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# encoding: utf-8

"""Utilities for working with data structures like lists, dicts and tuples.

"""

#-----------------------------------------------------------------------------

# Copyright (C) 2008-2011 The IPython Development Team

#

# Distributed under the terms of the BSD License. The full license is in

# the file COPYING, distributed as part of this software.

#-----------------------------------------------------------------------------

def uniq_stable(elems):

"""uniq_stable(elems) -> list

Return from an iterable, a list of all the unique elements in the input,

but maintaining the order in which they first appear.

Note: All elements in the input must be hashable for this routine

to work, as it internally uses a set for efficiency reasons.

"""

seen = set()

return [x for x in elems if x not in seen and not seen.add(x)]

def flatten(seq):

"""Flatten a list of lists (NOT recursive, only works for 2d lists)."""

return [x for subseq in seq for x in subseq]

def chop(seq, size):

"""Chop a sequence into chunks of the given size."""

return [seq[i:i+size] for i in xrange(0,len(seq),size)]