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<title>7.2.1 Plain Integer Objects </title>
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<H2><A NAME="SECTION009210000000000000000"></A><A NAME="intObjects"></A>
<BR>
7.2.1 Plain Integer Objects
</H2>

<P>
<a id='l2h-369' xml:id='l2h-369'></a><dl><dt><b><tt class="ctype"><a id='l2h-370' xml:id='l2h-370'>PyIntObject</a></tt></b></dt>
<dd>
  This subtype of <tt class="ctype">PyObject</tt> represents a Python integer
  object.
</dl>

<P>
<dl><dt>PyTypeObject <b><tt id='l2h-371' xml:id='l2h-371' class="cdata">PyInt_Type</tt></b></dt>
<dd>
  This instance of <tt class="ctype">PyTypeObject</tt> represents the Python plain
  integer type.  This is the same object as <code>types.IntType</code>.
  <a id='l2h-373' xml:id='l2h-373'></a></dd></dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int&nbsp;<b><tt id='l2h-374' xml:id='l2h-374' class="cfunction">PyInt_Check</tt></b>(</nobr></td><td>PyObject *<var>o</var>)</td></tr></table></dt>
<dd>
  Return true if <var>o</var> is of type <tt class="cdata">PyInt_Type</tt> or a subtype
  of <tt class="cdata">PyInt_Type</tt>.

<span class="versionnote">Changed in version 2.2:
Allowed subtypes to be accepted.</span>

</dd></dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>int&nbsp;<b><tt id='l2h-375' xml:id='l2h-375' class="cfunction">PyInt_CheckExact</tt></b>(</nobr></td><td>PyObject *<var>o</var>)</td></tr></table></dt>
<dd>
  Return true if <var>o</var> is of type <tt class="cdata">PyInt_Type</tt>, but not a
  subtype of <tt class="cdata">PyInt_Type</tt>.

<span class="versionnote">New in version 2.2.</span>

</dd></dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>PyObject*&nbsp;<b><tt id='l2h-376' xml:id='l2h-376' class="cfunction">PyInt_FromString</tt></b>(</nobr></td><td>char *<var>str</var>, char **<var>pend</var>,
                                               int <var>base</var>)</td></tr></table></dt>
<dd>
  Return a new <tt class="ctype">PyIntObject</tt> or <tt class="ctype">PyLongObject</tt> based on the
  string value in <var>str</var>, which is interpreted according to the radix in
  <var>base</var>.  If <var>pend</var> is non-<tt class="constant">NULL</tt>, <code>*<var>pend</var></code> will point to
  the first character in <var>str</var> which follows the representation of the
  number.  If <var>base</var> is <code>0</code>, the radix will be determined based on
  the leading characters of <var>str</var>: if <var>str</var> starts with <code>'0x'</code>
  or <code>'0X'</code>, radix 16 will be used; if <var>str</var> starts with
  <code>'0'</code>, radix 8 will be used; otherwise radix 10 will be used.  If
  <var>base</var> is not <code>0</code>, it must be between <code>2</code> and <code>36</code>,
  inclusive.  Leading spaces are ignored.  If there are no digits,
  <tt class="exception">ValueError</tt> will be raised.  If the string represents a number
  too large to be contained within the machine's <tt class="ctype">long int</tt> type and
  overflow warnings are being suppressed, a <tt class="ctype">PyLongObject</tt> will be
  returned.  If overflow warnings are not being suppressed, <tt class="constant">NULL</tt> will be
  returned in this case.
</dd></dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>PyObject*&nbsp;<b><tt id='l2h-377' xml:id='l2h-377' class="cfunction">PyInt_FromLong</tt></b>(</nobr></td><td>long <var>ival</var>)</td></tr></table></dt>
<dd>
<div class="refcount-info">
  <span class="label">Return value:</span>
  <span class="value">New reference.</span>
</div>
  Create a new integer object with a value of <var>ival</var>.

<P>
The current implementation keeps an array of integer objects for all
  integers between <code>-1</code> and <code>100</code>, when you create an int in
  that range you actually just get back a reference to the existing
  object. So it should be possible to change the value of <code>1</code>.  I
  suspect the behaviour of Python in this case is undefined. :-)
</dd></dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>long&nbsp;<b><tt id='l2h-378' xml:id='l2h-378' class="cfunction">PyInt_AsLong</tt></b>(</nobr></td><td>PyObject *<var>io</var>)</td></tr></table></dt>
<dd>
  Will first attempt to cast the object to a <tt class="ctype">PyIntObject</tt>, if
  it is not already one, and then return its value.
</dd></dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>long&nbsp;<b><tt id='l2h-379' xml:id='l2h-379' class="cfunction">PyInt_AS_LONG</tt></b>(</nobr></td><td>PyObject *<var>io</var>)</td></tr></table></dt>
<dd>
  Return the value of the object <var>io</var>.  No error checking is
  performed.
</dd></dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>unsigned long&nbsp;<b><tt id='l2h-380' xml:id='l2h-380' class="cfunction">PyInt_AsUnsignedLongMask</tt></b>(</nobr></td><td>PyObject *<var>io</var>)</td></tr></table></dt>
<dd>
  Will first attempt to cast the object to a <tt class="ctype">PyIntObject</tt> or
  <tt class="ctype">PyLongObject</tt>, if it is not already one, and then return its
  value as unsigned long.  This function does not check for overflow.

<span class="versionnote">New in version 2.3.</span>

</dd></dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>unsigned long long&nbsp;<b><tt id='l2h-381' xml:id='l2h-381' class="cfunction">PyInt_AsUnsignedLongLongMask</tt></b>(</nobr></td><td>PyObject *<var>io</var>)</td></tr></table></dt>
<dd>
  Will first attempt to cast the object to a <tt class="ctype">PyIntObject</tt> or
  <tt class="ctype">PyLongObject</tt>, if it is not already one, and then return its
  value as unsigned long long, without checking for overflow.

<span class="versionnote">New in version 2.3.</span>

</dd></dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>long&nbsp;<b><tt id='l2h-382' xml:id='l2h-382' class="cfunction">PyInt_GetMax</tt></b>(</nobr></td><td>)</td></tr></table></dt>
<dd>
  Return the system's idea of the largest integer it can handle
  (<tt class="constant">LONG_MAX</tt><a id='l2h-383' xml:id='l2h-383'></a>, as defined in the system
  header files).
</dd></dl>

<P>

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<span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span>
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