bofm

#!/usr/bin/env bash
cp /etc/apt/sources.list /etc/apt/sources.list_bkp
sed -ri 's/\/\/\w+\.ubuntu\.com/\/\/mirror\.yandex\.ru/' /etc/apt/sources.list

# OR
cat /etc/apt/sources.list | \
    python -c 'import re,sys; sys.stdout.write(re.sub(sys.argv[1], sys.argv[2], sys.stdin.read()))' \
    '//\w+\.ubuntu\.com' '//mirror.yandex.ru' > /etc/apt/sources.list1
mv /etc/apt/sources.list1 /etc/apt/sources.list

bofm

my_sed() {
    python -c 'import re,sys; sys.stdout.write(re.sub(sys.argv[1], sys.argv[2], sys.stdin.read()))' "$1" "$2"
}

bofm

from IPython.core.magic import (register_line_magic, register_cell_magic,
                                register_line_cell_magic)
from six import string_types

class T(list): 
    def _repr_html_(self):
        html = [u"<table>"]
        for row in self:
            html.append(u"<tr>")
            

bofm

# Python 3
import random
import string
''.join(random.choice(string.ascii_letters + string.digits + '#$-=_') for n in range(32))

# Python 2
import random
import string
''.join([random.choice(string.ascii_letters + string.digits + '#$-=_') for n in xrange(32)])