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<H1><A NAME="SECTION0001500000000000000000">
14 Porting to Python 2.4</A>
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<P>
This section lists previously described changes that may require
changes to your code:

<P>

<UL>
<LI>Left shifts and hexadecimal/octal constants that are too
  large no longer trigger a <tt class="exception">FutureWarning</tt> and return
  a value limited to 32 or 64 bits; instead they return a long integer.

<P>
</LI>
<LI>Integer operations will no longer trigger an <tt class="exception">OverflowWarning</tt>.
The <tt class="exception">OverflowWarning</tt> warning will disappear in Python 2.5.

<P>
</LI>
<LI>The <tt class="function">zip()</tt> built-in function and <tt class="function">itertools.izip()</tt>
  now return  an empty list instead of raising a <tt class="exception">TypeError</tt>
  exception if called with no arguments.

<P>
</LI>
<LI><tt class="function">dircache.listdir()</tt> now passes exceptions to the caller
      instead of returning empty lists.

<P>
</LI>
<LI><tt class="function">LexicalHandler.startDTD()</tt> used to receive the public and
  system IDs in the wrong order.  This has been corrected; applications
  relying on the wrong order need to be fixed.

<P>
</LI>
<LI><tt class="function">fcntl.ioctl</tt> now warns if the <var>mutate</var>
 argument is omitted and relevant.

<P>
</LI>
<LI>The <tt class="module">tarfile</tt> module now generates GNU-format tar files
by default.

<P>
</LI>
<LI>Encountering a failure while importing a module no longer leaves
a partially-initialized module object in <code>sys.modules</code>.

<P>
</LI>
<LI><tt class="constant">None</tt> is now a constant; code that binds a new value to
the name "<tt class="samp">None</tt>" is now a syntax error.

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</LI>
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