{"id":25991,"date":"2022-12-14T21:29:58","date_gmt":"2022-12-14T15:59:58","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-expanding-the-inline-python-code-closed\/"},"modified":"2022-12-14T21:29:58","modified_gmt":"2022-12-14T15:59:58","slug":"solved-expanding-the-inline-python-code-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-expanding-the-inline-python-code-closed\/","title":{"rendered":"[Solved] Expanding the inline python code [closed]"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-25184165\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"25184165\" data-parentid=\"25183772\" data-score=\"0\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>First the final answer, which is really a one-liner. Some explanations follow<\/p>\n<pre><code>a = [88, 24, 128, 3]\n[i + 1 for i, x in enumerate(\"\".join(bin(n + 256)[3:] for n in a)) if x == \"1\"]\n<\/code><\/pre>\n<p>This yields<\/p>\n<pre><code>[2, 4, 5, 12, 13, 17, 31, 32]\n<\/code><\/pre>\n<hr>\n<p>First transformation:<\/p>\n<pre><code>def dec2bin(a):\n    return [int(x) for x in \"\".join(bin(n + 256)[3:] for n in a)]\n<\/code><\/pre>\n<p>On your example<\/p>\n<pre><code>&gt;&gt;&gt; dec2bin([88, 24, 128, 3])\n[0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1]\n<\/code><\/pre>\n<p>Then to get positions<\/p>\n<pre><code>def positions(a):\n    return [i for i in range(len(a)) if a[i] == 1]\n<\/code><\/pre>\n<p>The final output<\/p>\n<pre><code>&gt;&gt;&gt; positions(dec2bin([88, 24, 128, 3]))\n[1, 3, 4, 11, 12, 16, 30, 31]\n<\/code><\/pre>\n<p>Notice the values are off by 1, since Python arrays start at 0. To get your values, simply add 1 to the output values:<\/p>\n<pre><code>def positions(a):\n    return [i + 1 for i in range(len(a)) if a[i] == 1]\n<\/code><\/pre>\n<p>If you really need them in hex (they will be strings, not numbers, since numbers have no intrinsic base):<\/p>\n<pre><code>&gt;&gt;&gt; list(map(hex, _))\n['0x1', '0x3', '0x4', '0xb', '0xc', '0x10', '0x1e', '0x1f']\n<\/code><\/pre>\n<p>The whole thing in one line<\/p>\n<pre><code>&gt;&gt;&gt; v = [88, 24, 128, 3]\n&gt;&gt;&gt; (lambda a: [i + 1 for i in range(len(a)) if a[i] == 1])([int(x) for x in \"\".join(bin(n + 256)[3:] for n in v)])\n[2, 4, 5, 12, 13, 17, 31, 32]\n<\/code><\/pre>\n<p>The lambda is not necessary, you can write this instead, using enumerate. And you can make the line shorter by removing the &#8220;int(x)&#8221; step:<\/p>\n<pre><code>&gt;&gt;&gt; v = [88, 24, 128, 3]\n&gt;&gt;&gt; [i + 1 for i, x in enumerate(\"\".join(bin(n + 256)[3:] for n in v)) if x == \"1\"]\n[2, 4, 5, 12, 13, 17, 31, 32]\n<\/code><\/pre>\n<p>Notice the argument of enumerate is a generator, not a list. Same remark for the argument of join.<\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">0<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Expanding the inline python code [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] First the final answer, which is really a one-liner. Some explanations follow a = [88, 24, 128, 3] [i + 1 for i, x in enumerate(&#8220;&#8221;.join(bin(n + 256)[3:] for n in a)) if x == &#8220;1&#8221;] This yields [2, 4, 5, 12, 13, 17, 31, 32] First transformation: def dec2bin(a): return [int(x) for x &#8230; <a title=\"[Solved] Expanding the inline python code [closed]\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-expanding-the-inline-python-code-closed\/\" aria-label=\"More on [Solved] Expanding the inline python code [closed]\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[349],"class_list":["post-25991","post","type-post","status-publish","format-standard","hentry","category-solved","tag-python"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Expanding the inline python code [closed] - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-expanding-the-inline-python-code-closed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Expanding the inline python code [closed] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] First the final answer, which is really a one-liner. Some explanations follow a = [88, 24, 128, 3] [i + 1 for i, x in enumerate(&quot;&quot;.join(bin(n + 256)[3:] for n in a)) if x == &quot;1&quot;] This yields [2, 4, 5, 12, 13, 17, 31, 32] First transformation: def dec2bin(a): return [int(x) for x ... 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