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1# encoding: utf-8
2"""Utilities for working with data structures like lists, dicts and tuples.
3"""
5#-----------------------------------------------------------------------------
6# Copyright (C) 2008-2011 The IPython Development Team
7#
8# Distributed under the terms of the BSD License. The full license is in
9# the file COPYING, distributed as part of this software.
10#-----------------------------------------------------------------------------
13def uniq_stable(elems):
14 """uniq_stable(elems) -> list
16 Return from an iterable, a list of all the unique elements in the input,
17 but maintaining the order in which they first appear.
19 Note: All elements in the input must be hashable for this routine
20 to work, as it internally uses a set for efficiency reasons.
21 """
22 seen = set()
23 return [x for x in elems if x not in seen and not seen.add(x)]
26def chop(seq, size):
27 """Chop a sequence into chunks of the given size."""
28 return [seq[i:i+size] for i in range(0,len(seq),size)]