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<H2><A NAME="SECTION000510000000000000000">&nbsp;</A>
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4.1 Exceptions 
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<P>
We realized early that most of the exceptions would be raised by the I/O
functions of OpenSSL, so it felt natural to mimic OpenSSL's error code system,
translating them into Python exceptions. This naturally gives us the exceptions
<tt class="exception">SSL.ZeroReturnError</tt>, <tt class="exception">SSL.WantReadError</tt>,
<tt class="exception">SSL.WantWriteError</tt>, <tt class="exception">SSL.WantX509LookupError</tt> and
<tt class="exception">SSL.SysCallError</tt>.

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For more information about this, see section <A href="openssl-ssl.html#openssl-ssl">3.3</A>.

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