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<div class="highlight" style="background: #f8f8f8"><pre style="line-height: 125%"><div id="lc1"><span style="color: #008000; font-weight: bold">def</span> <span style="color: #0000FF">zip_files</span>(<span style="color: #666666">*</span>args):
</div><div id="lc2">    <span style="color: #BA2121; font-style: italic">&quot;&quot;&quot;Heil iterators!&quot;&quot;&quot;</span>
</div><div id="lc3">
</div><div id="lc4">    <span style="color: #008000; font-weight: bold">from</span> <span style="color: #0000FF; font-weight: bold">itertools</span> <span style="color: #008000; font-weight: bold">import</span> ifilter, chain, izip_longest
</div><div id="lc5">
</div><div id="lc6">    <span style="color: #008000; font-weight: bold">for</span> line <span style="color: #AA22FF; font-weight: bold">in</span> ifilter(<span style="color: #008000">None</span>, chain<span style="color: #666666">.</span>from_iterable(izip_longest(<span style="color: #666666">*</span><span style="color: #008000">map</span>(<span style="color: #008000">open</span>, args)))):
</div><div id="lc7">        <span style="color: #008000; font-weight: bold">yield</span> line
</div><div id="lc8">
</div><div id="lc9"><span style="color: #008000; font-weight: bold">def</span> <span style="color: #0000FF">sorted_streams</span>(<span style="color: #666666">*</span>args):
</div><div id="lc10">    <span style="color: #BA2121; font-style: italic">&quot;&quot;&quot;Get sorted stream from a mix of pre-sorted files&quot;&quot;&quot;</span>
</div><div id="lc11">
</div><div id="lc12">    layer <span style="color: #666666">=</span> [(<span style="color: #008000">False</span>, <span style="color: #008000">open</span>(fn)) <span style="color: #008000; font-weight: bold">for</span> fn <span style="color: #AA22FF; font-weight: bold">in</span> args]
</div><div id="lc13">    <span style="color: #008000; font-weight: bold">while</span> layer:
</div><div id="lc14">        layer<span style="color: #666666">.</span>sort()
</div><div id="lc15">        cur, stream <span style="color: #666666">=</span> layer[<span style="color: #666666">0</span>]
</div><div id="lc16">
</div><div id="lc17">        <span style="color: #008000; font-weight: bold">if</span> cur <span style="color: #AA22FF; font-weight: bold">is</span> <span style="color: #008000">False</span>:
</div><div id="lc18">            cur <span style="color: #666666">=</span> stream<span style="color: #666666">.</span>readline()
</div><div id="lc19">            <span style="color: #008000; font-weight: bold">if</span> cur <span style="color: #666666">==</span> <span style="color: #BA2121">&#39;&#39;</span>:
</div><div id="lc20">                layer <span style="color: #666666">=</span> layer[<span style="color: #666666">1</span>:]
</div><div id="lc21">                <span style="color: #008000; font-weight: bold">continue</span>
</div><div id="lc22">           layer[<span style="color: #666666">0</span>] <span style="color: #666666">=</span> <span style="color: #008000">int</span>(cur), stream
</div><div id="lc23">        <span style="color: #008000; font-weight: bold">else</span>:
</div><div id="lc24">            layer[<span style="color: #666666">0</span>] <span style="color: #666666">=</span> <span style="color: #008000">False</span>, stream
</div><div id="lc25">            <span style="color: #008000; font-weight: bold">yield</span> cur
</div></pre></div>
<p style="padding: 0; margin: 2em 0 1em 0; font-size: 0.8em; color: #666;"><span style="padding: 0 1em; background-color: #f5f5f5;"> Colored with <a style="color: #333" href="http://dumpz.org">dumpz.org</a></span></p>

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[color=#008000][b]def[/b][/color] [color=#0000FF]zip_files[/color]([color=#666666]*[/color]args):
    [color=#BA2121][i]"""Heil iterators!"""[/i][/color]

[color=#008000][b]from[/b][/color] [color=#0000FF][b]itertools[/b][/color] [color=#008000][b]import[/b][/color] ifilter, chain, izip_longest

[color=#008000][b]for[/b][/color] line [color=#AA22FF][b]in[/b][/color] ifilter([color=#008000]None[/color], chain[color=#666666].[/color]from_iterable(izip_longest([color=#666666]*[/color][color=#008000]map[/color]([color=#008000]open[/color], args)))):
        [color=#008000][b]yield[/b][/color] line

[color=#008000][b]def[/b][/color] [color=#0000FF]sorted_streams[/color]([color=#666666]*[/color]args):
    [color=#BA2121][i]"""Get sorted stream from a mix of pre-sorted files"""[/i][/color]

layer [color=#666666]=[/color] [([color=#008000]False[/color], [color=#008000]open[/color](fn)) [color=#008000][b]for[/b][/color] fn [color=#AA22FF][b]in[/b][/color] args]
    [color=#008000][b]while[/b][/color] layer:
        layer[color=#666666].[/color]sort()
        cur, stream [color=#666666]=[/color] layer[[color=#666666]0[/color]]

[color=#008000][b]if[/b][/color] cur [color=#AA22FF][b]is[/b][/color] [color=#008000]False[/color]:
            cur [color=#666666]=[/color] stream[color=#666666].[/color]readline()
            [color=#008000][b]if[/b][/color] cur [color=#666666]==[/color] [color=#BA2121]''[/color]:
                layer [color=#666666]=[/color] layer[[color=#666666]1[/color]:]
                [color=#008000][b]continue[/b][/color]
           layer[[color=#666666]0[/color]] [color=#666666]=[/color] [color=#008000]int[/color](cur), stream
        [color=#008000][b]else[/b][/color]:
            layer[[color=#666666]0[/color]] [color=#666666]=[/color] [color=#008000]False[/color], stream
            [color=#008000][b]yield[/b][/color] cur

--------------------------------------
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<div class="highlight"><pre><div id="lc1"><span class="k">def</span> <span class="nf">zip_files</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">):</span>
</div><div id="lc2">    <span class="sd">&quot;&quot;&quot;Heil iterators!&quot;&quot;&quot;</span>
</div><div id="lc3">
</div><div id="lc4">    <span class="kn">from</span> <span class="nn">itertools</span> <span class="kn">import</span> <span class="n">ifilter</span><span class="p">,</span> <span class="n">chain</span><span class="p">,</span> <span class="n">izip_longest</span>
</div><div id="lc5">
</div><div id="lc6">    <span class="k">for</span> <span class="n">line</span> <span class="ow">in</span> <span class="n">ifilter</span><span class="p">(</span><span class="bp">None</span><span class="p">,</span> <span class="n">chain</span><span class="o">.</span><span class="n">from_iterable</span><span class="p">(</span><span class="n">izip_longest</span><span class="p">(</span><span class="o">*</span><span class="nb">map</span><span class="p">(</span><span class="nb">open</span><span class="p">,</span> <span class="n">args</span><span class="p">)))):</span>
</div><div id="lc7">        <span class="k">yield</span> <span class="n">line</span>
</div><div id="lc8">
</div><div id="lc9"><span class="k">def</span> <span class="nf">sorted_streams</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">):</span>
</div><div id="lc10">    <span class="sd">&quot;&quot;&quot;Get sorted stream from a mix of pre-sorted files&quot;&quot;&quot;</span>
</div><div id="lc11">
</div><div id="lc12">    <span class="n">layer</span> <span class="o">=</span> <span class="p">[(</span><span class="bp">False</span><span class="p">,</span> <span class="nb">open</span><span class="p">(</span><span class="n">fn</span><span class="p">))</span> <span class="k">for</span> <span class="n">fn</span> <span class="ow">in</span> <span class="n">args</span><span class="p">]</span>
</div><div id="lc13">    <span class="k">while</span> <span class="n">layer</span><span class="p">:</span>
</div><div id="lc14">        <span class="n">layer</span><span class="o">.</span><span class="n">sort</span><span class="p">()</span>
</div><div id="lc15">        <span class="n">cur</span><span class="p">,</span> <span class="n">stream</span> <span class="o">=</span> <span class="n">layer</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
</div><div id="lc16">
</div><div id="lc17">        <span class="k">if</span> <span class="n">cur</span> <span class="ow">is</span> <span class="bp">False</span><span class="p">:</span>
</div><div id="lc18">            <span class="n">cur</span> <span class="o">=</span> <span class="n">stream</span><span class="o">.</span><span class="n">readline</span><span class="p">()</span>
</div><div id="lc19">            <span class="k">if</span> <span class="n">cur</span> <span class="o">==</span> <span class="s">&#39;&#39;</span><span class="p">:</span>
</div><div id="lc20">                <span class="n">layer</span> <span class="o">=</span> <span class="n">layer</span><span class="p">[</span><span class="mi">1</span><span class="p">:]</span>
</div><div id="lc21">                <span class="k">continue</span>
</div><div id="lc22">           <span class="n">layer</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">cur</span><span class="p">),</span> <span class="n">stream</span>
</div><div id="lc23">        <span class="k">else</span><span class="p">:</span>
</div><div id="lc24">            <span class="n">layer</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">=</span> <span class="bp">False</span><span class="p">,</span> <span class="n">stream</span>
</div><div id="lc25">            <span class="k">yield</span> <span class="n">cur</span>
</div></pre></div>
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<blockquote><code><font color="#008000"><strong>def</strong></font>&nbsp;<font color="#0000FF">zip_files</font>(<font color="#666666">*</font>args):
&nbsp;&nbsp;&nbsp;&nbsp;<font color="#BA2121"><em>&quot;&quot;&quot;Heil&nbsp;iterators!&quot;&quot;&quot;</em></font>

&nbsp;&nbsp;&nbsp;&nbsp;<font color="#008000"><strong>from</strong></font>&nbsp;<font color="#0000FF"><strong>itertools</strong></font>&nbsp;<font color="#008000"><strong>import</strong></font>&nbsp;ifilter,&nbsp;chain,&nbsp;izip_longest

&nbsp;&nbsp;&nbsp;&nbsp;<font color="#008000"><strong>for</strong></font>&nbsp;line&nbsp;<font color="#AA22FF"><strong>in</strong></font>&nbsp;ifilter(<font color="#008000">None</font>,&nbsp;chain<font color="#666666">.</font>from_iterable(izip_longest(<font color="#666666">*</font><font color="#008000">map</font>(<font color="#008000">open</font>,&nbsp;args)))):
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<font color="#008000"><strong>yield</strong></font>&nbsp;line

<font color="#008000"><strong>def</strong></font>&nbsp;<font color="#0000FF">sorted_streams</font>(<font color="#666666">*</font>args):
&nbsp;&nbsp;&nbsp;&nbsp;<font color="#BA2121"><em>&quot;&quot;&quot;Get&nbsp;sorted&nbsp;stream&nbsp;from&nbsp;a&nbsp;mix&nbsp;of&nbsp;pre-sorted&nbsp;files&quot;&quot;&quot;</em></font>

&nbsp;&nbsp;&nbsp;&nbsp;layer&nbsp;<font color="#666666">=</font>&nbsp;[(<font color="#008000">False</font>,&nbsp;<font color="#008000">open</font>(fn))&nbsp;<font color="#008000"><strong>for</strong></font>&nbsp;fn&nbsp;<font color="#AA22FF"><strong>in</strong></font>&nbsp;args]
&nbsp;&nbsp;&nbsp;&nbsp;<font color="#008000"><strong>while</strong></font>&nbsp;layer:
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;layer<font color="#666666">.</font>sort()
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;cur,&nbsp;stream&nbsp;<font color="#666666">=</font>&nbsp;layer[<font color="#666666">0</font>]

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<font color="#008000"><strong>if</strong></font>&nbsp;cur&nbsp;<font color="#AA22FF"><strong>is</strong></font>&nbsp;<font color="#008000">False</font>:
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;cur&nbsp;<font color="#666666">=</font>&nbsp;stream<font color="#666666">.</font>readline()
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<font color="#008000"><strong>if</strong></font>&nbsp;cur&nbsp;<font color="#666666">==</font>&nbsp;<font color="#BA2121">&#39;&#39;</font>:
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;layer&nbsp;<font color="#666666">=</font>&nbsp;layer[<font color="#666666">1</font>:]
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<font color="#008000"><strong>continue</strong></font>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;layer[<font color="#666666">0</font>]&nbsp;<font color="#666666">=</font>&nbsp;<font color="#008000">int</font>(cur),&nbsp;stream
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<font color="#008000"><strong>else</strong></font>:
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;layer[<font color="#666666">0</font>]&nbsp;<font color="#666666">=</font>&nbsp;<font color="#008000">False</font>,&nbsp;stream
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<font color="#008000"><strong>yield</strong></font>&nbsp;cur
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