduser("~/.pyhistory")

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# Dummy
class Redis:
    def send(self, method, key, args, f):
        print method, key, args, f


class Nest(str):

    def __init__(self, key, redis = Redis()):
        super(Nest, self).__init__(key)

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The following transcripts were recorded during human - computer interaction.

C

Programmer: okay, give me the numbers one by one.

Computer: I don't know how to "by" "one" and "one".

P: what? Just... is there a number at the top left of the page?

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class OrderFilterForm(Form):
    name  = CharField(required = False)
    email = CharField(required = False)
    aec   = CharField(required = False)

    date_created_from = DateField(required = False)
    date_created_to   = DateField(required = False)

    def process(self):
        data  = lambda key: self.cleaned_data.get(key, '')

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# ============================================================================ #

# Bienvenido al país de Python! Acá todos hablan python, idioma del que vos por
# ahí no sabés nada. Pero no te preocupes: con esta guía vas a dominar las
# frases más comunes en un toque.

# Lo primero que tenés que entender es que las frases que empiezan con un '#'
# (numeral) son totalmente ignoradas en python. O sea que esta conversación que
# estamos teniendo es completamente privada: nadie en Python se está enterando.

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// Asssignment:
a = b = c;
if (status = result());

// Standard setters:
setA(setB(c));           // No. Setters return void.
if (setStatus(result()); // And again. Impossible.