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<H1><A NAME="SECTION000300000000000000000">
2 PEP 237: Unifying Long Integers and Integers</A>
</H1>

<P>
The lengthy transition process for this PEP, begun in Python 2.2,
takes another step forward in Python 2.4.  In 2.3, certain integer
operations that would behave differently after int/long unification
triggered <tt class="exception">FutureWarning</tt> warnings and returned values
limited to 32 or 64 bits (depending on your platform).  In 2.4, these
expressions no longer produce a warning and instead produce a
different result that's usually a long integer.

<P>
The problematic expressions are primarily left shifts and lengthy
hexadecimal and octal constants.  For example,
<code>2 &lt;&lt; 32</code> results
in a warning in 2.3, evaluating to 0 on 32-bit platforms.  In Python
2.4, this expression now returns the correct answer, 8589934592.

<P>
<div class="seealso">
  <p class="heading">See Also:</p>

<dl compact="compact" class="seerfc">
    <dt><a href="http://www.python.org/peps/pep-0237.html"
        title="Unifying Long Integers and Integers"
        >PEP 237, <em>Unifying Long Integers and Integers</em></a>
    <dd>Original PEP
written by Moshe Zadka and GvR.  The changes for 2.4 were implemented by
Kalle Svensson.
  </dl>
</div>

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