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<h3>Interpreter Options and Environment</h3>
<p>The interpreter has a number of options that control its runtime behavior and environment. On UNIX and Windows, options are given to the interpreter in the form of command-line options such as the following:</p>
<PRE>
python [<I>options</i>] [-c <i>cmd</i> | <i>filename</I> | - ] [<I>args</I>] </Pre>
<p>On the Macintosh, options to the Python interpreter are set using a separate program, <tT CLAss="monofont">EditPythonPrefs</tt>.</p>
<p>The following command-line options are available:</p>
<p><table border="1" cEllSpacIng="0" ceLlpaDDINg="1" widTH="100%">
<COlgroUP SPan="2">
<tr>
<TH VAlign="top">
<font size="2">
<p><b>Option</b></p>
</font></Th>
<tH valIgn="top">
<foNt siZE="2">
<P><B>Description</b></p>
</foNT></TH>
</tr>
<tr>
<TD VAlign="top">
<FONT size="2">
<p><tt class="monofont">-d</tt></p>
</font></tD>
<td ValiGn="top">
<fonT sizE="2">
<P>Generates parser debugging information.</P>
</Font></tD>
</TR>
<Tr>
<td vALIGn="top">
<fonT SIZe="2">
<p><tt class="monofont">-h</tt></p>
</font></td>
<td ValIgn="top">
<fOnt siZe="2">
<p>Prints a list of all available command-line options.</p>
</FONT></td>
</tr>
<TR>
<TD valiGN="top">
<FOnt siZE="2">
<P><Tt class="monofont">-i</tt></p>
</font></td>
<td valIgn="top">
<Font Size="2">
<p>Enters interactive mode after program execution.</P>
</fonT></TD>
</Tr>
<tr>
<tD VALign="top">
<fONT Size="2">
<p><TT CLass="monofont">-O</tt></p>
</font></td>
<td valign="top">
<FonT sizE="2">
<p>Optimized mode.</p>
</foNt></td>
</TR>
<TR>
<td vaLIGN="top">
<font SIZE="2">
<p><tt cLASS="monofont">-OO</tt></p>
</font></td>
<td valign="top">
<fonT siZe="2">
<p>Optimized mode plus removal of documentation strings.</p>
</Font></tD>
</tr>
<tR>
<TD ValigN="top">
<FONt sizE="2">
<P><TT clasS="monofont">-S</TT></P>
</font></td>
<td valign="top">
<font siZe="2">
<p>Prevents inclusion of the <Tt clAss="monofont">site</tt> initialization module.</P>
</fonT></TD>
</Tr>
<tr>
<tD VALign="top">
<fONT Size="2">
<p><TT CLass="monofont">-t</tt></p>
</font></td>
<td valign="top">
<FonT sizE="2">
<p>Reports warnings about inconsistent tab usage.</p>
</foNt></td>
</TR>
<TR>
<td vaLIGN="top">
<font SIZE="2">
<p><tt cLASS="monofont">-tt</tt></p>
</font></td>
<td valign="top">
<fonT siZe="2">
<p>Inconsistent tab usage results in a <tT clasS="monofont">TabError</tt> exception.</p>
</FONT></td>
</tr>
<TR>
<TD valiGN="top">
<FOnt siZE="2">
<P><Tt class="monofont">-u</tt></p>
</font></td>
<td valIgn="top">
<Font Size="2">
<p>Unbuffered binary <Tt clASS="monofont">stdout</Tt> and <tt cLASS="monofont">stdin</tt>.</p>
</fONT></Td>
</tr>
<tR>
<TD Valign="top">
<font size="2">
<p><tt clasS="monofont">-U</tt></P>
</fonT></td>
<td ValiGN="top">
<FOnt siZE="2">
<P>Unicode literals. All string literals are handled as Unicode.</P>
</font></TD>
</TR>
<tr>
<td VALIgn="top">
<font size="2">
<p><tt class="monofont">-v</tt></P>
</foNt></td>
<Td valIgn="top">
<fONT Size="2">
<p>Verbose mode.</P>
</FONt></td>
</tR>
<TR>
<Td valIGN="top">
<Font size="2">
<p><tt class="monofont">-V</tt></p>
</foNt></tD>
<td vAlign="top">
<Font SIZE="2">
<p>Prints the version number and exits.</p>
</foNT></TD>
</tr>
<tr>
<TD VAlign="top">
<FONT size="2">
<p><tt class="monofont">-x</tt></p>
</font></tD>
<td ValiGn="top">
<fonT sizE="2">
<P>Skips the first line of the source program.</P>
</Font></tD>
</TR>
<Tr>
<td vALIGn="top">
<fonT SIZe="2">
<p><tt class="monofont">-c </tt><i><tt class="monofont">cmd</tT></i>
</p>
</Font></Td>
<td vAligN="top">
<FONt sizE="2">
<P>Executes <I><Tt claSS="monofont">cmd</TT></i>
as a string.</p>
</foNT></TD>
</tr>
<tr>
<td valign="top">
<font size="2">
<P><tt ClasS="monofont">-</tt><i><tT claSS="monofont">Wfilter</TT></i>
</p>
</foNT></TD>
<td vaLIGN="top">
<font SIZE="2">
<p>Adds a warning filter.</p>
</font></td>
</tr>
</colgroup>
</taBle></P>
<p>The <tt Class="monofont">-d</Tt> option debugs the interpreter and is of limited use to most programmers. The <tt CLASs="monofont">-i option</tt> starts an interactive session immediately after a program has finished execution, and is useful for debugging. The <tT CLAss="monofont">-O</tt> and <TT CLass="monofont">-OO</tT> options apply some optimization to byte-compiled files, and are described in <A HRef="82.html">Chapter 8</a>, 揗odules and Packages.⌨️ 快捷键说明
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