Как получить список n-грамм в четыре строки*

n = 3
with open('/path/to/file') as my_file:
    words = my_file.read().split()
ngrams = zip(*[words[i:] for i in range(n)])

* хорошо бы еще нормализовать регистры, морфологию и пунктуацию до этого

via http://www.quora.com/Python-programming-language-1/What-are-some-cool-Python-tricks#

The Zen of Python, by Tim Peters

Beautiful is better than ugly.
Explicit is better than implicit.
Simple is better than complex.
Complex is better than complicated.
Flat is better than nested.
Sparse is better than dense.
Readability counts.
Special cases aren’t special enough to break the rules.
Although practicality beats purity.
Errors should never pass silently.
Unless explicitly silenced.
In the face of ambiguity, refuse the temptation to guess.
There should be one— and preferably only one —obvious way to do it.
Although that way may not be obvious at first unless you’re Dutch.
Now is better than never.
Although never is often better than *right* now.
If the implementation is hard to explain, it’s a bad idea.
If the implementation is easy to explain, it may be a good idea.
Namespaces are one honking great idea — let’s do more of those!

Декораторы в Python — это обертки для функций. (Или функции, получающие в качестве параметров другую функции)
Например

@dec2
@dec1
def func(arg1, arg2, ...):
    pass

— то же самое, что и:

def func(arg1, arg2, ...):
    pass
func = dec2(dec1(func))

via PEP 318

Краткий мануал (по мотивам  http://git-scm.com/book/ru)

Ставим git

$ apt-get install git

Конфигурируем

$ git config --global user.name "John Doe"
$ git config --global user.email johndoe@example.com

Инициализируем, добавляем файлы, создаем коммит, создаем новый репозиторий и загружаем в репозиторий

touch README.md
git init
git add README.md
git commit -m "first commit"
git remote add origin https://github.com/username/projectname.git
git push -u origin master

Выгружаем с репозитория
git fetch origin master

Создаем локальную папку с содержимым репозитория
git clone git://github.com/username/projectname.git