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annotate tvii/unique.py @ 52:0b3daccfc36c

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[documentation] link to lore python lib
author Jeff Hammel <k0scist@gmail.com>
date Sat, 23 Sep 2017 11:18:15 -0700
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1 class NotUnique(Exception):
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2 """exception for a set of items that are not unique"""
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4 msg_tmpl = "Not unique: {items}"
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6 def __init__(self, multiples):
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7 self.multiples = multiples
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8 message = self.msg_tmpl.format(items=', '.join([str(item)
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9 for item in multiples]))
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10 Exception.__init__(self, message)
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13 def unique(items):
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14 """asserts that a `items` is a set of one"""
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16 types = set(items)
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17 unique = types.pop()
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18 if types:
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19 types.add(unique)
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20 raise NotUnique(types)
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21 return unique