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17.1.4 Exceptions and Error Handling
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<P>
The parser module defines a single exception, but may also pass other
built-in exceptions from other portions of the Python runtime
environment. See each function for information about the exceptions
it can raise.
<P>
<dl><dt><b><a name='l2h-3023'><tt class='exception'>ParserError</tt></a></b>
<dd>
Exception raised when a failure occurs within the parser module. This
is generally produced for validation failures rather than the built in
<tt class="exception">SyntaxError</tt> thrown during normal parsing.
The exception argument is either a string describing the reason of the
failure or a tuple containing a sequence causing the failure from a parse
tree passed to <tt class="function">sequence2ast()</tt> and an explanatory string. Calls to
<tt class="function">sequence2ast()</tt> need to be able to handle either type of exception,
while calls to other functions in the module will only need to be
aware of the simple string values.
</dl>
<P>
Note that the functions <tt class="function">compileast()</tt>, <tt class="function">expr()</tt>, and
<tt class="function">suite()</tt> may throw exceptions which are normally thrown by the
parsing and compilation process. These include the built in
exceptions <tt class="exception">MemoryError</tt>, <tt class="exception">OverflowError</tt>,
<tt class="exception">SyntaxError</tt>, and <tt class="exception">SystemError</tt>. In these cases, these
exceptions carry all the meaning normally associated with them. Refer
to the descriptions of each function for detailed information.
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