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<H1><A NAME="SECTION00101000000000000000000">
10.10 <tt class="module">distutils.dep_util</tt> -- Dependency checking</A>
</H1>
<A NAME="module-distutils.deputil"></A>

<P>
This module provides functions for performing simple, timestamp-based
dependency of files and groups of files; also, functions based entirely
on such timestamp dependency analysis.

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-66' xml:id='l2h-66' class="function">newer</tt></b>(</nobr></td>
  <td><var>source, target</var>)</td></tr></table></dt>
<dd>
Return true if <var>source</var> exists and is more recently modified than
<var>target</var>, or if <var>source</var> exists and <var>target</var> doesn't.
Return false if both exist and <var>target</var> is the same age or newer
than <var>source</var>.
Raise <tt class="exception">DistutilsFileError</tt> if <var>source</var> does not exist.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-67' xml:id='l2h-67' class="function">newer_pairwise</tt></b>(</nobr></td>
  <td><var>sources, targets</var>)</td></tr></table></dt>
<dd>
Walk two filename lists in parallel, testing if each source is newer
than its corresponding target.  Return a pair of lists (<var>sources</var>,
<var>targets</var>) where source is newer than target, according to the semantics
of <tt class="function">newer()</tt>
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-68' xml:id='l2h-68' class="function">newer_group</tt></b>(</nobr></td>
  <td><var>sources, target</var><big>[</big><var>, missing=<code>'error'</code></var><big>]</big><var></var>)</td></tr></table></dt>
<dd>
Return true if <var>target</var> is out-of-date with respect to any file
listed in <var>sources</var>  In other words, if <var>target</var> exists and is newer
than every file in <var>sources</var>, return false; otherwise return true.
<var>missing</var> controls what we do when a source file is missing; the
default (<code>'error'</code>) is to blow up with an <tt class="exception">OSError</tt> from
inside <tt class="function">os.stat()</tt>;
if it is <code>'ignore'</code>, we silently drop any missing source files; if it is
<code>'newer'</code>, any missing source files make us assume that <var>target</var> is
out-of-date (this is handy in ``dry-run'' mode: it'll make you pretend to
carry out commands that wouldn't work because inputs are missing, but
that doesn't matter because you're not actually going to run the
commands).
</dl>

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