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39 lines
938 B
Python
39 lines
938 B
Python
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"""
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Implement the Schwartizan Transform method of sorting
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a list by an arbitrary metric (see the Python FAQ section
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4.51).
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--------------------------------------------------------------------
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This program is licensed under the GNU General Public License (GPL)
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Version 3. See http://www.fsf.org for details of the license.
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Rugged Circuits LLC
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http://ruggedcircuits.com/gerbmerge
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"""
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def stripit(pair):
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return pair[1]
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def schwartz(List, Metric):
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def pairing(element, M = Metric):
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return (M(element), element)
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paired = map(pairing, List)
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paired.sort()
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return map(stripit, paired)
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def stripit2(pair):
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return pair[0]
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def schwartz2(List, Metric):
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"Returns sorted list and also corresponding metrics"
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def pairing(element, M = Metric):
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return (M(element), element)
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paired = map(pairing, List)
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paired.sort()
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theList = map(stripit, paired)
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theMetrics = map(stripit2, paired)
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return (theList, theMetrics)
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