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<div class="section" id="module-uuid">
<h1>20.15. <tt class="xref docutils literal"><span class="pre">uuid</span></tt> — UUID objects according to RFC 4122<a class="headerlink" href="#module-uuid" title="Permalink to this headline">¶</a></h1>
<p class="versionadded">
<span class="versionmodified">New in version 2.5.</span></p>
<p>This module provides immutable <a title="uuid.UUID" class="reference internal" href="#uuid.UUID"><tt class="xref docutils literal"><span class="pre">UUID</span></tt></a> objects (the <a title="uuid.UUID" class="reference internal" href="#uuid.UUID"><tt class="xref docutils literal"><span class="pre">UUID</span></tt></a> class)
and the functions <a title="uuid.uuid1" class="reference internal" href="#uuid.uuid1"><tt class="xref docutils literal"><span class="pre">uuid1()</span></tt></a>, <a title="uuid.uuid3" class="reference internal" href="#uuid.uuid3"><tt class="xref docutils literal"><span class="pre">uuid3()</span></tt></a>, <a title="uuid.uuid4" class="reference internal" href="#uuid.uuid4"><tt class="xref docutils literal"><span class="pre">uuid4()</span></tt></a>, <a title="uuid.uuid5" class="reference internal" href="#uuid.uuid5"><tt class="xref docutils literal"><span class="pre">uuid5()</span></tt></a> for
generating version 1, 3, 4, and 5 UUIDs as specified in <span class="target" id="index-732"></span><a class="reference external" href="http://tools.ietf.org/html/rfc4122.html"><strong>RFC 4122</strong></a>.</p>
<p>If all you want is a unique ID, you should probably call <a title="uuid.uuid1" class="reference internal" href="#uuid.uuid1"><tt class="xref docutils literal"><span class="pre">uuid1()</span></tt></a> or
<a title="uuid.uuid4" class="reference internal" href="#uuid.uuid4"><tt class="xref docutils literal"><span class="pre">uuid4()</span></tt></a>. Note that <a title="uuid.uuid1" class="reference internal" href="#uuid.uuid1"><tt class="xref docutils literal"><span class="pre">uuid1()</span></tt></a> may compromise privacy since it creates
a UUID containing the computer’s network address. <a title="uuid.uuid4" class="reference internal" href="#uuid.uuid4"><tt class="xref docutils literal"><span class="pre">uuid4()</span></tt></a> creates a
random UUID.</p>
<dl class="class">
<dt id="uuid.UUID">
<em class="property">class </em><tt class="descclassname">uuid.</tt><tt class="descname">UUID</tt><big>(</big><span class="optional">[</span><em>hex</em><span class="optional">[</span>, <em>bytes</em><span class="optional">[</span>, <em>bytes_le</em><span class="optional">[</span>, <em>fields</em><span class="optional">[</span>, <em>int</em><span class="optional">[</span>, <em>version</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#uuid.UUID" title="Permalink to this definition">¶</a></dt>
<dd><p>Create a UUID from either a string of 32 hexadecimal digits, a string of 16
bytes as the <em>bytes</em> argument, a string of 16 bytes in little-endian order as
the <em>bytes_le</em> argument, a tuple of six integers (32-bit <em>time_low</em>, 16-bit
<em>time_mid</em>, 16-bit <em>time_hi_version</em>, 8-bit <em>clock_seq_hi_variant</em>, 8-bit
<em>clock_seq_low</em>, 48-bit <em>node</em>) as the <em>fields</em> argument, or a single 128-bit
integer as the <em>int</em> argument. When a string of hex digits is given, curly
braces, hyphens, and a URN prefix are all optional. For example, these
expressions all yield the same UUID:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="n">UUID</span><span class="p">(</span><span class="s">'{12345678-1234-5678-1234-567812345678}'</span><span class="p">)</span>
<span class="n">UUID</span><span class="p">(</span><span class="s">'12345678123456781234567812345678'</span><span class="p">)</span>
<span class="n">UUID</span><span class="p">(</span><span class="s">'urn:uuid:12345678-1234-5678-1234-567812345678'</span><span class="p">)</span>
<span class="n">UUID</span><span class="p">(</span><span class="nb">bytes</span><span class="o">=</span><span class="s">'</span><span class="se">\x12\x34\x56\x78</span><span class="s">'</span><span class="o">*</span><span class="mi">4</span><span class="p">)</span>
<span class="n">UUID</span><span class="p">(</span><span class="n">bytes_le</span><span class="o">=</span><span class="s">'</span><span class="se">\x78\x56\x34\x12\x34\x12\x78\x56</span><span class="s">'</span> <span class="o">+</span>
<span class="s">'</span><span class="se">\x12\x34\x56\x78\x12\x34\x56\x78</span><span class="s">'</span><span class="p">)</span>
<span class="n">UUID</span><span class="p">(</span><span class="n">fields</span><span class="o">=</span><span class="p">(</span><span class="mh">0x12345678</span><span class="p">,</span> <span class="mh">0x1234</span><span class="p">,</span> <span class="mh">0x5678</span><span class="p">,</span> <span class="mh">0x12</span><span class="p">,</span> <span class="mh">0x34</span><span class="p">,</span> <span class="mh">0x567812345678</span><span class="p">))</span>
<span class="n">UUID</span><span class="p">(</span><span class="nb">int</span><span class="o">=</span><span class="mh">0x12345678123456781234567812345678</span><span class="p">)</span>
</pre></div>
</div>
<p>Exactly one of <em>hex</em>, <em>bytes</em>, <em>bytes_le</em>, <em>fields</em>, or <em>int</em> must be given.
The <em>version</em> argument is optional; if given, the resulting UUID will have its
variant and version number set according to RFC 4122, overriding bits in the
given <em>hex</em>, <em>bytes</em>, <em>bytes_le</em>, <em>fields</em>, or <em>int</em>.</p>
</dd></dl>
<p><a title="uuid.UUID" class="reference internal" href="#uuid.UUID"><tt class="xref docutils literal"><span class="pre">UUID</span></tt></a> instances have these read-only attributes:</p>
<dl class="attribute">
<dt id="uuid.UUID.bytes">
<tt class="descclassname">UUID.</tt><tt class="descname">bytes</tt><a class="headerlink" href="#uuid.UUID.bytes" title="Permalink to this definition">¶</a></dt>
<dd>The UUID as a 16-byte string (containing the six integer fields in big-endian
byte order).</dd></dl>
<dl class="attribute">
<dt id="uuid.UUID.bytes_le">
<tt class="descclassname">UUID.</tt><tt class="descname">bytes_le</tt><a class="headerlink" href="#uuid.UUID.bytes_le" title="Permalink to this definition">¶</a></dt>
<dd>The UUID as a 16-byte string (with <em>time_low</em>, <em>time_mid</em>, and <em>time_hi_version</em>
in little-endian byte order).</dd></dl>
<dl class="attribute">
<dt id="uuid.UUID.fields">
<tt class="descclassname">UUID.</tt><tt class="descname">fields</tt><a class="headerlink" href="#uuid.UUID.fields" title="Permalink to this definition">¶</a></dt>
<dd><p>A tuple of the six integer fields of the UUID, which are also available as six
individual attributes and two derived attributes:</p>
<table border="1" class="docutils">
<colgroup>
<col width="49%" />
<col width="51%" />
</colgroup>
<thead valign="bottom">
<tr><th class="head">Field</th>
<th class="head">Meaning</th>
</tr>
</thead>
<tbody valign="top">
<tr><td><tt class="xref docutils literal"><span class="pre">time_low</span></tt></td>
<td>the first 32 bits of the UUID</td>
</tr>
<tr><td><tt class="xref docutils literal"><span class="pre">time_mid</span></tt></td>
<td>the next 16 bits of the UUID</td>
</tr>
<tr><td><tt class="xref docutils literal"><span class="pre">time_hi_version</span></tt></td>
<td>the next 16 bits of the UUID</td>
</tr>
<tr><td><tt class="xref docutils literal"><span class="pre">clock_seq_hi_variant</span></tt></td>
<td>the next 8 bits of the UUID</td>
</tr>
<tr><td><tt class="xref docutils literal"><span class="pre">clock_seq_low</span></tt></td>
<td>the next 8 bits of the UUID</td>
</tr>
<tr><td><tt class="xref docutils literal"><span class="pre">node</span></tt></td>
<td>the last 48 bits of the UUID</td>
</tr>
<tr><td><tt class="xref docutils literal"><span class="pre">time</span></tt></td>
<td>the 60-bit timestamp</td>
</tr>
<tr><td><tt class="xref docutils literal"><span class="pre">clock_seq</span></tt></td>
<td>the 14-bit sequence number</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="attribute">
<dt id="uuid.UUID.hex">
<tt class="descclassname">UUID.</tt><tt class="descname">hex</tt><a class="headerlink" href="#uuid.UUID.hex" title="Permalink to this definition">¶</a></dt>
<dd>The UUID as a 32-character hexadecimal string.</dd></dl>
<dl class="attribute">
<dt id="uuid.UUID.int">
<tt class="descclassname">UUID.</tt><tt class="descname">int</tt><a class="headerlink" href="#uuid.UUID.int" title="Permalink to this definition">¶</a></dt>
<dd>The UUID as a 128-bit integer.</dd></dl>
<dl class="attribute">
<dt id="uuid.UUID.urn">
<tt class="descclassname">UUID.</tt><tt class="descname">urn</tt><a class="headerlink" href="#uuid.UUID.urn" title="Permalink to this definition">¶</a></dt>
<dd>The UUID as a URN as specified in RFC 4122.</dd></dl>
<dl class="attribute">
<dt id="uuid.UUID.variant">
<tt class="descclassname">UUID.</tt><tt class="descname">variant</tt><a class="headerlink" href="#uuid.UUID.variant" title="Permalink to this definition">¶</a></dt>
<dd>The UUID variant, which determines the internal layout of the UUID. This will be
one of the integer constants <a title="uuid.RESERVED_NCS" class="reference internal" href="#uuid.RESERVED_NCS"><tt class="xref docutils literal"><span class="pre">RESERVED_NCS</span></tt></a>, <a title="uuid.RFC_4122" class="reference internal" href="#uuid.RFC_4122"><tt class="xref docutils literal"><span class="pre">RFC_4122</span></tt></a>,
<a title="uuid.RESERVED_MICROSOFT" class="reference internal" href="#uuid.RESERVED_MICROSOFT"><tt class="xref docutils literal"><span class="pre">RESERVED_MICROSOFT</span></tt></a>, or <a title="uuid.RESERVED_FUTURE" class="reference internal" href="#uuid.RESERVED_FUTURE"><tt class="xref docutils literal"><span class="pre">RESERVED_FUTURE</span></tt></a>.</dd></dl>
<dl class="attribute">
<dt id="uuid.UUID.version">
<tt class="descclassname">UUID.</tt><tt class="descname">version</tt><a class="headerlink" href="#uuid.UUID.version" title="Permalink to this definition">¶</a></dt>
<dd>The UUID version number (1 through 5, meaningful only when the variant is
<a title="uuid.RFC_4122" class="reference internal" href="#uuid.RFC_4122"><tt class="xref docutils literal"><span class="pre">RFC_4122</span></tt></a>).</dd></dl>
<p>The <tt class="xref docutils literal"><span class="pre">uuid</span></tt> module defines the following functions:</p>
<dl class="function">
<dt id="uuid.getnode">
<tt class="descclassname">uuid.</tt><tt class="descname">getnode</tt><big>(</big><big>)</big><a class="headerlink" href="#uuid.getnode" title="Permalink to this definition">¶</a></dt>
<dd>Get the hardware address as a 48-bit positive integer. The first time this
runs, it may launch a separate program, which could be quite slow. If all
attempts to obtain the hardware address fail, we choose a random 48-bit number
with its eighth bit set to 1 as recommended in RFC 4122. “Hardware address”
means the MAC address of a network interface, and on a machine with multiple
network interfaces the MAC address of any one of them may be returned.</dd></dl>
<span class="target" id="index-733"></span><dl class="function">
<dt id="uuid.uuid1">
<tt class="descclassname">uuid.</tt><tt class="descname">uuid1</tt><big>(</big><span class="optional">[</span><em>node</em><span class="optional">[</span>, <em>clock_seq</em><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#uuid.uuid1" title="Permalink to this definition">¶</a></dt>
<dd>Generate a UUID from a host ID, sequence number, and the current time. If <em>node</em>
is not given, <a title="uuid.getnode" class="reference internal" href="#uuid.getnode"><tt class="xref docutils literal"><span class="pre">getnode()</span></tt></a> is used to obtain the hardware address. If
<em>clock_seq</em> is given, it is used as the sequence number; otherwise a random
14-bit sequence number is chosen.</dd></dl>
<span class="target" id="index-734"></span><dl class="function">
<dt id="uuid.uuid3">
<tt class="descclassname">uuid.</tt><tt class="descname">uuid3</tt><big>(</big><em>namespace</em>, <em>name</em><big>)</big><a class="headerlink" href="#uuid.uuid3" title="Permalink to this definition">¶</a></dt>
<dd>Generate a UUID based on the MD5 hash of a namespace identifier (which is a
UUID) and a name (which is a string).</dd></dl>
<span class="target" id="index-735"></span><dl class="function">
<dt id="uuid.uuid4">
<tt class="descclassname">uuid.</tt><tt class="descname">uuid4</tt><big>(</big><big>)</big><a class="headerlink" href="#uuid.uuid4" title="Permalink to this definition">¶</a></dt>
<dd>Generate a random UUID.</dd></dl>
<span class="target" id="index-736"></span><dl class="function">
<dt id="uuid.uuid5">
<tt class="descclassname">uuid.</tt><tt class="descname">uuid5</tt><big>(</big><em>namespace</em>, <em>name</em><big>)</big><a class="headerlink" href="#uuid.uuid5" title="Permalink to this definition">¶</a></dt>
<dd>Generate a UUID based on the SHA-1 hash of a namespace identifier (which is a
UUID) and a name (which is a string).</dd></dl>
<p id="index-737">The <tt class="xref docutils literal"><span class="pre">uuid</span></tt> module defines the following namespace identifiers for use with
<a title="uuid.uuid3" class="reference internal" href="#uuid.uuid3"><tt class="xref docutils literal"><span class="pre">uuid3()</span></tt></a> or <a title="uuid.uuid5" class="reference internal" href="#uuid.uuid5"><tt class="xref docutils literal"><span class="pre">uuid5()</span></tt></a>.</p>
<dl class="data">
<dt id="uuid.NAMESPACE_DNS">
<tt class="descclassname">uuid.</tt><tt class="descname">NAMESPACE_DNS</tt><a class="headerlink" href="#uuid.NAMESPACE_DNS" title="Permalink to this definition">¶</a></dt>
<dd>When this namespace is specified, the <em>name</em> string is a fully-qualified domain
name.</dd></dl>
<dl class="data">
<dt id="uuid.NAMESPACE_URL">
<tt class="descclassname">uuid.</tt><tt class="descname">NAMESPACE_URL</tt><a class="headerlink" href="#uuid.NAMESPACE_URL" title="Permalink to this definition">¶</a></dt>
<dd>When this namespace is specified, the <em>name</em> string is a URL.</dd></dl>
<dl class="data">
<dt id="uuid.NAMESPACE_OID">
<tt class="descclassname">uuid.</tt><tt class="descname">NAMESPACE_OID</tt><a class="headerlink" href="#uuid.NAMESPACE_OID" title="Permalink to this definition">¶</a></dt>
<dd>When this namespace is specified, the <em>name</em> string is an ISO OID.</dd></dl>
<dl class="data">
<dt id="uuid.NAMESPACE_X500">
<tt class="descclassname">uuid.</tt><tt class="descname">NAMESPACE_X500</tt><a class="headerlink" href="#uuid.NAMESPACE_X500" title="Permalink to this definition">¶</a></dt>
<dd>When this namespace is specified, the <em>name</em> string is an X.500 DN in DER or a
text output format.</dd></dl>
<p>The <tt class="xref docutils literal"><span class="pre">uuid</span></tt> module defines the following constants for the possible values
of the <tt class="xref docutils literal"><span class="pre">variant</span></tt> attribute:</p>
<dl class="data">
<dt id="uuid.RESERVED_NCS">
<tt class="descclassname">uuid.</tt><tt class="descname">RESERVED_NCS</tt><a class="headerlink" href="#uuid.RESERVED_NCS" title="Permalink to this definition">¶</a></dt>
<dd>Reserved for NCS compatibility.</dd></dl>
<dl class="data">
<dt id="uuid.RFC_4122">
<tt class="descclassname">uuid.</tt><tt class="descname">RFC_4122</tt><a class="headerlink" href="#uuid.RFC_4122" title="Permalink to this definition">¶</a></dt>
<dd>Specifies the UUID layout given in <span class="target" id="index-738"></span><a class="reference external" href="http://tools.ietf.org/html/rfc4122.html"><strong>RFC 4122</strong></a>.</dd></dl>
<dl class="data">
<dt id="uuid.RESERVED_MICROSOFT">
<tt class="descclassname">uuid.</tt><tt class="descname">RESERVED_MICROSOFT</tt><a class="headerlink" href="#uuid.RESERVED_MICROSOFT" title="Permalink to this definition">¶</a></dt>
<dd>Reserved for Microsoft compatibility.</dd></dl>
<dl class="data">
<dt id="uuid.RESERVED_FUTURE">
<tt class="descclassname">uuid.</tt><tt class="descname">RESERVED_FUTURE</tt><a class="headerlink" href="#uuid.RESERVED_FUTURE" title="Permalink to this definition">¶</a></dt>
<dd>Reserved for future definition.</dd></dl>
<div class="admonition-see-also admonition seealso">
<p class="first admonition-title">See also</p>
<dl class="last docutils">
<dt><span class="target" id="index-739"></span><a class="reference external" href="http://tools.ietf.org/html/rfc4122.html"><strong>RFC 4122</strong></a> - A Universally Unique IDentifier (UUID) URN Namespace</dt>
<dd>This specification defines a Uniform Resource Name namespace for UUIDs, the
internal format of UUIDs, and methods of generating UUIDs.</dd>
</dl>
</div>
<div class="section" id="example">
<span id="uuid-example"></span><h2>20.15.1. Example<a class="headerlink" href="#example" title="Permalink to this headline">¶</a></h2>
<p>Here are some examples of typical usage of the <tt class="xref docutils literal"><span class="pre">uuid</span></tt> module:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">uuid</span>
<span class="go"># make a UUID based on the host ID and current time</span>
<span class="gp">>>> </span><span class="n">uuid</span><span class="o">.</span><span class="n">uuid1</span><span class="p">()</span>
<span class="go">UUID('a8098c1a-f86e-11da-bd1a-00112444be1e')</span>
<span class="go"># make a UUID using an MD5 hash of a namespace UUID and a name</span>
<span class="gp">>>> </span><span class="n">uuid</span><span class="o">.</span><span class="n">uuid3</span><span class="p">(</span><span class="n">uuid</span><span class="o">.</span><span class="n">NAMESPACE_DNS</span><span class="p">,</span> <span class="s">'python.org'</span><span class="p">)</span>
<span class="go">UUID('6fa459ea-ee8a-3ca4-894e-db77e160355e')</span>
<span class="go"># make a random UUID</span>
<span class="gp">>>> </span><span class="n">uuid</span><span class="o">.</span><span class="n">uuid4</span><span class="p">()</span>
<span class="go">UUID('16fd2706-8baf-433b-82eb-8c7fada847da')</span>
<span class="go"># make a UUID using a SHA-1 hash of a namespace UUID and a name</span>
<span class="gp">>>> </span><span class="n">uuid</span><span class="o">.</span><span class="n">uuid5</span><span class="p">(</span><span class="n">uuid</span><span class="o">.</span><span class="n">NAMESPACE_DNS</span><span class="p">,</span> <span class="s">'python.org'</span><span class="p">)</span>
<span class="go">UUID('886313e1-3b8a-5372-9b90-0c9aee199e5d')</span>
<span class="go"># make a UUID from a string of hex digits (braces and hyphens ignored)</span>
<span class="gp">>>> </span><span class="n">x</span> <span class="o">=</span> <span class="n">uuid</span><span class="o">.</span><span class="n">UUID</span><span class="p">(</span><span class="s">'{00010203-0405-0607-0809-0a0b0c0d0e0f}'</span><span class="p">)</span>
<span class="go"># convert a UUID to a string of hex digits in standard form</span>
<span class="gp">>>> </span><span class="nb">str</span><span class="p">(</span><span class="n">x</span><span class="p">)</span>
<span class="go">'00010203-0405-0607-0809-0a0b0c0d0e0f'</span>
<span class="go"># get the raw 16 bytes of the UUID</span>
<span class="gp">>>> </span><span class="n">x</span><span class="o">.</span><span class="n">bytes</span>
<span class="go">'\x00\x01\x02\x03\x04\x05\x06\x07\x08\t\n\x0b\x0c\r\x0e\x0f'</span>
<span class="go"># make a UUID from a 16-byte string</span>
<span class="gp">>>> </span><span class="n">uuid</span><span class="o">.</span><span class="n">UUID</span><span class="p">(</span><span class="nb">bytes</span><span class="o">=</span><span class="n">x</span><span class="o">.</span><span class="n">bytes</span><span class="p">)</span>
<span class="go">UUID('00010203-0405-0607-0809-0a0b0c0d0e0f')</span>
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