系统模块 sys

<!DOCTYPE html>

<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    
    <title>系统模块sys.md—/Volumes/DATA/File/Work/tedu/weimz/python/教学笔记/html/python_base_docs</title>
    <style type="text/css">
    html{font-family: sans-serif;-ms-text-size-adjust: 100%;-webkit-text-size-adjust: 100%}body{margin: 0}article,aside,details,figcaption,figure,footer,header,hgroup,main,nav,section,summary{display: block}audio,canvas,progress,video{display: inline-block;vertical-align: baseline}audio:not([controls]){display: none;height: 0}[hidden],template{display: none}a{background: transparent}a:active,a:hover{outline: 0}abbr[title]{border-bottom: 1px dotted}b,strong{font-weight: bold}dfn{font-style: italic}h1{font-size: 2em;margin: 0.67em 0}mark{background: #ff0;color: #000}small{font-size: 80%}sub,sup{font-size: 75%;line-height: 0;position: relative;vertical-align: baseline}sup{top: -0.5em}sub{bottom: -0.25em}img{border: 0}svg:not(:root){overflow: hidden}figure{margin: 1em 40px}hr{box-sizing: content-box;height: 0}pre{overflow: auto}code,kbd,pre,samp{font-family: monospace, monospace;font-size: 1em}button,input,optgroup,select,textarea{color: inherit;font: inherit;margin: 0}button{overflow: visible}button,select{text-transform: none}button,html input[type="button"],input[type="reset"],input[type="submit"]{-webkit-appearance: button;cursor: pointer}button[disabled],html input[disabled]{cursor: default}button::-moz-focus-inner,input::-moz-focus-inner{border: 0;padding: 0}input{line-height: normal}input[type="checkbox"],input[type="radio"]{box-sizing: border-box;padding: 0}input[type="number"]::-webkit-inner-spin-button,input[type="number"]::-webkit-outer-spin-button{height: auto}input[type="search"]{-webkit-appearance: textfield;box-sizing: content-box}input[type="search"]::-webkit-search-cancel-button,input[type="search"]::-webkit-search-decoration{-webkit-appearance: none}fieldset{border: 1px solid #c0c0c0;margin: 0 2px;padding: 0.35em 0.625em 0.75em}legend{border: 0;padding: 0}textarea{overflow: auto}optgroup{font-weight: bold}table{border-collapse: collapse;border-spacing: 0}td,th{padding: 0}*{box-sizing: border-box}input,select,textarea,button{font: 13px/1.4 Helvetica, arial, freesans, clean, sans-serif, "Segoe UI Emoji", "Segoe UI Symbol"}body{min-width: 1020px;font: 13px/1.4 Helvetica, arial, freesans, clean, sans-serif, "Segoe UI Emoji", "Segoe UI Symbol";color: #333;background-color: #fff}a{color: #4183c4;text-decoration: none}a:hover,a:active{text-decoration: underline}hr,.rule{height: 0;margin: 15px 0;overflow: hidden;background: transparent;border: 0;border-bottom: 1px solid #ddd}hr:before,.rule:before{display: table;content: ""}hr:after,.rule:after{display: table;clear: both;content: ""}h1,h2,h3,h4,h5,h6{margin-top: 15px;margin-bottom: 15px;line-height: 1.1}h1{font-size: 30px}h2{font-size: 21px}h3{font-size: 16px}h4{font-size: 14px}h5{font-size: 12px}h6{font-size: 11px}small{font-size: 90%}blockquote{margin: 0}.lead{margin-bottom: 30px;font-size: 20px;font-weight: 300;color: #555}.text-muted{color: #999}.text-danger{color: #bd2c00}.text-emphasized{font-weight: bold;color: #333}ul,ol{padding: 0;margin-top: 0;margin-bottom: 0}ol ol,ul ol{list-style-type: lower-roman}ul ul ol,ul ol ol,ol ul ol,ol ol ol{list-style-type: lower-alpha}dd{margin-left: 0}tt,code{font-family: Consolas, "Liberation Mono", Menlo, Courier, monospace;font-size: 12px}pre{margin-top: 0;margin-bottom: 0;font: 12px Consolas, "Liberation Mono", Menlo, Courier, monospace}#realtime .status{overflow: visible;position: absolute;top: -5px;left: 0;background: url("/public/images/github-status.png");width: 26px;height: 26px;display: block;margin: 0 5px 0 0}#realtime .up{background-position: 0 0}#realtime .problem{background-position: 0 -53px}#realtime .down{background-position: 0 -26px}.container{max-width: 920px;margin: 0 auto 20px auto}#header{background: #FAFAFA;background: -moz-linear-gradient(#FAFAFA, #EAEAEA);background: -webkit-linear-gradient(#FAFAFA, #EAEAEA);-ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorstr='#fafafa', endColorstr='#eaeaea')";border-bottom: 1px solid #CACACA;box-shadow: 0 1px 0 rgba(255, 255, 255, 0.4),0 0 10px rgba(0, 0, 0, 0.1)}#markup{padding: 3px}#markup article{padding-top: 30px}.markdown-body{overflow: hidden;font-family: "Helvetica Neue", Helvetica, "Segoe UI", Arial, freesans, sans-serif;font-size: 16px;line-height: 1.6;word-wrap: break-word}.markdown-body>*:first-child{margin-top: 0 !important}.markdown-body>*:last-child{margin-bottom: 0 !important}.markdown-body .absent{color: #c00}.markdown-body .anchor{position: absolute;top: 0;left: 0;display: block;padding-right: 6px;padding-left: 30px;margin-left: -30px}.markdown-body .anchor:focus{outline: none}.markdown-body h1,.markdown-body h2,.markdown-body h3,.markdown-body h4,.markdown-body h5,.markdown-body h6{position: relative;margin-top: 1em;margin-bottom: 16px;font-weight: bold;line-height: 1.4}.markdown-body h1 .octicon-link,.markdown-body h2 .octicon-link,.markdown-body h3 .octicon-link,.markdown-body h4 .octicon-link,.markdown-body h5 .octicon-link,.markdown-body h6 .octicon-link{display: none;color: #000;vertical-align: middle}.markdown-body h1:hover .anchor,.markdown-body h2:hover .anchor,.markdown-body h3:hover .anchor,.markdown-body h4:hover .anchor,.markdown-body h5:hover .anchor,.markdown-body h6:hover .anchor{padding-left: 8px;margin-left: -30px;text-decoration: none}.markdown-body h1:hover .anchor .octicon-link,.markdown-body h2:hover .anchor .octicon-link,.markdown-body h3:hover .anchor .octicon-link,.markdown-body h4:hover .anchor .octicon-link,.markdown-body h5:hover .anchor .octicon-link,.markdown-body h6:hover .anchor .octicon-link{display: inline-block}.markdown-body h1 tt,.markdown-body h1 code,.markdown-body h2 tt,.markdown-body h2 code,.markdown-body h3 tt,.markdown-body h3 code,.markdown-body h4 tt,.markdown-body h4 code,.markdown-body h5 tt,.markdown-body h5 code,.markdown-body h6 tt,.markdown-body h6 code{font-size: inherit}.markdown-body h1{padding-bottom: 0.3em;font-size: 2.25em;line-height: 1.2;border-bottom: 1px solid #eee}.markdown-body h1 .anchor{line-height: 1}.markdown-body h2{padding-bottom: 0.3em;font-size: 1.75em;line-height: 1.225;border-bottom: 1px solid #eee}.markdown-body h2 .anchor{line-height: 1}.markdown-body h3{font-size: 1.5em;line-height: 1.43}.markdown-body h3 .anchor{line-height: 1.2}.markdown-body h4{font-size: 1.25em}.markdown-body h4 .anchor{line-height: 1.2}.markdown-body h5{font-size: 1em}.markdown-body h5 .anchor{line-height: 1.1}.markdown-body h6{font-size: 1em;color: #777}.markdown-body h6 .anchor{line-height: 1.1}.markdown-body p,.markdown-body blockquote,.markdown-body ul,.markdown-body ol,.markdown-body dl,.markdown-body table,.markdown-body pre{margin-top: 0;margin-bottom: 16px}.markdown-body hr{height: 4px;padding: 0;margin: 16px 0;background-color: #e7e7e7;border: 0 none}.markdown-body ul,.markdown-body ol{padding-left: 2em}.markdown-body ul.no-list,.markdown-body ol.no-list{padding: 0;list-style-type: none}.markdown-body ul ul,.markdown-body ul ol,.markdown-body ol ol,.markdown-body ol ul{margin-top: 0;margin-bottom: 0}.markdown-body li>p{margin-top: 16px}.markdown-body dl{padding: 0}.markdown-body dl dt{padding: 0;margin-top: 16px;font-size: 1em;font-style: italic;font-weight: bold}.markdown-body dl dd{padding: 0 16px;margin-bottom: 16px}.markdown-body blockquote{padding: 0 15px;color: #777;border-left: 4px solid #ddd}.markdown-body blockquote>:first-child{margin-top: 0}.markdown-body blockquote>:last-child{margin-bottom: 0}.markdown-body table{display: block;width: 100%;overflow: auto;word-break: normal;word-break: keep-all}.markdown-body table th{font-weight: bold}.markdown-body table th,.markdown-body table td{padding: 6px 13px;border: 1px solid #ddd}.markdown-body table tr{background-color: #fff;border-top: 1px solid #ccc}.markdown-body table tr:nth-child(2n){background-color: #f8f8f8}.markdown-body img{max-width: 100%;box-sizing: border-box}.markdown-body span.frame{display: block;overflow: hidden}.markdown-body span.frame>span{display: block;float: left;width: auto;padding: 7px;margin: 13px 0 0;overflow: hidden;border: 1px solid #ddd}.markdown-body span.frame span img{display: block;float: left}.markdown-body span.frame span span{display: block;padding: 5px 0 0;clear: both;color: #333}.markdown-body span.align-center{display: block;overflow: hidden;clear: both}.markdown-body span.align-center>span{display: block;margin: 13px auto 0;overflow: hidden;text-align: center}.markdown-body span.align-center span img{margin: 0 auto;text-align: center}.markdown-body span.align-right{display: block;overflow: hidden;clear: both}.markdown-body span.align-right>span{display: block;margin: 13px 0 0;overflow: hidden;text-align: right}.markdown-body span.align-right span img{margin: 0;text-align: right}.markdown-body span.float-left{display: block;float: left;margin-right: 13px;overflow: hidden}.markdown-body span.float-left span{margin: 13px 0 0}.markdown-body span.float-right{display: block;float: right;margin-left: 13px;overflow: hidden}.markdown-body span.float-right>span{display: block;margin: 13px auto 0;overflow: hidden;text-align: right}.markdown-body code,.markdown-body tt{padding: 0;padding-top: 0.2em;padding-bottom: 0.2em;margin: 0;font-size: 85%;background-color: rgba(0,0,0,0.04);border-radius: 3px}.markdown-body code:before,.markdown-body code:after,.markdown-body tt:before,.markdown-body tt:after{letter-spacing: -0.2em;content: "\00a0"}.markdown-body code br,.markdown-body tt br{display: none}.markdown-body del code{text-decoration: inherit}.markdown-body pre>code{padding: 0;margin: 0;font-size: 100%;word-break: normal;white-space: pre;background: transparent;border: 0}.markdown-body .highlight{margin-bottom: 16px}.markdown-body .highlight pre,.markdown-body pre{padding: 16px;overflow: auto;font-size: 85%;line-height: 1.45;background-color: #f7f7f7;border-radius: 3px}.markdown-body .highlight pre{margin-bottom: 0;word-break: normal}.markdown-body pre{word-wrap: normal}.markdown-body pre code,.markdown-body pre tt{display: inline;max-width: initial;padding: 0;margin: 0;overflow: initial;line-height: inherit;word-wrap: normal;background-color: transparent;border: 0}.markdown-body pre code:before,.markdown-body pre code:after,.markdown-body pre tt:before,.markdown-body pre tt:after{content: normal}.markdown-body kbd{display: inline-block;padding: 3px 5px;font-size: 11px;line-height: 10px;color: #555;vertical-align: middle;background-color: #fcfcfc;border: solid 1px #ccc;border-bottom-color: #bbb;border-radius: 3px;box-shadow: inset 0 -1px 0 #bbb}.codehilite{background: #ffffff}.codehilite .c{color: #999988;font-style: italic}.codehilite .err{color: #a61717;background-color: #e3d2d2}.codehilite .k{color: #000000;font-weight: bold}.codehilite .o{color: #000000;font-weight: bold}.codehilite .cm{color: #999988;font-style: italic}.codehilite .cp{color: #999999;font-weight: bold}.codehilite .c1{color: #999988;font-style: italic}.codehilite .cs{color: #999999;font-weight: bold;font-style: italic}.codehilite .gd{color: #000000;background-color: #ffdddd}.codehilite .gd .x{color: #000000;background-color: #ffaaaa}.codehilite .ge{color: #000000;font-style: italic}.codehilite .gr{color: #aa0000}.codehilite .gh{color: #999999}.codehilite .gi{color: #000000;background-color: #ddffdd}.codehilite .gi .x{color: #000000;background-color: #aaffaa}.codehilite .go{color: #888888}.codehilite .gp{color: #555555}.codehilite .gs{font-weight: bold}.codehilite .gu{color: #aaaaaa}.codehilite .gt{color: #aa0000}.codehilite .kc{color: #000000;font-weight: bold}.codehilite .kd{color: #000000;font-weight: bold}.codehilite .kp{color: #000000;font-weight: bold}.codehilite .kr{color: #000000;font-weight: bold}.codehilite .kt{color: #445588;font-weight: bold}.codehilite .m{color: #009999}.codehilite .s{color: #d14}.codehilite .na{color: #008080}.codehilite .nb{color: #0086B3}.codehilite .nc{color: #445588;font-weight: bold}.codehilite .no{color: #008080}.codehilite .ni{color: #800080}.codehilite .ne{color: #990000;font-weight: bold}.codehilite .nf{color: #990000;font-weight: bold}.codehilite .nn{color: #555555}.codehilite .nt{color: #000080}.codehilite .nv{color: #008080}.codehilite .ow{color: #000000;font-weight: bold}.codehilite .w{color: #bbbbbb}.codehilite .mf{color: #009999}.codehilite .mh{color: #009999}.codehilite .mi{color: #009999}.codehilite .mo{color: #009999}.codehilite .sb{color: #d14}.codehilite .sc{color: #d14}.codehilite .sd{color: #d14}.codehilite .s2{color: #d14}.codehilite .se{color: #d14}.codehilite .sh{color: #d14}.codehilite .si{color: #d14}.codehilite .sx{color: #d14}.codehilite .sr{color: #009926}.codehilite .s1{color: #d14}.codehilite .ss{color: #990073}.codehilite .bp{color: #999999}.codehilite .vc{color: #008080}.codehilite .vg{color: #008080}.codehilite .vi{color: #008080}.codehilite .il{color: #009999}
    </style>
    <style type="text/css">
      .markdown-body hr{background:url("data:image/png;base64,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")}
    </style>
  </head>
  <body>
    <div class="container">
      <div id="markup">
        <article id="content" class="markdown-body">
          <h3 id="python">《Python 教程》授课笔记附件</h3>
<ul>
<li>讲师: 魏明择</li>
<li>时间: 2019</li>
</ul>
<h3 id="sys">系统模块 sys</h3>
<ul>
<li>运行时系统相关的信息</li>
</ul>
<h4 id="sys_1">sys模块的数据</h4>
<table>
<thead>
<tr>
<th>数据</th>
<th>描述</th>
</tr>
</thead>
<tbody>
<tr>
<td>sys.path</td>
<td>模块搜索路径 path[0] 是当前脚本程序的路径名，否则为 ''</td>
</tr>
<tr>
<td>sys.modules</td>
<td>已加载模块的字典</td>
</tr>
<tr>
<td>sys.version</td>
<td>版本信息字符串</td>
</tr>
<tr>
<td>sys.version_info</td>
<td>版本信息的命名元组</td>
</tr>
<tr>
<td>sys.platform</td>
<td>操作系统平台名称信息</td>
</tr>
<tr>
<td>sys.argv</td>
<td>命令行参数 argv[0] 代表当前脚本程序路径名</td>
</tr>
<tr>
<td>sys.copyright</td>
<td>获得Python版权相关的信息</td>
</tr>
<tr>
<td>sys.builtin_module_names</td>
<td>获得Python内建模块的名称（字符串元组）</td>
</tr>
</tbody>
</table>

<h4 id="sys_2">sys模块的函数</h4>
<table>
<thead>
<tr>
<th>函数名</th>
<th>描述</th>
</tr>
</thead>
<tbody>
<tr>
<td>sys.exit([arg])</td>
<td>退出程序，正常退出时sys.exit(0)</td>
</tr>
<tr>
<td>sys.getrecursionlimit()</td>
<td>得到递归嵌套层次限制（栈的深度）</td>
</tr>
<tr>
<td>sys.setrecursionlimit(n)</td>
<td>得到和修改递归嵌套层次限制（栈的深度）</td>
</tr>
</tbody>
</table>

        </article>
      </div>
    </div>

</body></html>