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# Copyright (C) 2004 Aaron Bentley
# <aaron.bentley@utoronto.ca>
#
# 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
__docformat__ = "restructuredtext"
__doc__ = "A miscellany of stuff"
class rewind_iterator:
"""A rewindable iterator wrapper"""
def __init__(self, base_iterator):
"""Initializer.
:param base_iterator: The iterator to make rewindable
:type base_iterator: Iterable of anything
"""
self.base_iterator = base_iterator.__iter__()
self.read_items = []
self.list_iterator = self.read_items.__iter__()
self.use_list = True
def next(self):
if self.use_list:
try:
return self.list_iterator.next()
except StopIteration:
self.use_list = False
item = self.base_iterator.next()
self.read_items.append(item)
return item
def rewind(self):
"""Rewind and start iterating again from the sequence beginning."""
self.use_list = True
self.list_iterator = self.read_items.__iter__()
def __iter__(self):
return self
def invert_dict(dict):
newdict = {}
for (key,value) in dict.iteritems():
newdict[value] = key
return newdict
# arch-tag: 9573f21a-15c4-4b9a-9f26-e744b3a58aa5
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