# Copyright (C) 2007 Alex Drummond <a.d.drummond@gmail.com>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor,
# Boston, MA  02110-1301, USA.

"""
This module contains some iterators.
"""

def drop(n, it):
    it = iter(it)
    for i in xrange(n):
        it.next()
    return it

def first(it, otherwise=None):
    it = iter(it)
    try:
        return it.next()
    except StopIteration:
        return otherwise

