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  <div class="section" id="module-types">
<span id="types-names-for-built-in-types"></span><h1>8.15. <a class="reference internal" href="#module-types" title="types: Names for built-in types."><code class="xref py py-mod docutils literal notranslate"><span class="pre">types</span></code></a> — Names for built-in types<a class="headerlink" href="#module-types" title="Permalink to this headline">¶</a></h1>
<p><strong>Source code:</strong> <a class="reference external" href="https://github.com/python/cpython/tree/2.7/Lib/types.py">Lib/types.py</a></p>
<hr class="docutils" />
<p>This module defines names for some object types that are used by the standard
Python interpreter, but not for the types defined by various extension modules.
Also, it does not include some of the types that arise during processing such as
the <code class="docutils literal notranslate"><span class="pre">listiterator</span></code> type. It is safe to use <code class="docutils literal notranslate"><span class="pre">from</span> <span class="pre">types</span> <span class="pre">import</span> <span class="pre">*</span></code> — the
module does not export any names besides the ones listed here. New names
exported by future versions of this module will all end in <code class="docutils literal notranslate"><span class="pre">Type</span></code>.</p>
<p>Typical use is for functions that do different things depending on their
argument types, like the following:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">types</span> <span class="k">import</span> <span class="o">*</span>
<span class="k">def</span> <span class="nf">delete</span><span class="p">(</span><span class="n">mylist</span><span class="p">,</span> <span class="n">item</span><span class="p">):</span>
    <span class="k">if</span> <span class="nb">type</span><span class="p">(</span><span class="n">item</span><span class="p">)</span> <span class="ow">is</span> <span class="n">IntType</span><span class="p">:</span>
       <span class="k">del</span> <span class="n">mylist</span><span class="p">[</span><span class="n">item</span><span class="p">]</span>
    <span class="k">else</span><span class="p">:</span>
       <span class="n">mylist</span><span class="o">.</span><span class="n">remove</span><span class="p">(</span><span class="n">item</span><span class="p">)</span>
</pre></div>
</div>
<p>Starting in Python 2.2, built-in factory functions such as <a class="reference internal" href="functions.html#int" title="int"><code class="xref py py-func docutils literal notranslate"><span class="pre">int()</span></code></a> and
<a class="reference internal" href="functions.html#str" title="str"><code class="xref py py-func docutils literal notranslate"><span class="pre">str()</span></code></a> are also names for the corresponding types.  This is now the
preferred way to access the type instead of using the <a class="reference internal" href="#module-types" title="types: Names for built-in types."><code class="xref py py-mod docutils literal notranslate"><span class="pre">types</span></code></a> module.
Accordingly, the example above should be written as follows:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="k">def</span> <span class="nf">delete</span><span class="p">(</span><span class="n">mylist</span><span class="p">,</span> <span class="n">item</span><span class="p">):</span>
    <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">item</span><span class="p">,</span> <span class="nb">int</span><span class="p">):</span>
       <span class="k">del</span> <span class="n">mylist</span><span class="p">[</span><span class="n">item</span><span class="p">]</span>
    <span class="k">else</span><span class="p">:</span>
       <span class="n">mylist</span><span class="o">.</span><span class="n">remove</span><span class="p">(</span><span class="n">item</span><span class="p">)</span>
</pre></div>
</div>
<p>The module defines the following names:</p>
<dl class="data">
<dt id="types.NoneType">
<code class="descclassname">types.</code><code class="descname">NoneType</code><a class="headerlink" href="#types.NoneType" title="Permalink to this definition">¶</a></dt>
<dd><p>The type of <code class="docutils literal notranslate"><span class="pre">None</span></code>.</p>
</dd></dl>

<dl class="data">
<dt id="types.TypeType">
<code class="descclassname">types.</code><code class="descname">TypeType</code><a class="headerlink" href="#types.TypeType" title="Permalink to this definition">¶</a></dt>
<dd><p id="index-0">The type of type objects (such as returned by <a class="reference internal" href="functions.html#type" title="type"><code class="xref py py-func docutils literal notranslate"><span class="pre">type()</span></code></a>); alias of the
built-in <a class="reference internal" href="functions.html#type" title="type"><code class="xref py py-class docutils literal notranslate"><span class="pre">type</span></code></a>.</p>
</dd></dl>

<dl class="data">
<dt id="types.BooleanType">
<code class="descclassname">types.</code><code class="descname">BooleanType</code><a class="headerlink" href="#types.BooleanType" title="Permalink to this definition">¶</a></dt>
<dd><p>The type of the <a class="reference internal" href="functions.html#bool" title="bool"><code class="xref py py-class docutils literal notranslate"><span class="pre">bool</span></code></a> values <code class="docutils literal notranslate"><span class="pre">True</span></code> and <code class="docutils literal notranslate"><span class="pre">False</span></code>; alias of the
built-in <a class="reference internal" href="functions.html#bool" title="bool"><code class="xref py py-class docutils literal notranslate"><span class="pre">bool</span></code></a>.</p>
<div class="versionadded">
<p><span class="versionmodified">New in version 2.3.</span></p>
</div>
</dd></dl>

<dl class="data">
<dt id="types.IntType">
<code class="descclassname">types.</code><code class="descname">IntType</code><a class="headerlink" href="#types.IntType" title="Permalink to this definition">¶</a></dt>
<dd><p>The type of integers (e.g. <code class="docutils literal notranslate"><span class="pre">1</span></code>); alias of the built-in <a class="reference internal" href="functions.html#int" title="int"><code class="xref py py-class docutils literal notranslate"><span class="pre">int</span></code></a>.</p>
</dd></dl>

<dl class="data">
<dt id="types.LongType">
<code class="descclassname">types.</code><code class="descname">LongType</code><a class="headerlink" href="#types.LongType" title="Permalink to this definition">¶</a></dt>
<dd><p>The type of long integers (e.g. <code class="docutils literal notranslate"><span class="pre">1L</span></code>); alias of the built-in <a class="reference internal" href="functions.html#long" title="long"><code class="xref py py-class docutils literal notranslate"><span class="pre">long</span></code></a>.</p>
</dd></dl>

<dl class="data">
<dt id="types.FloatType">
<code class="descclassname">types.</code><code class="descname">FloatType</code><a class="headerlink" href="#types.FloatType" title="Permalink to this definition">¶</a></dt>
<dd><p>The type of floating point numbers (e.g. <code class="docutils literal notranslate"><span class="pre">1.0</span></code>); alias of the built-in
<a class="reference internal" href="functions.html#float" title="float"><code class="xref py py-class docutils literal notranslate"><span class="pre">float</span></code></a>.</p>
</dd></dl>

<dl class="data">
<dt id="types.ComplexType">
<code class="descclassname">types.</code><code class="descname">ComplexType</code><a class="headerlink" href="#types.ComplexType" title="Permalink to this definition">¶</a></dt>
<dd><p>The type of complex numbers (e.g. <code class="docutils literal notranslate"><span class="pre">1.0j</span></code>).  This is not defined if Python was
built without complex number support.</p>
</dd></dl>

<dl class="data">
<dt id="types.StringType">
<code class="descclassname">types.</code><code class="descname">StringType</code><a class="headerlink" href="#types.StringType" title="Permalink to this definition">¶</a></dt>
<dd><p>The type of character strings (e.g. <code class="docutils literal notranslate"><span class="pre">'Spam'</span></code>); alias of the built-in
<a class="reference internal" href="functions.html#str" title="str"><code class="xref py py-class docutils literal notranslate"><span class="pre">str</span></code></a>.</p>
</dd></dl>

<dl class="data">
<dt id="types.UnicodeType">
<code class="descclassname">types.</code><code class="descname">UnicodeType</code><a class="headerlink" href="#types.UnicodeType" title="Permalink to this definition">¶</a></dt>
<dd><p>The type of Unicode character strings (e.g. <code class="docutils literal notranslate"><span class="pre">u'Spam'</span></code>).  This is not defined
if Python was built without Unicode support.  It’s an alias of the built-in
<a class="reference internal" href="functions.html#unicode" title="unicode"><code class="xref py py-class docutils literal notranslate"><span class="pre">unicode</span></code></a>.</p>
</dd></dl>

<dl class="data">
<dt id="types.TupleType">
<code class="descclassname">types.</code><code class="descname">TupleType</code><a class="headerlink" href="#types.TupleType" title="Permalink to this definition">¶</a></dt>
<dd><p>The type of tuples (e.g. <code class="docutils literal notranslate"><span class="pre">(1,</span> <span class="pre">2,</span> <span class="pre">3,</span> <span class="pre">'Spam')</span></code>); alias of the built-in
<a class="reference internal" href="functions.html#tuple" title="tuple"><code class="xref py py-class docutils literal notranslate"><span class="pre">tuple</span></code></a>.</p>
</dd></dl>

<dl class="data">
<dt id="types.ListType">
<code class="descclassname">types.</code><code class="descname">ListType</code><a class="headerlink" href="#types.ListType" title="Permalink to this definition">¶</a></dt>
<dd><p>The type of lists (e.g. <code class="docutils literal notranslate"><span class="pre">[0,</span> <span class="pre">1,</span> <span class="pre">2,</span> <span class="pre">3]</span></code>); alias of the built-in
<code class="xref py py-class docutils literal notranslate"><span class="pre">list</span></code>.</p>
</dd></dl>

<dl class="data">
<dt id="types.DictType">
<code class="descclassname">types.</code><code class="descname">DictType</code><a class="headerlink" href="#types.DictType" title="Permalink to this definition">¶</a></dt>
<dd><p>The type of dictionaries (e.g. <code class="docutils literal notranslate"><span class="pre">{'Bacon':</span> <span class="pre">1,</span> <span class="pre">'Ham':</span> <span class="pre">0}</span></code>); alias of the
built-in <a class="reference internal" href="stdtypes.html#dict" title="dict"><code class="xref py py-class docutils literal notranslate"><span class="pre">dict</span></code></a>.</p>
</dd></dl>

<dl class="data">
<dt id="types.DictionaryType">
<code class="descclassname">types.</code><code class="descname">DictionaryType</code><a class="headerlink" href="#types.DictionaryType" title="Permalink to this definition">¶</a></dt>
<dd><p>An alternate name for <code class="docutils literal notranslate"><span class="pre">DictType</span></code>.</p>
</dd></dl>

<dl class="data">
<dt id="types.FunctionType">
<code class="descclassname">types.</code><code class="descname">FunctionType</code><a class="headerlink" href="#types.FunctionType" title="Permalink to this definition">¶</a></dt>
<dt id="types.LambdaType">
<code class="descclassname">types.</code><code class="descname">LambdaType</code><a class="headerlink" href="#types.LambdaType" title="Permalink to this definition">¶</a></dt>
<dd><p>The type of user-defined functions and functions created by <a class="reference internal" href="../reference/expressions.html#lambda"><code class="xref std std-keyword docutils literal notranslate"><span class="pre">lambda</span></code></a>
expressions.</p>
</dd></dl>

<dl class="data">
<dt id="types.GeneratorType">
<code class="descclassname">types.</code><code class="descname">GeneratorType</code><a class="headerlink" href="#types.GeneratorType" title="Permalink to this definition">¶</a></dt>
<dd><p>The type of <a class="reference internal" href="../glossary.html#term-generator"><span class="xref std std-term">generator</span></a>-iterator objects, produced by calling a
generator function.</p>
<div class="versionadded">
<p><span class="versionmodified">New in version 2.2.</span></p>
</div>
</dd></dl>

<dl class="data">
<dt id="types.CodeType">
<code class="descclassname">types.</code><code class="descname">CodeType</code><a class="headerlink" href="#types.CodeType" title="Permalink to this definition">¶</a></dt>
<dd><p id="index-1">The type for code objects such as returned by <a class="reference internal" href="functions.html#compile" title="compile"><code class="xref py py-func docutils literal notranslate"><span class="pre">compile()</span></code></a>.</p>
</dd></dl>

<dl class="data">
<dt id="types.ClassType">
<code class="descclassname">types.</code><code class="descname">ClassType</code><a class="headerlink" href="#types.ClassType" title="Permalink to this definition">¶</a></dt>
<dd><p>The type of user-defined old-style classes.</p>
</dd></dl>

<dl class="data">
<dt id="types.InstanceType">
<code class="descclassname">types.</code><code class="descname">InstanceType</code><a class="headerlink" href="#types.InstanceType" title="Permalink to this definition">¶</a></dt>
<dd><p>The type of instances of user-defined old-style classes.</p>
</dd></dl>

<dl class="data">
<dt id="types.MethodType">
<code class="descclassname">types.</code><code class="descname">MethodType</code><a class="headerlink" href="#types.MethodType" title="Permalink to this definition">¶</a></dt>
<dd><p>The type of methods of user-defined class instances.</p>
</dd></dl>

<dl class="data">
<dt id="types.UnboundMethodType">
<code class="descclassname">types.</code><code class="descname">UnboundMethodType</code><a class="headerlink" href="#types.UnboundMethodType" title="Permalink to this definition">¶</a></dt>
<dd><p>An alternate name for <code class="docutils literal notranslate"><span class="pre">MethodType</span></code>.</p>
</dd></dl>

<dl class="data">
<dt id="types.BuiltinFunctionType">
<code class="descclassname">types.</code><code class="descname">BuiltinFunctionType</code><a class="headerlink" href="#types.BuiltinFunctionType" title="Permalink to this definition">¶</a></dt>
<dt id="types.BuiltinMethodType">
<code class="descclassname">types.</code><code class="descname">BuiltinMethodType</code><a class="headerlink" href="#types.BuiltinMethodType" title="Permalink to this definition">¶</a></dt>
<dd><p>The type of built-in functions like <a class="reference internal" href="functions.html#len" title="len"><code class="xref py py-func docutils literal notranslate"><span class="pre">len()</span></code></a> or <a class="reference internal" href="sys.html#sys.exit" title="sys.exit"><code class="xref py py-func docutils literal notranslate"><span class="pre">sys.exit()</span></code></a>, and
methods of built-in classes.  (Here, the term “built-in” means “written in
C”.)</p>
</dd></dl>

<dl class="data">
<dt id="types.ModuleType">
<code class="descclassname">types.</code><code class="descname">ModuleType</code><a class="headerlink" href="#types.ModuleType" title="Permalink to this definition">¶</a></dt>
<dd><p>The type of modules.</p>
</dd></dl>

<dl class="data">
<dt id="types.FileType">
<code class="descclassname">types.</code><code class="descname">FileType</code><a class="headerlink" href="#types.FileType" title="Permalink to this definition">¶</a></dt>
<dd><p>The type of open file objects such as <code class="docutils literal notranslate"><span class="pre">sys.stdout</span></code>; alias of the built-in
<a class="reference internal" href="functions.html#file" title="file"><code class="xref py py-class docutils literal notranslate"><span class="pre">file</span></code></a>.</p>
</dd></dl>

<dl class="data">
<dt id="types.XRangeType">
<code class="descclassname">types.</code><code class="descname">XRangeType</code><a class="headerlink" href="#types.XRangeType" title="Permalink to this definition">¶</a></dt>
<dd><p id="index-2">The type of range objects returned by <a class="reference internal" href="functions.html#xrange" title="xrange"><code class="xref py py-func docutils literal notranslate"><span class="pre">xrange()</span></code></a>; alias of the built-in
<a class="reference internal" href="functions.html#xrange" title="xrange"><code class="xref py py-class docutils literal notranslate"><span class="pre">xrange</span></code></a>.</p>
</dd></dl>

<dl class="data">
<dt id="types.SliceType">
<code class="descclassname">types.</code><code class="descname">SliceType</code><a class="headerlink" href="#types.SliceType" title="Permalink to this definition">¶</a></dt>
<dd><p id="index-3">The type of objects returned by <a class="reference internal" href="functions.html#slice" title="slice"><code class="xref py py-func docutils literal notranslate"><span class="pre">slice()</span></code></a>; alias of the built-in
<a class="reference internal" href="functions.html#slice" title="slice"><code class="xref py py-class docutils literal notranslate"><span class="pre">slice</span></code></a>.</p>
</dd></dl>

<dl class="data">
<dt id="types.EllipsisType">
<code class="descclassname">types.</code><code class="descname">EllipsisType</code><a class="headerlink" href="#types.EllipsisType" title="Permalink to this definition">¶</a></dt>
<dd><p>The type of <code class="docutils literal notranslate"><span class="pre">Ellipsis</span></code>.</p>
</dd></dl>

<dl class="data">
<dt id="types.TracebackType">
<code class="descclassname">types.</code><code class="descname">TracebackType</code><a class="headerlink" href="#types.TracebackType" title="Permalink to this definition">¶</a></dt>
<dd><p>The type of traceback objects such as found in <code class="docutils literal notranslate"><span class="pre">sys.exc_traceback</span></code>.</p>
</dd></dl>

<dl class="data">
<dt id="types.FrameType">
<code class="descclassname">types.</code><code class="descname">FrameType</code><a class="headerlink" href="#types.FrameType" title="Permalink to this definition">¶</a></dt>
<dd><p>The type of frame objects such as found in <code class="docutils literal notranslate"><span class="pre">tb.tb_frame</span></code> if <code class="docutils literal notranslate"><span class="pre">tb</span></code> is a
traceback object.</p>
</dd></dl>

<dl class="data">
<dt id="types.BufferType">
<code class="descclassname">types.</code><code class="descname">BufferType</code><a class="headerlink" href="#types.BufferType" title="Permalink to this definition">¶</a></dt>
<dd><p id="index-4">The type of buffer objects created by the <a class="reference internal" href="functions.html#buffer" title="buffer"><code class="xref py py-func docutils literal notranslate"><span class="pre">buffer()</span></code></a> function.</p>
</dd></dl>

<dl class="data">
<dt id="types.DictProxyType">
<code class="descclassname">types.</code><code class="descname">DictProxyType</code><a class="headerlink" href="#types.DictProxyType" title="Permalink to this definition">¶</a></dt>
<dd><p>The type of dict proxies, such as <code class="docutils literal notranslate"><span class="pre">TypeType.__dict__</span></code>.</p>
</dd></dl>

<dl class="data">
<dt id="types.NotImplementedType">
<code class="descclassname">types.</code><code class="descname">NotImplementedType</code><a class="headerlink" href="#types.NotImplementedType" title="Permalink to this definition">¶</a></dt>
<dd><p>The type of <code class="docutils literal notranslate"><span class="pre">NotImplemented</span></code></p>
</dd></dl>

<dl class="data">
<dt id="types.GetSetDescriptorType">
<code class="descclassname">types.</code><code class="descname">GetSetDescriptorType</code><a class="headerlink" href="#types.GetSetDescriptorType" title="Permalink to this definition">¶</a></dt>
<dd><p>The type of objects defined in extension modules with <code class="docutils literal notranslate"><span class="pre">PyGetSetDef</span></code>, such
as <code class="docutils literal notranslate"><span class="pre">FrameType.f_locals</span></code> or <code class="docutils literal notranslate"><span class="pre">array.array.typecode</span></code>.  This type is used as
descriptor for object attributes; it has the same purpose as the
<a class="reference internal" href="functions.html#property" title="property"><code class="xref py py-class docutils literal notranslate"><span class="pre">property</span></code></a> type, but for classes defined in extension modules.</p>
<div class="versionadded">
<p><span class="versionmodified">New in version 2.5.</span></p>
</div>
</dd></dl>

<dl class="data">
<dt id="types.MemberDescriptorType">
<code class="descclassname">types.</code><code class="descname">MemberDescriptorType</code><a class="headerlink" href="#types.MemberDescriptorType" title="Permalink to this definition">¶</a></dt>
<dd><p>The type of objects defined in extension modules with <code class="docutils literal notranslate"><span class="pre">PyMemberDef</span></code>, such
as <code class="docutils literal notranslate"><span class="pre">datetime.timedelta.days</span></code>.  This type is used as descriptor for simple C
data members which use standard conversion functions; it has the same purpose
as the <a class="reference internal" href="functions.html#property" title="property"><code class="xref py py-class docutils literal notranslate"><span class="pre">property</span></code></a> type, but for classes defined in extension modules.</p>
<div class="impl-detail compound">
<p><strong>CPython implementation detail:</strong> In other implementations of Python, this type may be identical to
<code class="docutils literal notranslate"><span class="pre">GetSetDescriptorType</span></code>.</p>
</div>
<div class="versionadded">
<p><span class="versionmodified">New in version 2.5.</span></p>
</div>
</dd></dl>

<dl class="data">
<dt id="types.StringTypes">
<code class="descclassname">types.</code><code class="descname">StringTypes</code><a class="headerlink" href="#types.StringTypes" title="Permalink to this definition">¶</a></dt>
<dd><p>A sequence containing <code class="docutils literal notranslate"><span class="pre">StringType</span></code> and <code class="docutils literal notranslate"><span class="pre">UnicodeType</span></code> used to facilitate
easier checking for any string object.  Using this is more portable than using a
sequence of the two string types constructed elsewhere since it only contains
<code class="docutils literal notranslate"><span class="pre">UnicodeType</span></code> if it has been built in the running version of Python.  For
example: <code class="docutils literal notranslate"><span class="pre">isinstance(s,</span> <span class="pre">types.StringTypes)</span></code>.</p>
<div class="versionadded">
<p><span class="versionmodified">New in version 2.2.</span></p>
</div>
</dd></dl>

</div>


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