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# How to find a missing number from a list?
>>> a=[1,2,3,4,5,7,8,9,10]
>>> sum(xrange(a[0],a[-1]+1)) - sum(a)
6

def is_matched(expression):
    """
    Finds out how balanced an expression is.
    With a string containing only brackets.

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# --- iterators ---
# Если у объекта есть методы __iter__() __next__() значит он является итератором

class MyIter(object):
    
    def __init__(self, start, stop):
        self._current = start
        self._stop  = stop
      
    def __iter__(self):

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# _____________________________________________________
def roman_to_arabic(line):
    roman_numerals = {
        'I': 1,
        'V': 5,
        'X': 10,
        'L': 50,
        'C': 100,
        'D': 500,
        'M': 1000

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class Phonebook:
    def __init__(self):
        self.entries = {}
    
    def add(self, name, number):
        self.entries[name] = number
    
    def lookup(self, name):
        return self.entries[name]
        

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#!/usr/bin/python
# -*- coding: utf-8 -*-

import subprocess


def output(color, message='empty message'):
    colors = {
    'blue' : '\033[94m',
    'green' : '\033[92m',

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import requests
from bs4 import BeautifulSoup as bs
import sys
 
def get_track_status(track_number):
    base_url = 'http://novaposhta.ua/ru/tracking/?cargo_number='
    headers = {'Accept-Language':'ru-RU,ru;q=0.8,en-US;q=0.5,en;q=0.3'}
    data = requests.get(base_url + track_number, headers=headers)
    data.encoding = 'utf-8'
    soup = bs(data.text)

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import psutil


for proc in psutil.process_iter():
    try:
        proc = proc.as_dict(attrs=['pid', 'name'])
    except psutil.NoSuchProcess:
        pass
    else:
        if proc['name'] == 'firefox':

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>>> def decorate(func):
...     print u"Декорируем %s..." % func.__name__,
...     def wrapped(*args, **kwargs):
...         print "Вызываем обёрнутую функцию с аргументами:", args
...         return func(*args, **kwargs)
...     print u"выполнено!"
...     return wrapped


import logging

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for i in `mysql -uroot porta-configurator -sse "select ip from Servers"`
do
    h=`mysql -uroot porta-configurator -sse "select Name from Servers where IP='$i'"`
    echo -e "\n====== $h $i ======\n"
    rsh_porta.sh $i '
        red=`echo -en "\e[31m"` 
        green=`echo -en "\e[32m"`
        normal=`echo -en "\e[0m"`
        lightyellow=`echo -en "\e[93m"`
        if [ $(grep -qi gateway /etc/sysconfig/network; echo "$?") -eq 0 ]