1.7 万 Star!一个简单实用的 Python 进度条库

爱学习的豆包 2021-02-21 09:38:33
tqdm


<pre style="letter-spacing: 0.544px; background-color: rgb(255, 255, 255);" data-mpa-powered-by="yiban.io"> <p style="letter-spacing: 0.544px; white-space: normal; color: rgb(0, 0, 0); font-size: 16px; font-family: -apple-system-font, BlinkMacSystemFont, &quot;Helvetica Neue&quot;, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei UI&quot;, &quot;Microsoft YaHei&quot;, Arial, sans-serif; text-align: center;"> <br> </p> <section data-tool="mdnice编辑器" data-website="https://www.mdnice.com" style="padding-right: 10px; padding-left: 10px; white-space: normal; font-family: Optima-Regular, Optima, PingFangSC-light, PingFangTC-light, &quot;PingFang SC&quot;, Cambria, Cochin, Georgia, Times, &quot;Times New Roman&quot;, serif; text-align: left; word-break: break-word; font-size: 14px; letter-spacing: 0.05em; color: rgb(89, 89, 89); line-height: 2;"> <p style="margin-right: 8px; margin-left: 8px; text-indent: 0em; letter-spacing: 0.544px; widows: 1; font-family: -apple-system-font, system-ui, &quot;Helvetica Neue&quot;, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei UI&quot;, &quot;Microsoft YaHei&quot;, Arial, sans-serif; text-align: center;"> <span style="color: rgb(136, 136, 136); font-family: -apple-system-font, BlinkMacSystemFont, &quot;Helvetica Neue&quot;, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei UI&quot;, &quot;Microsoft YaHei&quot;, Arial, sans-serif; font-size: 12px; font-weight: bolder; letter-spacing: 0.544px; text-indent: 0em; word-spacing: 2px;"><mpchecktext contenteditable="false" id="1613870292538_0.7095697924585018"> </mpchecktext></span> </p> </section> </pre>

<p style="white-space: normal; text-align: center;"> <img class="rich_pages" data-ratio="0.3333333333333333" data-s="300,640" src="https://mmbiz.qpic.cn/mmbiz_png/V7hBdY6BMtfUyxxT3YWWuJJg8kncWYICIBHUghXxZWjtCIFNiaeGq0X9icwtf33TCQLMYQib4DwK13g9ATRH3icQwg/640?wx_fmt=png" data-type="png" data-w="600"> </p> <p style="white-space: normal;"> <br> </p> <section data-tool="mdnice编辑器" data-website="https://www.mdnice.com" style="padding-right: 10px; padding-left: 10px; white-space: normal; color: black; word-break: break-word; text-align: left; font-family: Optima-Regular, Optima, PingFangSC-light, PingFangTC-light, &quot;PingFang SC&quot;, Cambria, Cochin, Georgia, Times, &quot;Times New Roman&quot;, serif; font-size: 14px; letter-spacing: 0.05em; line-height: 2;"> <figure data-tool="mdnice编辑器" style="margin-top: 10px; margin-bottom: 10px; display: flex; flex-direction: column; justify-content: center; align-items: center;"> <img data-ratio="0.45" src="https://mmbiz.qpic.cn/mmbiz_png/QFzRdz9libEbaz9yRwwTOb5osSbsPqkKg6JrLic1I77cO5PKSAv7YpibUNl603ObKoBtgibp3nJDoTMSn9l6ZZ7AVg/640?wx_fmt=png" data-type="png" data-w="700" style="margin-right: auto; margin-left: auto; display: block; box-shadow: rgb(51, 51, 51) 0px 0px 10px; border-radius: 5px;"> </figure> </section> <p data-tool="mdnice编辑器" style="padding-top: 8px; padding-bottom: 8px; white-space: normal; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 16px; text-align: left; background-color: rgb(255, 255, 255); line-height: 26px;"> <span style="color: rgb(89, 89, 89); font-family: Optima-Regular, Optima, PingFangSC-light, PingFangTC-light, &quot;PingFang SC&quot;, Cambria, Cochin, Georgia, Times, &quot;Times New Roman&quot;, serif; font-size: 15px; letter-spacing: 0.7px;">有的 Python 程序较大,执行需要花费较长的时间,有的用户在“盲目”地等待运行结果,但又不能明确知道程序进展到什么程度的时候,很有可能因心情急躁而终止程序。<mpchecktext contenteditable="false" id="1613870292539_0.990648515700687"> </mpchecktext></span> </p> <p data-tool="mdnice编辑器" style="padding-top: 8px; padding-bottom: 8px; white-space: normal; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 16px; text-align: left; background-color: rgb(255, 255, 255); line-height: 26px;"> <span style="color: rgb(89, 89, 89); font-family: Optima-Regular, Optima, PingFangSC-light, PingFangTC-light, &quot;PingFang SC&quot;, Cambria, Cochin, Georgia, Times, &quot;Times New Roman&quot;, serif; font-size: 15px; letter-spacing: 0.7px;">本文介绍的这个有着 1.7 万 Star 的开源库,就能解决这个烦恼。<mpchecktext contenteditable="false" id="1613870292540_0.14276449973371141"> </mpchecktext></span> </p> <figure data-tool="mdnice编辑器" style="margin-top: 10px; margin-bottom: 10px; white-space: normal; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 16px; text-align: left; background-color: rgb(255, 255, 255); display: flex; flex-direction: column; justify-content: center; align-items: center;"> <img data-ratio="0.352549889135255" data-type="png" data-w="902" src="https://mmbiz.qpic.cn/mmbiz_png/fhujzoQe7TpWtD8oiaUsgSJFCLaoMq5cU3uVcjaAOebeZ8hvt8uMbwXXSP29WSK3cEO5DrUCiaBUA10WnqggPianw/640?wx_fmt=png" style="margin-right: auto; margin-left: auto; display: block; box-sizing: border-box !important; width: 463px !important; visibility: visible !important;"> </figure> <p data-tool="mdnice编辑器" style="white-space: normal; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 16px; text-align: left; background-color: rgb(255, 255, 255); line-height: 26px;">https://github.com/tqdm/tqdm <mpchecktext contenteditable="false" id="1613870292541_0.38013013837788656"> </mpchecktext> </p> <h3 data-tool="mdnice编辑器" style="margin-top: 30px; margin-bottom: 15px; font-weight: bold; font-size: 20px; white-space: normal; color: rgb(0, 0, 0); font-family: Helvetica; text-align: left; background-color: rgb(255, 255, 255);"> <span style="font-size: 18px; color: rgb(0, 82, 255);">1、Tqdm 简介<mpchecktext contenteditable="false" id="1613870292542_0.46720602469384587"> </mpchecktext></span> </h3> <p data-tool="mdnice编辑器" style="white-space: normal; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 16px; text-align: left; background-color: rgb(255, 255, 255); line-height: 26px;">使用 Python Tqdm 进度条库,可以让 python 程序执行进度可视化。 <mpchecktext contenteditable="false" id="1613870292543_0.6752751740063665"> </mpchecktext> </p> <p style="white-space: normal; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 16px; background-color: rgb(255, 255, 255); text-align: center;"> <br> </p> <p style="white-space: normal; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 16px; text-align: left; background-color: rgb(255, 255, 255);"> <iframe class="video_iframe rich_pages wx_video_iframe" data-vidtype="2" data-mpvid="wxv_1712376995663118337" data-cover="http%3A%2F%2Fmmbiz.qpic.cn%2Fmmbiz_jpg%2FfhujzoQe7TpWtD8oiaUsgSJFCLaoMq5cUD8ViaM1F4VZuNMKkrNGYk1lUsLYicWW3fDLiad4MHhncFAr48wqNmbvVA%2F0%3Fwx_fmt%3Djpeg" allowfullscreen="" frameborder="0" data-ratio="1.6632124352331605" data-w="642" scrolling="no" width="578" height="325" src="/cgi-bin/readtemplate?t=tmpl/video_tmpl&amp;vid=wxv_1712376995663118337"></iframe> </p> <p data-tool="mdnice编辑器" style="padding-top: 8px; padding-bottom: 8px; white-space: normal; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 16px; background-color: rgb(255, 255, 255); line-height: 26px; text-align: center;"> <span style="color: rgb(136, 136, 136); font-size: 14px; letter-spacing: 0px;">示例<mpchecktext contenteditable="false" id="1613870292544_0.8978213363224574"> </mpchecktext></span> <br> </p> <blockquote data-tool="mdnice编辑器" style="color: rgb(0, 0, 0); line-height: 26px; font-size: 16px; white-space: normal; font-family: Helvetica; text-align: left; background-color: rgb(255, 255, 255);"> <p style="line-height: 26px;"> <span style="font-size: 12px;"><strong><span style="color: rgb(89, 89, 89); font-family: Optima-Regular, Optima, PingFangSC-light, PingFangTC-light, &quot;PingFang SC&quot;, Cambria, Cochin, Georgia, Times, &quot;Times New Roman&quot;, serif; letter-spacing: 0.7px;">在阿拉姆语(Aramaic)、希伯来语(Hebrew)、和阿拉伯语(Arabic)中,闪米特语(Semitic)词根q-d-m通常与前进或取得进步的意思挂钩。<mpchecktext contenteditable="false" id="1613870292545_0.07453517341823357"> </mpchecktext>例如,阿拉伯语单词 taqaddum (تقدّم) 的意思是“进步”。<mpchecktext contenteditable="false" id="1613870292546_0.5906906584074918"> </mpchecktext>进步是重要的,就像每一部令人愉悦的电影都会向你传达一个哲理——旅途和目的地一样重要。<mpchecktext contenteditable="false" id="1613870292547_0.9155591047627538"> </mpchecktext></span></strong></span> </p> </blockquote> <p data-tool="mdnice编辑器" style="white-space: normal; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 16px; text-align: left; background-color: rgb(255, 255, 255); line-height: 26px;">大多数程序都有一个明确目标,那就是程序运行的最终(结束)状态,成功还是失败! <mpchecktext contenteditable="false" id="1613870292548_0.42000533212708024"> </mpchecktext>但是往往有时候程序的运行可能需要很长时间。 <mpchecktext contenteditable="false" id="1613870292549_0.10647566367482253"> </mpchecktext>尽管计算机没有情感,不在乎程序执行时间的长短,可是人们是在乎的。 <mpchecktext contenteditable="false" id="1613870292550_0.3367709102788239"> </mpchecktext> </p> <p data-tool="mdnice编辑器" style="white-space: normal; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 16px; text-align: left; background-color: rgb(255, 255, 255); line-height: 26px;"> <br> </p> <p data-tool="mdnice编辑器" style="white-space: normal; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 16px; text-align: left; background-color: rgb(255, 255, 255); line-height: 26px;">随着时间推移,程序运行人员或用户的疑问会不断蔓延(程序崩溃了吗? <mpchecktext contenteditable="false" id="1613870292551_0.61109647947811"> </mpchecktext>磁盘跳动了吗? <mpchecktext contenteditable="false" id="1613870292552_0.4817770352012156"> </mpchecktext>操作系统是否将所有计算资源分配给了其他任务? <mpchecktext contenteditable="false" id="1613870292553_0.9052996639596194"> </mpchecktext>)当程序运行过程中长时间没有任何的进展迹象时,程序运行人员可能会疑虑、烦躁,不愿意继续等待下去。 <mpchecktext contenteditable="false" id="1613870292554_0.944740823147667"> </mpchecktext>而本文讲的 tqdm 库便有助于明确显示程序的执行进度。 <mpchecktext contenteditable="false" id="1613870292555_0.4787629156108948"> </mpchecktext> </p> <h3 data-tool="mdnice编辑器" style="margin-top: 30px; margin-bottom: 15px; font-weight: bold; font-size: 20px; white-space: normal; color: rgb(0, 0, 0); font-family: Helvetica; text-align: left; background-color: rgb(255, 255, 255);"> <span style="font-size: 18px; color: rgb(0, 82, 255);">2、使用方法<mpchecktext contenteditable="false" id="1613870292556_0.42231546684004995"> </mpchecktext></span> </h3> <p data-tool="mdnice编辑器" style="white-space: normal; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 16px; text-align: left; background-color: rgb(255, 255, 255); line-height: 26px;">tqdm 库模块可以在命令控制台一起使用,但是也支持我最喜欢的开发环境之一的 Jupyter notebook。 <mpchecktext contenteditable="false" id="1613870292557_0.07867050295887368"> </mpchecktext>如果想在 Jupyter notebook 中使用 tqdm,notebook 模块与 tqdm 接口兼容,需要导入 notebook 子模块并安装ipywidget。 <mpchecktext contenteditable="false" id="1613870292558_0.629576426502882"> </mpchecktext> </p> <p data-tool="mdnice编辑器" style="white-space: normal; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 16px; text-align: left; background-color: rgb(255, 255, 255); line-height: 26px;"> <br> </p> <p data-tool="mdnice编辑器" style="white-space: normal; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 16px; text-align: left; background-color: rgb(255, 255, 255); line-height: 26px;">这就意味着你可以在导入 tqdm 库操作之前做一下条件判断,这个判断方法是检查_main_模块中是否有get_ipython全局变量。 <mpchecktext contenteditable="false" id="1613870292559_0.9588033261176434"> </mpchecktext>虽然上面这个判断导库方法是一个启发式的,但它是一个相当准确的方法: <mpchecktext contenteditable="false" id="1613870292560_0.1231187935251632"> </mpchecktext> </p> <pre data-tool="mdnice编辑器" style="margin-top: 10px; margin-bottom: 10px; color: rgb(0, 0, 0); font-size: 16px; text-align: left; background-color: rgb(255, 255, 255); border-radius: 5px; box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;"> <span style="margin-bottom: -7px; display: block; background: url(&quot;https://mmbiz.qpic.cn/mmbiz_png/fhujzoQe7TpWtD8oiaUsgSJFCLaoMq5cUCymmS73sg4t2hWo7SZlUhKAKNoEqIvDZtVzXc41BFusBh2YZtCicQfQ/640?wx_fmt=png&quot;) 10px 10px / 40px no-repeat rgb(40, 44, 52); height: 30px; width: 657px; border-radius: 5px;"></span> <code style="padding: 15px 16px 16px; overflow-x: auto; color: rgb(171, 178, 191); display: -webkit-box; font-family: &quot;Operator Mono&quot;, Consolas, Monaco, Menlo, monospace; font-size: 12px; background: rgb(40, 44, 52); border-radius: 5px;"><span style="color: rgb(198, 120, 221); line-height: 26px;">import</span>&nbsp;sys<br><span style="color: rgb(198, 120, 221); line-height: 26px;">if</span>&nbsp;hasattr(sys.modules[<span style="color: rgb(152, 195, 121); line-height: 26px;">"__main__"</span>],<span style="color: rgb(152, 195, 121); line-height: 26px;">"get_ipython"</span>):<br>&nbsp;&nbsp;&nbsp;&nbsp;<span style="color: rgb(198, 120, 221); line-height: 26px;">from</span>&nbsp;tqdm&nbsp;<span style="color: rgb(198, 120, 221); line-height: 26px;">import</span>&nbsp;notebook&nbsp;<span style="color: rgb(198, 120, 221); line-height: 26px;">as</span>&nbsp;tqdm<br><span style="color: rgb(198, 120, 221); line-height: 26px;">else</span>:<br>&nbsp;&nbsp;&nbsp;&nbsp;<span style="color: rgb(198, 120, 221); line-height: 26px;">import</span>&nbsp;tqdm<mpchecktext contenteditable="false" id="1613870292561_0.22677490906251863"> </mpchecktext><br></code> </pre> <p data-tool="mdnice编辑器" style="white-space: normal; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 16px; text-align: left; background-color: rgb(255, 255, 255); line-height: 26px;">举个最简单的情况来助于理解一下,某程序需要执行一定数量的迭代(迭代次数预先可知),但是这些迭代中的每一次迭代花费大约相同的时间。 <mpchecktext contenteditable="false" id="1613870292562_0.32743566779320377"> </mpchecktext>例如,一个可以计算任意数字平方根的算法,算法是从1开始,然后计算一个进度估计。 <mpchecktext contenteditable="false" id="1613870292563_0.7153118693997842"> </mpchecktext> </p> <pre data-tool="mdnice编辑器" style="margin-top: 10px; margin-bottom: 10px; color: rgb(0, 0, 0); font-size: 16px; text-align: left; background-color: rgb(255, 255, 255); border-radius: 5px; box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;"> <span style="margin-bottom: -7px; display: block; background: url(&quot;https://mmbiz.qpic.cn/mmbiz_png/fhujzoQe7TpWtD8oiaUsgSJFCLaoMq5cUCymmS73sg4t2hWo7SZlUhKAKNoEqIvDZtVzXc41BFusBh2YZtCicQfQ/640?wx_fmt=png&quot;) 10px 10px / 40px no-repeat rgb(40, 44, 52); height: 30px; width: 657px; border-radius: 5px;"></span> <code style="padding: 15px 16px 16px; overflow-x: auto; color: rgb(171, 178, 191); display: -webkit-box; font-family: &quot;Operator Mono&quot;, Consolas, Monaco, Menlo, monospace; font-size: 12px; background: rgb(40, 44, 52); border-radius: 5px;"><span style="line-height: 26px;"><span style="color: rgb(198, 120, 221); line-height: 26px;">def</span>&nbsp;<span style="color: rgb(97, 174, 238); line-height: 26px;">improve_guess</span><span style="line-height: 26px;">(rt,&nbsp;n)</span>:</span><br>&nbsp;&nbsp;&nbsp;&nbsp;<span style="color: rgb(198, 120, 221); line-height: 26px;">return</span>&nbsp;(rt&nbsp;+&nbsp;n/rt)&nbsp;/&nbsp;<span style="color: rgb(209, 154, 102); line-height: 26px;">2<mpchecktext contenteditable="false" id="1613870292564_0.38068598775258566"> </mpchecktext></span><br></code> </pre> <p data-tool="mdnice编辑器" style="white-space: normal; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 16px; text-align: left; background-color: rgb(255, 255, 255); line-height: 26px;">对以上代码的少许改进可以让你更容易理解: <mpchecktext contenteditable="false" id="1613870292565_0.334725918180969"> </mpchecktext> </p> <pre data-tool="mdnice编辑器" style="margin-top: 10px; margin-bottom: 10px; color: rgb(0, 0, 0); font-size: 16px; text-align: left; background-color: rgb(255, 255, 255); border-radius: 5px; box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;"> <span style="margin-bottom: -7px; display: block; background: url(&quot;https://mmbiz.qpic.cn/mmbiz_png/fhujzoQe7TpWtD8oiaUsgSJFCLaoMq5cUCymmS73sg4t2hWo7SZlUhKAKNoEqIvDZtVzXc41BFusBh2YZtCicQfQ/640?wx_fmt=png&quot;) 10px 10px / 40px no-repeat rgb(40, 44, 52); height: 30px; width: 657px; border-radius: 5px;"></span> <code style="padding: 15px 16px 16px; overflow-x: auto; color: rgb(171, 178, 191); display: -webkit-box; font-family: &quot;Operator Mono&quot;, Consolas, Monaco, Menlo, monospace; font-size: 12px; background: rgb(40, 44, 52); border-radius: 5px;">guess&nbsp;=&nbsp;<span style="color: rgb(209, 154, 102); line-height: 26px;">1</span><br>target&nbsp;=&nbsp;<span style="color: rgb(209, 154, 102); line-height: 26px;">2</span><br><span style="color: rgb(198, 120, 221); line-height: 26px;">for</span>&nbsp;i&nbsp;<span style="color: rgb(198, 120, 221); line-height: 26px;">in</span>&nbsp;tqdm.trange(<span style="color: rgb(209, 154, 102); line-height: 26px;">10</span>):<br>&nbsp;&nbsp;&nbsp;&nbsp;guess&nbsp;=&nbsp;improve_guess(guess,&nbsp;target)<mpchecktext contenteditable="false" id="1613870292566_0.658737136238182"> </mpchecktext><br></code> </pre> <figure data-tool="mdnice编辑器" style="margin-top: 10px; margin-bottom: 10px; white-space: normal; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 16px; text-align: left; background-color: rgb(255, 255, 255); display: flex; flex-direction: column; justify-content: center; align-items: center;"> <img data-ratio="0.06666666666666667" data-type="png" data-w="675" src="https://mmbiz.qpic.cn/mmbiz_png/fhujzoQe7TpWtD8oiaUsgSJFCLaoMq5cUURczkhycV4mwQxM43cG2EHX9V4rMcBANV2QJZCDoWtcNRmMOeTbHfQ/640?wx_fmt=png" style="margin-right: auto; margin-left: auto; display: block; box-sizing: border-box !important; width: 675px !important; visibility: visible !important;"> </figure> <p data-tool="mdnice编辑器" style="white-space: normal; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 16px; text-align: left; background-color: rgb(255, 255, 255); line-height: 26px;">精确到小数点后十位: <mpchecktext contenteditable="false" id="1613870292567_0.14271185994376734"> </mpchecktext> </p> <pre data-tool="mdnice编辑器" style="margin-top: 10px; margin-bottom: 10px; color: rgb(0, 0, 0); font-size: 16px; text-align: left; background-color: rgb(255, 255, 255); border-radius: 5px; box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;"> <span style="margin-bottom: -7px; display: block; background: url(&quot;https://mmbiz.qpic.cn/mmbiz_png/fhujzoQe7TpWtD8oiaUsgSJFCLaoMq5cUCymmS73sg4t2hWo7SZlUhKAKNoEqIvDZtVzXc41BFusBh2YZtCicQfQ/640?wx_fmt=png&quot;) 10px 10px / 40px no-repeat rgb(40, 44, 52); height: 30px; width: 657px; border-radius: 5px;"></span> <code style="padding: 15px 16px 16px; overflow-x: auto; color: rgb(171, 178, 191); display: -webkit-box; font-family: &quot;Operator Mono&quot;, Consolas, Monaco, Menlo, monospace; font-size: 12px; background: rgb(40, 44, 52); border-radius: 5px;">round(<span style="color: rgb(209, 154, 102); line-height: 26px;">2</span>&nbsp;-&nbsp;guess*guess,&nbsp;<span style="color: rgb(209, 154, 102); line-height: 26px;">10</span>)<br><span style="color: rgb(209, 154, 102); line-height: 26px;">0.0<mpchecktext contenteditable="false" id="1613870292568_0.21110173786423925"> </mpchecktext></span><br></code> </pre> <p data-tool="mdnice编辑器" style="white-space: normal; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 16px; text-align: left; background-color: rgb(255, 255, 255); line-height: 26px;">再举一个稍微复杂的 tqdm 例子,当处理的元素数量已知且计算每个元素的时间相似。 <mpchecktext contenteditable="false" id="1613870292569_0.9689761300339252"> </mpchecktext>例如,计算一些随机数字的乘机: <mpchecktext contenteditable="false" id="1613870292570_0.4353738582883355"> </mpchecktext> </p> <pre data-tool="mdnice编辑器" style="margin-top: 10px; margin-bottom: 10px; color: rgb(0, 0, 0); font-size: 16px; text-align: left; background-color: rgb(255, 255, 255); border-radius: 5px; box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;"> <span style="margin-bottom: -7px; display: block; background: url(&quot;https://mmbiz.qpic.cn/mmbiz_png/fhujzoQe7TpWtD8oiaUsgSJFCLaoMq5cUCymmS73sg4t2hWo7SZlUhKAKNoEqIvDZtVzXc41BFusBh2YZtCicQfQ/640?wx_fmt=png&quot;) 10px 10px / 40px no-repeat rgb(40, 44, 52); height: 30px; width: 657px; border-radius: 5px;"></span> <code style="padding: 15px 16px 16px; overflow-x: auto; color: rgb(171, 178, 191); display: -webkit-box; font-family: &quot;Operator Mono&quot;, Consolas, Monaco, Menlo, monospace; font-size: 12px; background: rgb(40, 44, 52); border-radius: 5px;"><span style="color: rgb(198, 120, 221); line-height: 26px;">import</span>&nbsp;random<br>numbers&nbsp;=&nbsp;[random.uniform(<span style="color: rgb(209, 154, 102); line-height: 26px;">0</span>,&nbsp;<span style="color: rgb(209, 154, 102); line-height: 26px;">2.8</span>)&nbsp;<span style="color: rgb(198, 120, 221); line-height: 26px;">for</span>&nbsp;i&nbsp;<span style="color: rgb(198, 120, 221); line-height: 26px;">in</span>&nbsp;range(<span style="color: rgb(209, 154, 102); line-height: 26px;">100</span>)]<br>numbers[:<span style="color: rgb(209, 154, 102); line-height: 26px;">5</span>]<br>[<span style="color: rgb(209, 154, 102); line-height: 26px;">2.6575636572230916</span>,<br><span style="color: rgb(209, 154, 102); line-height: 26px;">0.1286674965830302</span>,<br><span style="color: rgb(209, 154, 102); line-height: 26px;">1.0634250104041332</span>,<br><span style="color: rgb(209, 154, 102); line-height: 26px;">1.1760969844376505</span>,<br><span style="color: rgb(209, 154, 102); line-height: 26px;">0.45192978568125486</span>]<mpchecktext contenteditable="false" id="1613870292571_0.9879254603631429"> </mpchecktext><br></code> </pre> <p data-tool="mdnice编辑器" style="white-space: normal; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 16px; text-align: left; background-color: rgb(255, 255, 255); line-height: 26px;">数值元素有了,接下来使用 tqdm 显示进度条,使用 tqdm 最简单的方法是封装 Python 中可迭代的对象。 <mpchecktext contenteditable="false" id="1613870292572_0.2948801335315765"> </mpchecktext> </p> <pre data-tool="mdnice编辑器" style="margin-top: 10px; margin-bottom: 10px; color: rgb(0, 0, 0); font-size: 16px; text-align: left; background-color: rgb(255, 255, 255); border-radius: 5px; box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;"> <span style="margin-bottom: -7px; display: block; background: url(&quot;https://mmbiz.qpic.cn/mmbiz_png/fhujzoQe7TpWtD8oiaUsgSJFCLaoMq5cUCymmS73sg4t2hWo7SZlUhKAKNoEqIvDZtVzXc41BFusBh2YZtCicQfQ/640?wx_fmt=png&quot;) 10px 10px / 40px no-repeat rgb(40, 44, 52); height: 30px; width: 657px; border-radius: 5px;"></span> <code style="padding: 15px 16px 16px; overflow-x: auto; color: rgb(171, 178, 191); display: -webkit-box; font-family: &quot;Operator Mono&quot;, Consolas, Monaco, Menlo, monospace; font-size: 12px; background: rgb(40, 44, 52); border-radius: 5px;">result&nbsp;=&nbsp;<span style="color: rgb(209, 154, 102); line-height: 26px;">1</span><br><span style="color: rgb(198, 120, 221); line-height: 26px;">for</span>&nbsp;num&nbsp;<span style="color: rgb(198, 120, 221); line-height: 26px;">in</span>&nbsp;tqdm.tqdm(numbers):<br>&nbsp;&nbsp;&nbsp;&nbsp;result&nbsp;*=&nbsp;num<br>result<br><span style="color: rgb(209, 154, 102); line-height: 26px;">2.4081854901728303<mpchecktext contenteditable="false" id="1613870292573_0.08637817275547355"> </mpchecktext></span><br></code> </pre> <figure data-tool="mdnice编辑器" style="margin-top: 10px; margin-bottom: 10px; white-space: normal; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 16px; text-align: left; background-color: rgb(255, 255, 255); display: flex; flex-direction: column; justify-content: center; align-items: center;"> <img data-ratio="0.0725925925925926" data-type="png" data-w="675" src="https://mmbiz.qpic.cn/mmbiz_png/fhujzoQe7TpWtD8oiaUsgSJFCLaoMq5cUAoORwYcziahDpEuVDVv6epOBrgCEhxic9ViceicFwJWudY3xO6Sp2qnl1w/640?wx_fmt=png" style="margin-right: auto; margin-left: auto; display: block; box-sizing: border-box !important; width: 675px !important; visibility: visible !important;"> </figure> <p data-tool="mdnice编辑器" style="white-space: normal; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 16px; text-align: left; background-color: rgb(255, 255, 255); line-height: 26px;">但是,不是所有的事情都是可预测的,其中不可预测的事情之一是网络速度。 <mpchecktext contenteditable="false" id="1613870292574_0.5501801752126871"> </mpchecktext>下载大文件时,衡量进度的唯一的方法是显示已经下载了多少文件: <mpchecktext contenteditable="false" id="1613870292575_0.8337753190253012"> </mpchecktext> </p> <pre data-tool="mdnice编辑器" style="margin-top: 10px; margin-bottom: 10px; color: rgb(0, 0, 0); font-size: 16px; text-align: left; background-color: rgb(255, 255, 255); border-radius: 5px; box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;"> <span style="margin-bottom: -7px; display: block; background: url(&quot;https://mmbiz.qpic.cn/mmbiz_png/fhujzoQe7TpWtD8oiaUsgSJFCLaoMq5cUCymmS73sg4t2hWo7SZlUhKAKNoEqIvDZtVzXc41BFusBh2YZtCicQfQ/640?wx_fmt=png&quot;) 10px 10px / 40px no-repeat rgb(40, 44, 52); height: 30px; width: 657px; border-radius: 5px;"></span> <code style="padding: 15px 16px 16px; overflow-x: auto; color: rgb(171, 178, 191); display: -webkit-box; font-family: &quot;Operator Mono&quot;, Consolas, Monaco, Menlo, monospace; font-size: 12px; background: rgb(40, 44, 52); border-radius: 5px;">url&nbsp;=&nbsp;<span style="color: rgb(152, 195, 121); line-height: 26px;">"https://www.python.org/ftp/python/3.9.0/Python-3.9.0.tgz"</span><br><span style="color: rgb(198, 120, 221); line-height: 26px;">import</span>&nbsp;httpx<br><span style="color: rgb(198, 120, 221); line-height: 26px;">with</span>&nbsp;httpx.stream(<span style="color: rgb(152, 195, 121); line-height: 26px;">"GET"</span>,&nbsp;url)&nbsp;<span style="color: rgb(198, 120, 221); line-height: 26px;">as</span>&nbsp;response:<br>&nbsp;&nbsp;&nbsp;&nbsp;total&nbsp;=&nbsp;int(response.headers[<span style="color: rgb(152, 195, 121); line-height: 26px;">"Content-Length"</span>])<br>&nbsp;&nbsp;&nbsp;&nbsp;<span style="color: rgb(198, 120, 221); line-height: 26px;">with</span>&nbsp;tqdm.tqdm(total=total)&nbsp;<span style="color: rgb(198, 120, 221); line-height: 26px;">as</span>&nbsp;progress:<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="color: rgb(198, 120, 221); line-height: 26px;">for</span>&nbsp;chunk&nbsp;<span style="color: rgb(198, 120, 221); line-height: 26px;">in</span>&nbsp;response.iter_bytes():<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;progress.update(len(chunk))<mpchecktext contenteditable="false" id="1613870292576_0.5813966754295894"> </mpchecktext><br></code> </pre> <figure data-tool="mdnice编辑器" style="margin-top: 10px; margin-bottom: 10px; white-space: normal; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 16px; text-align: left; background-color: rgb(255, 255, 255); display: flex; flex-direction: column; justify-content: center; align-items: center;"> <img data-ratio="0.047407407407407405" data-type="png" data-w="675" src="https://mmbiz.qpic.cn/mmbiz_png/fhujzoQe7TpWtD8oiaUsgSJFCLaoMq5cUyXJ4Ve4Ew5c1N68tdjUJxlofPicibmpcw4r2GQSYyHQo7mKtWvhbIgeQ/640?wx_fmt=png" style="margin-right: auto; margin-left: auto; display: block; box-sizing: border-box !important; width: 675px !important; visibility: visible !important;"> </figure> <p data-tool="mdnice编辑器" style="white-space: normal; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 16px; text-align: left; background-color: rgb(255, 255, 255); line-height: 26px;">有时,“嵌套”进度条是有意义的。 <mpchecktext contenteditable="false" id="1613870292577_0.7870996635671821"> </mpchecktext>例如,如果正在下载一个目录,则需要一个跟踪文件的进度条和每个文件的进度条。 <mpchecktext contenteditable="false" id="1613870292578_0.35637092896327527"> </mpchecktext>下面是一个示例(但没有实际下载目录): <mpchecktext contenteditable="false" id="1613870292579_0.2193111243561241"> </mpchecktext> </p> <pre data-tool="mdnice编辑器" style="margin-top: 10px; margin-bottom: 10px; color: rgb(0, 0, 0); font-size: 16px; text-align: left; background-color: rgb(255, 255, 255); border-radius: 5px; box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;"> <span style="margin-bottom: -7px; display: block; background: url(&quot;https://mmbiz.qpic.cn/mmbiz_png/fhujzoQe7TpWtD8oiaUsgSJFCLaoMq5cUCymmS73sg4t2hWo7SZlUhKAKNoEqIvDZtVzXc41BFusBh2YZtCicQfQ/640?wx_fmt=png&quot;) 10px 10px / 40px no-repeat rgb(40, 44, 52); height: 30px; width: 657px; border-radius: 5px;"></span> <code style="padding: 15px 16px 16px; overflow-x: auto; color: rgb(171, 178, 191); display: -webkit-box; font-family: &quot;Operator Mono&quot;, Consolas, Monaco, Menlo, monospace; font-size: 12px; background: rgb(40, 44, 52); border-radius: 5px;">files&nbsp;=&nbsp;[<span style="color: rgb(152, 195, 121); line-height: 26px;">f"vid-<span style="color: rgb(224, 108, 117); line-height: 26px;">{i}</span>.mp4"</span>&nbsp;<span style="color: rgb(198, 120, 221); line-height: 26px;">for</span>&nbsp;i&nbsp;<span style="color: rgb(198, 120, 221); line-height: 26px;">in</span>&nbsp;range(<span style="color: rgb(209, 154, 102); line-height: 26px;">4</span>)]<br><span style="color: rgb(198, 120, 221); line-height: 26px;">for</span>&nbsp;fname&nbsp;<span style="color: rgb(198, 120, 221); line-height: 26px;">in</span>&nbsp;tqdm.tqdm(files,&nbsp;desc=<span style="color: rgb(152, 195, 121); line-height: 26px;">"files"</span>):<br>&nbsp;&nbsp;&nbsp;&nbsp;total&nbsp;=&nbsp;random.randrange(<span style="color: rgb(209, 154, 102); line-height: 26px;">10</span>**<span style="color: rgb(209, 154, 102); line-height: 26px;">9</span>,&nbsp;<span style="color: rgb(209, 154, 102); line-height: 26px;">2</span>&nbsp;*&nbsp;<span style="color: rgb(209, 154, 102); line-height: 26px;">10</span>**<span style="color: rgb(209, 154, 102); line-height: 26px;">9</span>)<br>&nbsp;&nbsp;&nbsp;&nbsp;<span style="color: rgb(198, 120, 221); line-height: 26px;">with</span>&nbsp;tqdm.tqdm(total=total,&nbsp;desc=fname)&nbsp;<span style="color: rgb(198, 120, 221); line-height: 26px;">as</span>&nbsp;progress:<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;current&nbsp;=&nbsp;<span style="color: rgb(209, 154, 102); line-height: 26px;">0</span><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="color: rgb(198, 120, 221); line-height: 26px;">while</span>&nbsp;current&nbsp;&lt;&nbsp;total:<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;chunk_size&nbsp;=&nbsp;min(random.randrange(<span style="color: rgb(209, 154, 102); line-height: 26px;">10</span>**<span style="color: rgb(209, 154, 102); line-height: 26px;">3</span>,&nbsp;<span style="color: rgb(209, 154, 102); line-height: 26px;">10</span>**<span style="color: rgb(209, 154, 102); line-height: 26px;">5</span>),&nbsp;total&nbsp;-&nbsp;current)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;current&nbsp;+=&nbsp;chunk_size<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="color: rgb(198, 120, 221); line-height: 26px;">if</span>&nbsp;random.uniform(<span style="color: rgb(209, 154, 102); line-height: 26px;">0</span>,&nbsp;<span style="color: rgb(209, 154, 102); line-height: 26px;">1</span>)&nbsp;&lt;&nbsp;<span style="color: rgb(209, 154, 102); line-height: 26px;">0.01</span>:<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;time.sleep(<span style="color: rgb(209, 154, 102); line-height: 26px;">0.1</span>)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;progress.update(chunk_size)<mpchecktext contenteditable="false" id="1613870292580_0.3759443275999621"> </mpchecktext><br></code> </pre> <figure data-tool="mdnice编辑器" style="margin-top: 10px; margin-bottom: 10px; white-space: normal; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 16px; text-align: left; background-color: rgb(255, 255, 255); display: flex; flex-direction: column; justify-content: center; align-items: center;"> <img data-ratio="0.1511111111111111" data-type="png" data-w="675" src="https://mmbiz.qpic.cn/mmbiz_png/fhujzoQe7TpWtD8oiaUsgSJFCLaoMq5cUmOKztNQXVBv2fwTr3DFtLe5HelDxWHpmKlqsjUYHmHYpgcuYAEKkLA/640?wx_fmt=png" style="margin-right: auto; margin-left: auto; display: block; box-sizing: border-box !important; width: 675px !important; visibility: visible !important;"> </figure> <p data-tool="mdnice编辑器" style="white-space: normal; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 16px; text-align: left; background-color: rgb(255, 255, 255); line-height: 26px;">因此,如果你的程序需要一段时间才能显示最终结果,为了避免用户感到沮丧: <mpchecktext contenteditable="false" id="1613870292582_0.34837786137867366"> </mpchecktext>显示它的进度情况! <mpchecktext contenteditable="false" id="1613870292581_0.4128478996743705"> </mpchecktext> </p> <p style="white-space: normal; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 16px; text-align: right; background-color: rgb(255, 255, 255); line-height: 26px;"> <br> </p>

[拿走不谢!Python 3.9 官方中文文档,限时领!] (http://dwz.date/dE6v)

[限时!速领!14张高清Python速查表,效率提升必备!] (http://dwz.date/dE6w)

[GitHub标星3W+,80个Python案例,带你轻松玩转Python学习!] (http://dwz.date/dE64)

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https://my.oschina.net/u/4630617/blog/4958195

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