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copied!<p>How about using Python's <code>distutils.version.StrictVersion</code>?</p> <pre><code>>>> from distutils.version import StrictVersion >>> StrictVersion('10.4.10') > StrictVersion('10.4.9') True </code></pre> <p>So for your <code>cmp</code> function:</p> <pre><code>>>> cmp = lambda x, y: StrictVersion(x).__cmp__(y) >>> cmp("10.4.10", "10.4.11") -1 </code></pre> <p>If you want to compare version numbers that are more complex <code>distutils.version.LooseVersion</code> will be more useful, however be sure to only compare the same types.</p> <pre><code>>>> from distutils.version import LooseVersion, StrictVersion >>> LooseVersion('1.4c3') > LooseVersion('1.3') True >>> LooseVersion('1.4c3') > StrictVersion('1.3') # different types False </code></pre> <p><code>LooseVersion</code> isn't the most intelligent tool, and can easily be tricked:</p> <pre><code>>>> LooseVersion('1.4') > LooseVersion('1.4-rc1') False </code></pre> <p>To have success with this breed, you'll need to step outside the standard library and use <a href="http://packages.python.org/distribute/">distribute</a>'s parsing utility <a href="http://packages.python.org/distribute/pkg_resources.html#parsing-utilities"><code>parse_version</code></a>.</p> <pre><code>>>> from pkg_resources import parse_version >>> parse_version('1.4') > parse_version('1.4-rc2') True </code></pre> <p>So depending on your specific use-case, you'll need to decide whether the builtin <code>distutils</code> tools are enough, or if it's warranted to add as a dependency <code>distribute</code>.</p>

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