我主要用 C/C++ 开发，但是出现了用 Python-3 编写应用程序的任务，遇到了对解释器的一些误解。
我犯了一个错误，有一段时间没有注意到它，因为 Python 做的一切“几乎”都是正确的。任务是从列表中删除 N/2 个值，其中 N 是它们的总数。
一个简单的例子来描述这种情况：
array = []
for i in range(10):
array.append(i)
# array [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
i = 0
for item in array:
if i < len(array)/2:
array.remove(item)
# array [1, 3, 5, 7, 9]
如您所见，我没有i在第二个循环中增加变量，但不知何故，解释器仍然从数组中删除零和每个偶数元素。
实际上问题是，它是如何工作的？
1）代码必须是跨平台的，或者2a代码选项（在Windows和Linux下）
2）我需要跟踪用户何时按下 Shift+Enter
3) 控制台程序
此代码返回 0，尽管根据文档它应该返回 -1。难道我做错了什么？.NET 版本是 4.7.1。
Console.WriteLine("Dddd".IndexOf("⚽️", 0));
请告诉我在这种情况下如何最好地弥补，蜂窝？
我做了类似的事情，但有相同的边界（我附上了代码）。
在这种情况下，一切都变得更加困难，我没有太多想法如何做得更好。
第二个问题是如何正确定位这些块，以便以后不必过多地处理媒体查询？
.benefits__wrapper {
text-align: center;
padding-top: 3.9881vw;
padding-bottom: 15px; }
.benefits__heading {
margin-bottom: 6.84524vw; }
.benefits__items {
display: -webkit-box;
display: -ms-flexbox;
display: flex;
-webkit-box-align: center;
-ms-flex-align: center;
align-items: center; }
@media screen and (max-width: 759px) {
.benefits__items {
-ms-flex-wrap: wrap;
flex-wrap: wrap; } }
@media screen and (max-width: 759px) {
.benefits__item {
width: 40%;
margin: 20px 0; } }
@media screen and (max-width: 459px) {
.benefits__item {
width: 100%; } }
.item {
text-align: center;
margin-right: 40px; }
@media screen and (max-width: 459px) {
.item {
margin-right: 0; } }
.item:last-child {
margin-right: 0; }
.item__title {
position: relative;
display: -webkit-box;
display: -ms-flexbox;
display: flex;
-webkit-box-align: center;
-ms-flex-align: center;
align-items: center;
-webkit-box-pack: center;
-ms-flex-pack: center;
justify-content: center;
font: 1.25rem/1 "PFEncoreSansPro-Regular";
color: #868686;
margin-bottom: 34px; }
.item__info {
font: 0.9375rem/1.125rem "PFEncoreSansPro-Thin";
color: #adadad;
margin-bottom: 3.03571vw; }
.hexagon {
margin: 0 auto 54px; }
.hexagon__icon {
fill: #fff;
-webkit-transition: background-color .35s;
transition: background-color .35s; }
.hexagon,
.hexagon__item_inner {
position: relative;
width: 91px;
height: 52px;
background-color: #fe8682;
-webkit-transition: background-color .35s;
transition: background-color .35s; }
.hexagon:before,
.hexagon:after {
content: '';
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
background-color: #fe8682;
-webkit-transition: background-color .35s;
transition: background-color .35s; }
.hexagon:before,
.hexagon__item_inner:before {
-webkit-transform: rotate(120deg);
transform: rotate(120deg); }
.hexagon:after,
.hexagon__item_inner:after {
-webkit-transform: rotate(60deg);
transform: rotate(60deg); }
.hexagon__item_inner {
position: absolute;
left: 0;
top: 0;
-webkit-transform: scale(0.9);
transform: scale(0.9);
background-color: #fc635e;
z-index: 1; }
.hexagon__item_inner:before,
.hexagon__item_inner:after {
content: '';
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
-webkit-transition: background-color .35s;
transition: background-color .35s;
background-color: #fc635e; }
.hexagon__content {
position: relative;
display: -webkit-box;
display: -ms-flexbox;
display: flex;
-webkit-box-align: center;
-ms-flex-align: center;
align-items: center;
-webkit-box-pack: center;
-ms-flex-pack: center;
justify-content: center;
width: 100%;
height: 100%;
z-index: 1; }
.hexagon:hover,
.hexagon:hover:before,
.hexagon:hover:after {
background-color: #fc635e; }
.hexagon:hover .hexagon__item_inner,
.hexagon:hover .hexagon__item_inner:before,
.hexagon:hover .hexagon__item_inner:after {
background-color: #fff; }
.hexagon:hover .hexagon__icon {
fill: #fc635e; }<section class="benefits">
<div class="benefits__wrapper container">
<div class="benefits__heading">
<div class="heading_usual">
<div class="heading__title uppercase">What can
<div class="span heading_active">you receive?</div>
</div>
<div class="heading__subtitle">
Daisy is sagittis sem nibh id elit. Duis sed odio sit amet nibh vulputate cursus a
sit amet mauris. Morbi accumsan ipsum
</div>
</div>
</div>
<div class="benefits__items">
<article class="benefits__item item">
<div class="hexagon">
<div class="hexagon__item_inner"></div>
<div class="hexagon__content">
<svg class="hexagon__icon icon_xl">
<use xlink:href="svg/sprite.svg#rocket"></use>
</svg>
</div>
</div>
<div class="item__title uppercase">Clents</div>
<div class="item__info">
This is Photoshop's version of Lorem Ipsum. Proin gravida nibh vel velit auctor aliquet. Aenean</div>
</article>
<article class="benefits__item item">
<div class="hexagon">
<div class="hexagon__item_inner"></div>
<div class="hexagon__content">
<svg class="hexagon__icon icon_xl">
<use xlink:href="svg/sprite.svg#web-design"></use>
</svg>
</div>
</div>
<div class="item__title uppercase">branding</div>
<div class="item__info">
This is Photoshop's version of Lorem Ipsum. Proin gravida nibh vel velit auctor aliquet. Aenean</div>
</article>
<article class="benefits__item item">
<div class="hexagon">
<div class="hexagon__item_inner"></div>
<div class="hexagon__content">
<svg class="hexagon__icon icon_xl">
<use xlink:href="svg/sprite.svg#diagram"></use>
</svg>
</div>
</div>
<div class="item__title uppercase">marketing</div>
<div class="item__info">
This is Photoshop's version of Lorem Ipsum. Proin gravida nibh vel velit auctor aliquet. Aenean</div>
</article>
<article class="benefits__item item">
<div class="hexagon">
<div class="hexagon__item_inner"></div>
<div class="hexagon__content">
<svg class="hexagon__icon icon_xl">
<use xlink:href="svg/sprite.svg#speaker"></use>
</svg>
</div>
</div>
<div class="item__title uppercase">adv.</div>
<div class="item__info">
This is Photoshop's version of Lorem Ipsum. Proin gravida nibh vel velit auctor aliquet. Aenean</div>
</article>
</div>我需要以某种方式优化来自矢量编辑器的代码Inkscape
例如，我正在绘制一个基本的 SVG 形状 - circle，其公式仅包含几行，以及所有 SVG 格式声明：
<svg version="1.1" xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink" width="40" height="40" viewBox="0 0 40 40" >
<circle cx="20" cy="20" r="18.1" style="fill:none;stroke-width:2;stroke:#00e700"/>
</svg> 我在矢量编辑器中绘制了相同的圆圈Inkscape并将其与生成的代码进行比较：
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<svg
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:cc="http://creativecommons.org/ns#"
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:svg="http://www.w3.org/2000/svg"
xmlns="http://www.w3.org/2000/svg"
xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
version="1.1"
width="40"
height="40"
viewBox="0 0 40 40"
id="svg2"
sodipodi:docname="Shape-circle.svg"
inkscape:version="0.92.3 (2405546, 2018-03-11)">
<metadata
id="metadata8">
<rdf:RDF>
<cc:Work
rdf:about="">
<dc:format>image/svg+xml</dc:format>
<dc:type
rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
<dc:title></dc:title>
</cc:Work>
</rdf:RDF>
</metadata>
<defs
id="defs6" />
<sodipodi:namedview
pagecolor="#ffffff"
bordercolor="#666666"
borderopacity="1"
objecttolerance="10"
gridtolerance="10"
guidetolerance="10"
inkscape:pageopacity="0"
inkscape:pageshadow="2"
inkscape:window-width="1400"
inkscape:window-height="987"
id="namedview4"
showgrid="true"
showguides="true"
inkscape:guide-bbox="true"
inkscape:zoom="11.8"
inkscape:cx="17.033898"
inkscape:cy="20"
inkscape:window-x="-8"
inkscape:window-y="-8"
inkscape:window-maximized="1"
inkscape:current-layer="svg2">
<inkscape:grid
type="xygrid"
id="grid815" />
<sodipodi:guide
position="40,5"
orientation="1,0"
id="guide817"
inkscape:locked="false" />
<sodipodi:guide
position="0,5"
orientation="1,0"
id="guide819"
inkscape:locked="false" />
<sodipodi:guide
position="20,12.881356"
orientation="1,0"
id="guide821"
inkscape:locked="false" />
<sodipodi:guide
position="35,0"
orientation="0,1"
id="guide823"
inkscape:locked="false" />
<sodipodi:guide
position="31.864407,20"
orientation="0,1"
id="guide825"
inkscape:locked="false" />
<sodipodi:guide
position="32.372881,40"
orientation="0,1"
id="guide827"
inkscape:locked="false" />
</sodipodi:namedview>
<circle
style="fill:none;fill-opacity:1;stroke:#00e700;stroke-width:2;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
id="path829"
cx="20"
cy="20"
r="18.135593" />
</svg>文件大小2.5кB和94服务代码行Inkscape
如何优化代码、删除矢量编辑器的所有冗余服务信息、减少小数位数等。