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<div class="highlight" style="background: #f8f8f8"><pre style="line-height: 125%"><div id="lc1">def ranges(iterable):
</div><div id="lc2"> delimiter = &#39;-&#39;
</div><div id="lc3"> iterable = iter(sorted(set(iterable)))
</div><div id="lc4"> stop = start = iterable.next()
</div><div id="lc5"> while True:
</div><div id="lc6"> try:
</div><div id="lc7"> cur = iterable.next()
</div><div id="lc8"> if cur - stop == 1:
</div><div id="lc9"> stop = cur
</div><div id="lc10"> else:
</div><div id="lc11"> yield yield_range(start, stop, delimiter)
</div><div id="lc12"> stop = start = cur
</div><div id="lc13"> except StopIteration:
</div><div id="lc14"> yield yield_range(start, stop, delimiter)
</div><div id="lc15"> raise StopIteration
</div><div id="lc16">
</div><div id="lc17">def yield_range(start, stop, delimiter):
</div><div id="lc18"> if start == stop:
</div><div id="lc19"> return str(stop)
</div><div id="lc20"> else:
</div><div id="lc21"> return &quot;%d%s%d&quot; % (start, delimiter, stop)
</div><div id="lc22">
</div><div id="lc23">if __name__ == &#39;__main__&#39;:
</div><div id="lc24"> print &#39;, &#39;.join(ranges([1, 1, 2, 3, 5, 6, 11]))
</div><div id="lc25"> print &#39;, &#39;.join(ranges([1, 3, 4, 7, 7, 12, 13]))
</div><div id="lc26"> print &#39;, &#39;.join(ranges([1, 2, 3, 4, 7, 8]))
</div><div id="lc27"> print &#39;, &#39;.join(ranges([13, 17, 20, 27, 28, 29, 50]))
</div></pre></div>
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[color=#008000][b]def[/b][/color] [color=#0000FF]ranges[/color](iterable):
    delimiter [color=#666666]=[/color] [color=#BA2121]'-'[/color]
    iterable [color=#666666]=[/color] [color=#008000]iter[/color]([color=#008000]sorted[/color]([color=#008000]set[/color](iterable)))
    stop [color=#666666]=[/color] start [color=#666666]=[/color] iterable[color=#666666].[/color]next()
    [color=#008000][b]while[/b][/color] [color=#008000]True[/color]:
        [color=#008000][b]try[/b][/color]:
            cur [color=#666666]=[/color] iterable[color=#666666].[/color]next()
            [color=#008000][b]if[/b][/color] cur [color=#666666]-[/color] stop [color=#666666]==[/color] [color=#666666]1[/color]:
                stop [color=#666666]=[/color] cur
            [color=#008000][b]else[/b][/color]:
                [color=#008000][b]yield[/b][/color] yield_range(start, stop, delimiter)
                stop [color=#666666]=[/color] start [color=#666666]=[/color] cur
        [color=#008000][b]except[/b][/color] [color=#D2413A][b]StopIteration[/b][/color]:
            [color=#008000][b]yield[/b][/color] yield_range(start, stop, delimiter)
            [color=#008000][b]raise[/b][/color] [color=#D2413A][b]StopIteration[/b][/color]

[color=#008000][b]def[/b][/color] [color=#0000FF]yield_range[/color](start, stop, delimiter):
    [color=#008000][b]if[/b][/color] start [color=#666666]==[/color] stop:
        [color=#008000][b]return[/b][/color] [color=#008000]str[/color](stop)
    [color=#008000][b]else[/b][/color]:
        [color=#008000][b]return[/b][/color] [color=#BA2121]"[/color][color=#BB6688][b]%d%s%d[/b][/color][color=#BA2121]"[/color] [color=#666666]%[/color] (start, delimiter, stop)

[color=#008000][b]if[/b][/color] __name__ [color=#666666]==[/color] [color=#BA2121]'__main__'[/color]:
    [color=#008000][b]print[/b][/color] [color=#BA2121]', '[/color][color=#666666].[/color]join(ranges([[color=#666666]1[/color], [color=#666666]1[/color], [color=#666666]2[/color], [color=#666666]3[/color], [color=#666666]5[/color], [color=#666666]6[/color], [color=#666666]11[/color]]))
    [color=#008000][b]print[/b][/color] [color=#BA2121]', '[/color][color=#666666].[/color]join(ranges([[color=#666666]1[/color], [color=#666666]3[/color], [color=#666666]4[/color], [color=#666666]7[/color], [color=#666666]7[/color], [color=#666666]12[/color], [color=#666666]13[/color]]))
    [color=#008000][b]print[/b][/color] [color=#BA2121]', '[/color][color=#666666].[/color]join(ranges([[color=#666666]1[/color], [color=#666666]2[/color], [color=#666666]3[/color], [color=#666666]4[/color], [color=#666666]7[/color], [color=#666666]8[/color]]))
    [color=#008000][b]print[/b][/color] [color=#BA2121]', '[/color][color=#666666].[/color]join(ranges([[color=#666666]13[/color], [color=#666666]17[/color], [color=#666666]20[/color], [color=#666666]27[/color], [color=#666666]28[/color], [color=#666666]29[/color], [color=#666666]50[/color]]))

--------------------------------------
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<div class="highlight"><pre><div id="lc1">def ranges(iterable):
</div><div id="lc2"> delimiter = &#39;-&#39;
</div><div id="lc3"> iterable = iter(sorted(set(iterable)))
</div><div id="lc4"> stop = start = iterable.next()
</div><div id="lc5"> while True:
</div><div id="lc6"> try:
</div><div id="lc7"> cur = iterable.next()
</div><div id="lc8"> if cur - stop == 1:
</div><div id="lc9"> stop = cur
</div><div id="lc10"> else:
</div><div id="lc11"> yield yield_range(start, stop, delimiter)
</div><div id="lc12"> stop = start = cur
</div><div id="lc13"> except StopIteration:
</div><div id="lc14"> yield yield_range(start, stop, delimiter)
</div><div id="lc15"> raise StopIteration
</div><div id="lc16">
</div><div id="lc17">def yield_range(start, stop, delimiter):
</div><div id="lc18"> if start == stop:
</div><div id="lc19"> return str(stop)
</div><div id="lc20"> else:
</div><div id="lc21"> return &quot;%d%s%d&quot; % (start, delimiter, stop)
</div><div id="lc22">
</div><div id="lc23">if __name__ == &#39;__main__&#39;:
</div><div id="lc24"> print &#39;, &#39;.join(ranges([1, 1, 2, 3, 5, 6, 11]))
</div><div id="lc25"> print &#39;, &#39;.join(ranges([1, 3, 4, 7, 7, 12, 13]))
</div><div id="lc26"> print &#39;, &#39;.join(ranges([1, 2, 3, 4, 7, 8]))
</div><div id="lc27"> print &#39;, &#39;.join(ranges([13, 17, 20, 27, 28, 29, 50]))
</div></pre></div>
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<blockquote><code>def&nbsp;ranges(iterable):
&nbsp;&nbsp;&nbsp;&nbsp;delimiter&nbsp;=&nbsp;&#39;-&#39;
&nbsp;&nbsp;&nbsp;&nbsp;iterable&nbsp;=&nbsp;iter(sorted(set(iterable)))
&nbsp;&nbsp;&nbsp;&nbsp;stop&nbsp;=&nbsp;start&nbsp;=&nbsp;iterable.next()
&nbsp;&nbsp;&nbsp;&nbsp;while&nbsp;True:
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;try:
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;cur&nbsp;=&nbsp;iterable.next()
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;cur&nbsp;-&nbsp;stop&nbsp;==&nbsp;1:
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;stop&nbsp;=&nbsp;cur
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;else:
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;yield&nbsp;yield_range(start,&nbsp;stop,&nbsp;delimiter)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;stop&nbsp;=&nbsp;start&nbsp;=&nbsp;cur
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;except&nbsp;StopIteration:
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;yield&nbsp;yield_range(start,&nbsp;stop,&nbsp;delimiter)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;raise&nbsp;StopIteration

def&nbsp;yield_range(start,&nbsp;stop,&nbsp;delimiter):
&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;start&nbsp;==&nbsp;stop:
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;str(stop)
&nbsp;&nbsp;&nbsp;&nbsp;else:
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;&quot;%d%s%d&quot;&nbsp;%&nbsp;(start,&nbsp;delimiter,&nbsp;stop)

if&nbsp;__name__&nbsp;==&nbsp;&#39;__main__&#39;:
&nbsp;&nbsp;&nbsp;&nbsp;print&nbsp;&#39;,&nbsp;&#39;.join(ranges([1,&nbsp;1,&nbsp;2,&nbsp;3,&nbsp;5,&nbsp;6,&nbsp;11]))
&nbsp;&nbsp;&nbsp;&nbsp;print&nbsp;&#39;,&nbsp;&#39;.join(ranges([1,&nbsp;3,&nbsp;4,&nbsp;7,&nbsp;7,&nbsp;12,&nbsp;13]))
&nbsp;&nbsp;&nbsp;&nbsp;print&nbsp;&#39;,&nbsp;&#39;.join(ranges([1,&nbsp;2,&nbsp;3,&nbsp;4,&nbsp;7,&nbsp;8]))
&nbsp;&nbsp;&nbsp;&nbsp;print&nbsp;&#39;,&nbsp;&#39;.join(ranges([13,&nbsp;17,&nbsp;20,&nbsp;27,&nbsp;28,&nbsp;29,&nbsp;50]))
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