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31 lines
1015 B
31 lines
1015 B
# encoding: utf-8
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"""Utilities for working with data structures like lists, dicts and tuples.
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2008-2011 The IPython Development Team
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#-----------------------------------------------------------------------------
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def uniq_stable(elems):
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"""uniq_stable(elems) -> list
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Return from an iterable, a list of all the unique elements in the input,
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but maintaining the order in which they first appear.
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Note: All elements in the input must be hashable for this routine
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to work, as it internally uses a set for efficiency reasons.
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"""
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seen = set()
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return [x for x in elems if x not in seen and not seen.add(x)]
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def chop(seq, size):
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"""Chop a sequence into chunks of the given size."""
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return [seq[i:i+size] for i in range(0,len(seq),size)]
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