100 lines
24 KiB
JavaScript
100 lines
24 KiB
JavaScript
import{_ as n,D as t,c as h,j as s,I as l,w as p,a as i,a4 as k,o as e}from"./chunks/framework.DtvhUNIn.js";const q=JSON.parse('{"title":"阶段四：高阶函数","description":"","frontmatter":{},"headers":[],"relativePath":"技术资源汇总(杭电支持版)/3.编程思维体系构建/3.6.4.4阶段四：高阶函数.md","filePath":"技术资源汇总(杭电支持版)/3.编程思维体系构建/3.6.4.4阶段四：高阶函数.md"}'),d={name:"技术资源汇总(杭电支持版)/3.编程思维体系构建/3.6.4.4阶段四：高阶函数.md"},g=s("h1",{id:"阶段四-高阶函数",tabindex:"-1"},[i("阶段四：高阶函数 "),s("a",{class:"header-anchor",href:"#阶段四-高阶函数","aria-label":'Permalink to "阶段四：高阶函数"'},"")],-1),r={class:"warning custom-block"},E=s("p",{class:"custom-block-title"},"🐱 阅读以及完成本部分内容可以帮助你有效减少代码冗余。",-1),c=s("p",null,"让你完成更为优雅的代码",-1),y=s("p",null,"各位要记住的是",-1),F=s("strong",null,"代码首先是给人看的",-1),o=s("p",null,"机器看的永远只是你的机器码。",-1),_=s("p",null,[i("可参考教程 "),s("a",{href:"https://zhuanlan.zhihu.com/p/80960485",target:"_blank",rel:"noreferrer"},"Lambda")],-1),u=k(`<h2 id="lambda-介绍" tabindex="-1">Lambda 介绍 <a class="header-anchor" href="#lambda-介绍" aria-label="Permalink to "Lambda 介绍""></a></h2><p>Lambda 表达式是通过指定两件事来评估函数的表达式：参数和返回表达式。</p><p>请尝试阅读以下英文表格，对比函数与 lambda 表达式的不同</p><h2 id="lambda-实验" tabindex="-1">Lambda 实验 <a class="header-anchor" href="#lambda-实验" aria-label="Permalink to "Lambda 实验""></a></h2><p>以下代码 python 会显示什么？通过对这些代码的实验，加深你对代码的学习</p><p>提示：当你对解释器输入 x 或 x=none 时什么都没有</p><div class="language-python vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">python</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">>>></span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> lambda</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> x: x </span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"># A lambda expression with one parameter x</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">>>></span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> a </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> lambda</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> x: x </span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"># Assigning the lambda function to the name a</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">>>></span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> a(</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">5</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">)</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">>>></span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> (</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">lambda</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">: </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">3</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">)() </span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"># Using a lambda expression as an operator in a call exp.</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">>>></span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> b </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> lambda</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> x: </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">lambda</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">: x </span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"># Lambdas can return other lambdas!</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">>>></span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> c </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> b(</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">88</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">)</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">>>></span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> c</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">>>></span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> c()</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">>>></span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> d </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> lambda</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> f: f(</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">4</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">) </span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"># They can have functions as arguments as well.</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">>>></span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> def</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> square</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(x):</span></span>
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<span class="line"><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">...</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> x </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">*</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> x</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">>>></span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> d(square)</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">______</span></span></code></pre></div><div class="language-python vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">python</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">>>></span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> higher_order_lambda </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> lambda</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> f: </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">lambda</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> x: f(x)</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">>>></span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> g </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> lambda</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> x: x </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">*</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> x</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">>>></span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> higher_order_lambda(</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">2</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">)(g) </span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"># Which argument belongs to which function call?</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">>>></span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> higher_order_lambda(g)(</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">2</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">)</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">>>></span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> call_thrice </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> lambda</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> f: </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">lambda</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> x: f(f(f(x)))</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">>>></span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> call_thrice(</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">lambda</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> y: y </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">+</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> 1</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">)(</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">0</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">)</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">>>></span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> print_lambda </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> lambda</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> z: </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">print</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(z) </span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"># When is the return expression of a lambda expression executed?</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">>>></span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> print_lambda</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">>>></span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> one_thousand </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> print_lambda(</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">1000</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">)</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">>>></span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> one_thousand</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">______</span></span></code></pre></div><h2 id="任务" tabindex="-1">任务 <a class="header-anchor" href="#任务" aria-label="Permalink to "任务""></a></h2><p>P9:我们发现以下两个函数看起来实现的非常相似，是否可以进行改进，将其整合？</p><div class="language-python vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">python</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">def</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> count_factors</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(n):</span></span>
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<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> """Return the number of positive factors that n has.</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> >>> </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">count_factors(6)</span></span>
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<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> 4 # 1, 2, 3, 6</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> >>> </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">count_factors(4)</span></span>
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<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> 3 # 1, 2, 4</span></span>
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<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> """</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> i, count </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> 1</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">0</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> while</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> i </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"><=</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> n:</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> if</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> n </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">%</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> i </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">==</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> 0</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">:</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> count </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">+=</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> 1</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> i </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">+=</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> 1</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> count</span></span>
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<span class="line"></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">def</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> count_primes</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(n):</span></span>
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<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> """Return the number of prime numbers up to and including n.</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> >>> </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">count_primes(6)</span></span>
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<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> 3 # 2, 3, 5</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> >>> </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">count_primes(13)</span></span>
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<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> 6 # 2, 3, 5, 7, 11, 13</span></span>
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<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> """</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> i, count </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> 1</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">0</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> while</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> i </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"><=</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> n:</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> if</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> is_prime(i):</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> count </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">+=</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> 1</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> i </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">+=</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> 1</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> count</span></span>
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<span class="line"></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">def</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> is_prime</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(n):</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> count_factors(n) </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">==</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> 2</span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"> # only factors are 1 and n</span></span></code></pre></div><p>需求：</p><p>你需要通过自己写一个函数： <code>count_cond</code> ，来接受一个含有两个参数的函数 <code>condition(n, i)</code>(使用 lambda 表达式)，</p><p>且<code>condition</code>函数应该满足第一个参数为 N，而第二个参数将会在<code>condition</code>函数中遍历 1 to N。</p><p><code>count_cond</code> 将返回一个单参数函数 (ps：一个匿名函数)，此单参数函数将会在被调用时返回 1 to N 中所有满足<code>condition</code>的数字的个数 (如：1 到 n 中素数的个数)。</p><div class="language-python vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">python</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">def</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> count_cond</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(condition):</span></span>
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<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> """Returns a function with one parameter N that counts all the numbers from</span></span>
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<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> 1 to N that satisfy the two-argument predicate function Condition, where</span></span>
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<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> the first argument for Condition is N and the second argument is the</span></span>
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<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> number from 1 to N.</span></span>
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<span class="line"></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> >>> </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">count_factors = count_cond(lambda n, i: n % i == 0)</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> >>> </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">count_factors(2) # 1, 2</span></span>
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<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> 2</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> >>> </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">count_factors(4) # 1, 2, 4</span></span>
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<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> 3</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> >>> </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">count_factors(12) # 1, 2, 3, 4, 6, 12</span></span>
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<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> 6</span></span>
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<span class="line"></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> >>> </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">is_prime = lambda n, i: count_factors(i) == 2</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> >>> </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">count_primes = count_cond(is_prime)</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> >>> </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">count_primes(2) # 2</span></span>
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<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> 1</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> >>> </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">count_primes(3) # 2, 3</span></span>
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<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> 2</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> >>> </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">count_primes(4) # 2, 3</span></span>
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<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> 2</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> >>> </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">count_primes(5) # 2, 3, 5</span></span>
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<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> 3</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> >>> </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">count_primes(20) # 2, 3, 5, 7, 11, 13, 17, 19</span></span>
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<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> 8</span></span>
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<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> """</span></span>
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<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> "*** YOUR CODE HERE ***"</span></span></code></pre></div>`,16);function A(D,C,m,b,B,f){const a=t("font");return e(),h("div",null,[g,s("div",r,[E,c,y,l(a,{size:"5"},{default:p(()=>[F]),_:1}),o,_]),u])}const v=n(d,[["render",A]]);export{q as __pageData,v as default};
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