{"id":215,"date":"2026-05-14T18:33:13","date_gmt":"2026-05-14T10:33:13","guid":{"rendered":"https:\/\/junai.ai\/blog\/python-types-variables-3\/"},"modified":"2026-05-17T07:31:11","modified_gmt":"2026-05-16T23:31:11","slug":"python-types-variables-3","status":"publish","type":"post","link":"https:\/\/junai.ai\/blog\/python-types-variables-3\/","title":{"rendered":"\ud30c\uc774\uc36c \ubcc0\uc218\uc640 \uc790\ub8cc\ud615 \u2014 str\u00b7int\u00b7float\u00b7bool (3\ud3b8)"},"content":{"rendered":"\n<!-- WordPress REST API \ubc1c\ud589\uc6a9 HTML (\uc790\ub3d9 \uc0dd\uc131) -->\n<!-- WP-FEATURED-MEDIA-ID: 582 -->\n<div style=\"max-width:800px;margin:0 auto;\">\n<style>\n\/* js-textbook \u2014 PostgreSQL \uad50\uc7ac \ub3d9\uc77c \ud314\ub808\ud2b8 *\/\n:root {\n  --color-primary: #336791;\n  --color-accent: #60a5fa;\n  --color-bg: #fafafa;\n  --color-bg-card: #ffffff;\n  --color-text: #1e293b;\n  --color-text-muted: #64748b;\n  --hero-start: #0f172a;\n  --hero-end: #336791;\n  --font-body: -apple-system, BlinkMacSystemFont, 'Apple SD Gothic Neo', 'Noto Sans KR', sans-serif;\n  --size-body: 17px;\n  --line-height: 1.75;\n}\n* { box-sizing: border-box; }\n.container { max-width: 760px; margin: 0 auto; padding: 0 22px 80px; }\n.hero { background: linear-gradient(135deg, var(--hero-start) 0%, var(--hero-end) 100%); color: #fff; padding: 72px 22px 56px; text-align: center; }\n.hero .badge { display: inline-block; background: rgba(96,165,250,0.18); color: var(--color-accent); padding: 6px 14px; border-radius: 999px; font-size: 13px; font-weight: 600; letter-spacing: 0.5px; margin-bottom: 18px; }\n.hero h1 { margin: 0 0 18px; font-size: 36px; line-height: 1.3; letter-spacing: -0.3px; }\n.hero p.sub { margin: 0 auto; max-width: 580px; font-size: 17px; color: #bfdbfe; }\n.hero img { width: 100%; max-width: 720px; height: auto; margin: 36px auto 0; display: block; border-radius: 10px; box-shadow: 0 8px 32px rgba(0,0,0,0.3); }\n.meta { display: flex; gap: 14px; justify-content: center; margin-top: 20px; font-size: 13px; color: #93c5fd; flex-wrap: wrap; }\n.meta span::before { content: \"\u00b7\"; margin-right: 14px; color: #1e3a8a; }\n.meta span:first-child::before { content: \"\"; margin: 0; }\narticle { background: var(--color-bg-card); margin-top: -36px; padding: 44px 28px; border-radius: 14px; box-shadow: 0 2px 18px rgba(0,0,0,0.06); }\narticle p { margin: 0 0 18px; }\nh2 { font-size: 28px; line-height: 1.35; letter-spacing: -0.3px; margin: 48px 0 18px; padding-bottom: 10px; border-bottom: 2px solid var(--color-primary); }\nh2:first-of-type { margin-top: 8px; }\nh3 { font-size: 21px; line-height: 1.4; margin: 30px 0 12px; color: var(--color-primary); }\ncode { background: #f1f5f9; color: #0f172a; padding: 2px 6px; border-radius: 4px; font-family: 'SFMono-Regular', Menlo, Consolas, monospace; font-size: 0.92em; }\npre { background: #0f172a; color: #e2e8f0; padding: 18px 20px; border-radius: 10px; overflow-x: auto; font-size: 14.5px; line-height: 1.65; margin: 18px 0; }\npre code { background: transparent; color: inherit; padding: 0; }\nul, ol { margin: 0 0 18px; padding-left: 24px; }\nli { margin-bottom: 8px; }\nstrong { color: #0f172a; }\n.databox { background: #eff6ff; border-left: 4px solid var(--color-primary); padding: 18px 20px; border-radius: 6px; margin: 22px 0; }\n.databox p { margin: 0 0 8px; }\n.databox p:last-child { margin: 0; }\n.databox strong { color: var(--color-primary); }\n.warnbox { background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%); border-left: 4px solid #d97706; padding: 18px 20px; border-radius: 6px; margin: 22px 0; }\n.warnbox strong { color: #92400e; }\n.tablewrap { overflow-x: auto; -webkit-overflow-scrolling: touch; margin: 22px 0; }\ntable { width: 100%; border-collapse: collapse; font-size: 15px; background: var(--color-bg-card); }\nth, td { padding: 11px 12px; text-align: left; border-bottom: 1px solid #e2e8f0; vertical-align: top; }\nth { background: #f1f5f9; font-weight: 700; color: #0f172a; }\ntd:first-child, th:first-child { font-weight: 700; }\n.cta { background: linear-gradient(135deg, #336791 0%, #60a5fa 100%); color: #fff; padding: 30px 24px; border-radius: 12px; margin-top: 44px; text-align: center; }\n.cta h3 { color: #fff; margin: 0 0 10px; }\n.cta p { margin: 0; color: #dbeafe; }\n.series-nav { background: #eff6ff; padding: 18px 22px; border-radius: 10px; margin-top: 24px; font-size: 14.5px; color: var(--color-text-muted); }\n.series-nav strong { color: var(--color-primary); }\n@media (max-width: 480px) {\n  .hero { padding: 52px 18px 44px; }\n  .hero h1 { font-size: 26px; }\n  .hero p.sub { font-size: 15px; }\n  article { padding: 28px 18px; border-radius: 10px; }\n  h2 { font-size: 22px; }\n  h3 { font-size: 18px; }\npre { font-size: 13px; padding: 14px 16px; }\n}\n@media (max-width: 560px) {\n  .tablewrap table, .tablewrap thead, .tablewrap tbody, .tablewrap tr, .tablewrap th, .tablewrap td { display: block; width: auto; }\n  .tablewrap thead { display: none; }\n  .tablewrap tr { margin: 0 0 14px; border: 1px solid #e2e8f0; border-radius: 10px; overflow: hidden; }\n  .tablewrap td { border: none; border-bottom: 1px solid #f1f5f9; padding: 9px 14px; }\n  .tablewrap td:first-child { background: #eff6ff; font-weight: 800; font-size: 15.5px; }\n  .tablewrap td:last-child { border-bottom: none; }\n  .tablewrap td[data-label]::before { content: attr(data-label) \" \u2014 \"; font-weight: 700; color: var(--color-primary); }\n}\n<\/style>\n<header class=\"hero\">\n  <span class=\"badge\">\ud30c\uc774\uc36c \uad50\uc7ac \u00b7 3\ud3b8 \/ 27\ud3b8<\/span>\n  <h1>\ud30c\uc774\uc36c \ubcc0\uc218\uc640 \uc790\ub8cc\ud615 \u2014 str\u00b7int\u00b7float\u00b7bool<\/h1>\n  <p class=\"sub\">\uc0c1\uc790\uc5d0 \ubb34\uc5c7\uc744 \ub2f4\ub290\ub0d0\uac00 \ub3d9\uc791 \uc804\uccb4\ub97c \uacb0\uc815\ud569\ub2c8\ub2e4. 4\uac00\uc9c0 \uae30\ubcf8\ud615 + \ubcc0\ud658 + \ubd80\ub3d9\uc18c\uc218\uc810 \ud568\uc815.<\/p>\n  <div class=\"meta\"><span>\uc785\ubb38<\/span><span>\uc77d\ub294 \uc2dc\uac04 7\ubd84<\/span><span>2026-05-13<\/span><\/div>\n  <img decoding=\"async\" src=\"https:\/\/junai.ai\/blog\/wp-content\/uploads\/2026\/05\/hero-201.jpg\" alt=\"\ud30c\uc774\uc36c REPL \uc5d0\uc11c str\u00b7int\u00b7float\u00b7bool \ubcc0\uc218\ub97c \uc120\uc5b8\ud558\uace0 type \uc73c\ub85c \ud655\uc778\ud558\ub294 \ud654\uba74\">\n<\/header>\n\n<div class=\"container\">\n<article>\n\n<p>2\ud3b8 \ub9c8\uc9c0\ub9c9 \ubbf8\uc158 \ub450 \ubc88\uc9f8 \u2014 <em>&#8220;\uc774\ub984\uacfc \ub098\uc774\ub97c \uc785\ub825\ubc1b\uc544 \ub0b4\ub144 \ub098\uc774 \ucd9c\ub825&#8221;<\/em> \u2014 \uc5d0\uc11c \ub9c9\ud78c \ubd84\uc774 \ub9ce\uc744 \uac81\ub2c8\ub2e4. <code>age + 1<\/code> \uc5d0\uc11c <em>TypeError<\/em>. \uc6d0\uc778\uc740 <strong>\uc790\ub8cc\ud615<\/strong>\uc785\ub2c8\ub2e4. <code>input()<\/code> \uc774 \ub3cc\ub824\uc900 <code>\"30\"<\/code> \uc740 \uae00\uc790\ub77c\uc11c, \uc22b\uc790 <code>1<\/code> \uc744 \ub354\ud560 \uc218 \uc5c6\uac70\ub4e0\uc694. \uc790\ub8cc\ud615\uc740 <strong>&#8220;\uc0c1\uc790\uc5d0 \ub2f4\uae34 \uac8c \uae00\uc790\uc778\uc9c0 \uc22b\uc790\uc778\uc9c0 \ucc38\/\uac70\uc9d3\uc778\uc9c0&#8221;<\/strong> \ub97c \ud30c\uc774\uc36c\uc5d0\uac8c \uc54c\ub9ac\ub294 \ub77c\ubca8. \uc798\ubabb \ub4e4\uba74 \uac19\uc740 \ubcc0\uc218\ub3c4 \ub2e4\ub974\uac8c \ub3d9\uc791\ud569\ub2c8\ub2e4.<\/p>\n\n<p>\uc774 \uae00\uc774 \ub05d\ub098\uba74 \u2460 str\u00b7int\u00b7float\u00b7bool \ub124 \uac00\uc9c0\ub97c \uad6c\ubd84\ud558\uace0 \u2461 <code>type()<\/code> \uc73c\ub85c \ud655\uc778\ud558\uba70 \u2462 \ud544\uc694\ud560 \ub54c \ubcc0\ud658\ud558\uace0 \u2463 \ubd80\ub3d9\uc18c\uc218\uc810\uc774 \uc65c 0.1+0.2 \ub97c 0.3 \uc774 \uc544\ub2c8\ub77c 0.30000000000000004 \ub85c \ub9cc\ub4dc\ub294\uc9c0 \uc555\ub2c8\ub2e4.<\/p>\n\n<h2>\ub124 \uac00\uc9c0 \uae30\ubcf8 \uc790\ub8cc\ud615<\/h2>\n\n<p>\ud30c\uc774\uc36c\uc5d0\ub294 \uc790\ub8cc\ud615\uc774 \ub9ce\uc9c0\ub9cc \uc785\ubb38 4\uc8fc\ub294 \uc774 \ub137\uc774\uba74 \ub429\ub2c8\ub2e4. \ub098\uba38\uc9c0\ub294 \uc774 \ub137\uc758 \uc751\uc6a9\uc774\uc5d0\uc694.<\/p>\n\n<div class=\"tablewrap\">\n<table>\n  <thead>\n    <tr><th>\uc790\ub8cc\ud615<\/th><th>\uc57d\uc790<\/th><th>\uc608\uc2dc<\/th><th>\uc8fc\ub85c \ub2f4\ub294 \uac83<\/th><\/tr>\n  <\/thead>\n  <tbody>\n    <tr><td>\ubb38\uc790\uc5f4<\/td><td data-label=\"\uc57d\uc790\"><code>str<\/code><\/td><td data-label=\"\uc608\uc2dc\"><code>\"\uc548\ub155\"<\/code>, <code>'30'<\/code><\/td><td data-label=\"\uc8fc\ub85c \ub2f4\ub294 \uac83\">\uae00\uc790\u00b7\ud14d\uc2a4\ud2b8\u00b7\uc774\ub984\u00b7\uba54\uc2dc\uc9c0<\/td><\/tr>\n    <tr><td>\uc815\uc218<\/td><td data-label=\"\uc57d\uc790\"><code>int<\/code><\/td><td data-label=\"\uc608\uc2dc\"><code>30<\/code>, <code>-7<\/code>, <code>0<\/code><\/td><td data-label=\"\uc8fc\ub85c \ub2f4\ub294 \uac83\">\uac1c\uc218\u00b7\ub098\uc774\u00b7\uc778\ub371\uc2a4\u00b7\uce74\uc6b4\ud2b8<\/td><\/tr>\n    <tr><td>\uc2e4\uc218<\/td><td data-label=\"\uc57d\uc790\"><code>float<\/code><\/td><td data-label=\"\uc608\uc2dc\"><code>1.75<\/code>, <code>3.14<\/code>, <code>-0.5<\/code><\/td><td data-label=\"\uc8fc\ub85c \ub2f4\ub294 \uac83\">\ud0a4\u00b7\uc628\ub3c4\u00b7\ud655\ub960\u00b7\ube44\uc728<\/td><\/tr>\n    <tr><td>\ucc38\/\uac70\uc9d3<\/td><td data-label=\"\uc57d\uc790\"><code>bool<\/code><\/td><td data-label=\"\uc608\uc2dc\"><code>True<\/code>, <code>False<\/code><\/td><td data-label=\"\uc8fc\ub85c \ub2f4\ub294 \uac83\">\uc870\uac74\u00b7\ud50c\ub798\uadf8\u00b7on\/off<\/td><\/tr>\n  <\/tbody>\n<\/table>\n<\/div>\n\n<p>\uc911\uc694\ud55c \uad6c\ubd84 \u2014 <strong>\ub530\uc634\ud45c\uac00 \uc788\ub290\ub0d0<\/strong>. \ub530\uc634\ud45c\ub85c \uac10\uc2f8\uc9c4 <code>\"30\"<\/code> \uc740 \ubb38\uc790\uc5f4, \uadf8\ub0e5 <code>30<\/code> \uc740 \uc815\uc218\uc785\ub2c8\ub2e4. \uac19\uc740 30\uc774\ub77c\ub3c4 \ud30c\uc774\uc36c\uc5d0\uac8c\ub294 \uc804\ud600 \ub2e4\ub978 \uc874\uc7ac\uc608\uc694.<\/p>\n\n<pre><code>name   = \"\uc900\uc131\"     # str \u2014 \ub530\uc634\ud45c \uc788\uc74c\nage    = 30        # int \u2014 \ub530\uc634\ud45c \uc5c6\uc74c\nrate   = 1.75      # float \u2014 \uc810\uc774 \uc788\uc73c\uba74 \uc790\ub3d9 float\nactive = True      # bool \u2014 \ub300\ubb38\uc790 \uc2dc\uc791, \ub530\uc634\ud45c \uc5c6\uc74c<\/code><\/pre>\n\n<p><code>bool<\/code> \uc758 <code>True<\/code>\u00b7<code>False<\/code> \ub294 \ubc18\ub4dc\uc2dc <strong>\ub300\ubb38\uc790 \uc2dc\uc791<\/strong>. <code>true<\/code> \ub294 NameError. \uc790\ubc14\uc2a4\ud06c\ub9bd\ud2b8\uc5d0\uc11c \uc628 \ubd84\ub4e4\uc774 \uc790\uc8fc \ud2c0\ub9ac\ub294 \uc9c0\uc810\uc785\ub2c8\ub2e4.<\/p>\n\n<h2>type() \uc73c\ub85c \ubb34\uc2a8 \uc790\ub8cc\ud615\uc778\uc9c0 \ud655\uc778<\/h2>\n\n<p>&#8220;\uc774 \ubcc0\uc218\uac00 \uc9c0\uae08 \ubb34\uc2a8 \uc790\ub8cc\ud615\uc774\uc9c0&#8221; \uac00 \ud5f7\uac08\ub9ac\uba74 <code>type()<\/code> \ub0b4\uc7a5 \ud568\uc218\uc5d0 \ub123\uc5b4\ubcf4\uc138\uc694. <code>&lt;class '\ud0c0\uc785'&gt;<\/code> \ud615\ud0dc\ub85c \uc54c\ub824\uc90d\ub2c8\ub2e4.<\/p>\n\n<pre><code>&gt;&gt;&gt; type(\"\uc900\uc131\")\n&lt;class 'str'&gt;\n&gt;&gt;&gt; type(30)\n&lt;class 'int'&gt;\n&gt;&gt;&gt; type(1.75)\n&lt;class 'float'&gt;\n&gt;&gt;&gt; type(True)\n&lt;class 'bool'&gt;\n&gt;&gt;&gt; type(\"30\")        # \ub530\uc634\ud45c \uc788\uc73c\ub2c8 str!\n&lt;class 'str'&gt;<\/code><\/pre>\n\n<p>\ub9c8\uc9c0\ub9c9 \uc904\uc744 \uc798 \ubcf4\uc138\uc694. <code>\"30\"<\/code> \uc740 \uae00\uc790 \ubaa8\uc591\uc77c \ubfd0 \uc790\ub8cc\ud615\uc740 \ubb38\uc790\uc5f4. \uc774\uac8c 2\ud3b8 \ub9c8\uc9c0\ub9c9 \ubbf8\uc158\uc774 \ub9c9\ud78c \uc774\uc720\uc785\ub2c8\ub2e4.<\/p>\n\n<div class=\"databox\">\n  <p><strong>\ud83d\udccc \ud30c\uc774\uc36c\uc740 \ub3d9\uc801 \ud0c0\uc785(dynamic typing) \uc5b8\uc5b4<\/strong><\/p>\n  <p>\uc790\ubc14\u00b7C \ub294 \ubcc0\uc218 \ub9cc\ub4e4 \ub54c <code>int age = 30<\/code> \ucc98\ub7fc \uc790\ub8cc\ud615\uc744 \ubbf8\ub9ac \uc120\uc5b8\ud574\uc57c \ud569\ub2c8\ub2e4. \ud30c\uc774\uc36c\uc740 \uadf8\ub0e5 <code>age = 30<\/code> \u2014 \uac12\uc744 \ubcf4\uace0 \uc54c\uc544\uc11c \uc815\ud574\uc694. \ud3b8\ud558\uc9c0\ub9cc \ud568\uc815\ub3c4 \uac19\uc774 \uc635\ub2c8\ub2e4. \uac19\uc740 <code>age<\/code> \ubcc0\uc218\uac00 \ub2e4\uc74c \uc904\uc5d0\uc11c <code>age = \"\uc11c\ub978\"<\/code> \uc73c\ub85c \uac11\uc790\uae30 \ubb38\uc790\uc5f4\uc774 \ub3fc\ub3c4 \ub9c9\uc9c0 \uc54a\uac70\ub4e0\uc694. 18\ud3b8 &#8220;\ud0c0\uc785 \ud78c\ud2b8&#8221; \uc5d0\uc11c \uc774\uac78 \ubd80\ub4dc\ub7fd\uac8c \uc870\uc774\ub294 \ubc95\uc744 \ubc30\uc6c1\ub2c8\ub2e4.<\/p>\n<\/div>\n\n<h2>\ubcc0\ud658 \u2014 int\u00b7str\u00b7float \ud568\uc218\ub85c \uc790\ub8cc\ud615 \uac08\uc544\ub07c\uc6b0\uae30<\/h2>\n\n<p>\ubcc0\uc218\uc758 \uc790\ub8cc\ud615\uc744 \ubc14\uafb8\ub824\uba74 <strong>\ud574\ub2f9 \uc790\ub8cc\ud615 \uc774\ub984<\/strong>\uc744 \ud568\uc218\ucc98\ub7fc \ud638\ucd9c\ud569\ub2c8\ub2e4. \ub9c8\uce58 \uc0c1\uc790\uc5d0\uc11c \ub0b4\uc6a9\ubb3c\uc744 \uaebc\ub0b4 \ub2e4\ub978 \ub77c\ubca8\uc758 \uc0c1\uc790\ub85c \uc62e\uae30\ub294 \uc148.<\/p>\n\n<pre><code>&gt;&gt;&gt; int(\"30\") + 1        # str \u2192 int \ubcc0\ud658 \ud6c4 \ub354\ud558\uae30\n31\n&gt;&gt;&gt; str(30) + \" years\"   # int \u2192 str \ubcc0\ud658 \ud6c4 \uc774\uc5b4\ubd99\uc774\uae30\n'30 years'\n&gt;&gt;&gt; float(\"3.14\")        # str \u2192 float\n3.14\n&gt;&gt;&gt; int(3.7)             # float \u2192 int (\uc18c\uc218\uc810 \ubc84\ub9bc, \ubc18\uc62c\ub9bc X)\n3\n&gt;&gt;&gt; bool(0), bool(1), bool(\"\")\n(False, True, False)<\/code><\/pre>\n\n<p><code>int(3.7)<\/code> \uc774 4 \uac00 \uc544\ub2c8\ub77c 3 \uc778 \uac8c \ud3ec\uc778\ud2b8. <strong>\ubc84\ub9bc<\/strong>\uc774\uc9c0 \ubc18\uc62c\ub9bc\uc774 \uc544\ub2d9\ub2c8\ub2e4. \ubc18\uc62c\ub9bc\uc740 <code>round(3.7)<\/code> = 4 \ub85c \ubcc4\ub3c4 \ud568\uc218. \uc2dc\ud5d8 \ubb38\uc81c \ub2e8\uace8 \ud568\uc815.<\/p>\n\n<p><code>bool<\/code> \ubcc0\ud658\ub3c4 \uc54c\uc544\ub458 \ub9cc\ud574\uc694. 0\u00b7\ube48 \ubb38\uc790\uc5f4\u00b7\ube48 \ub9ac\uc2a4\ud2b8\ub294 <code>False<\/code>, \uadf8 \uc678\ub294 \ubaa8\ub450 <code>True<\/code>. \uc774\uac78 &#8220;Truthy \/ Falsy&#8221; \ub77c \ubd80\ub974\uace0 7\ud3b8 if \ubb38\uc5d0\uc11c \ubcf8\uaca9\uc801\uc73c\ub85c \uc501\ub2c8\ub2e4.<\/p>\n\n<h3>2\ud3b8 \ubbf8\uc158 \ud574\ubc95<\/h3>\n\n<pre><code>name = input(\"\uc774\ub984: \")\nage  = int(input(\"\ub098\uc774: \"))   # \ud575\uc2ec: int() \ub85c \uac10\uc2f8\uae30\nprint(f\"{name}\ub2d8\uc740 {age}\uc0b4, \ub0b4\ub144\uc5d4 {age + 1}\uc0b4\")<\/code><\/pre>\n\n<p><code>int(input(...))<\/code> \ucc98\ub7fc \ud568\uc218\ub97c \uacb9\uccd0 \ubd80\ub974\ub294 \ud328\ud134\uc744 <strong>\ud568\uc218 \ud569\uc131<\/strong>\uc774\ub77c \ubd80\ub985\ub2c8\ub2e4. \uc548\ucabd\uc774 \uba3c\uc800 \uc2e4\ud589\ub3fc \uacb0\uacfc\ub97c \ubc14\uae65 \ud568\uc218\uc5d0 \ub118\uaca8\uc694. \uc785\ubb38 \ud55c \ub2ec \uc548\uc5d0 \uc790\uc5f0\uc2a4\ub7ec\uc6cc\uc9d1\ub2c8\ub2e4.<\/p>\n\n<h2>\ubd80\ub3d9\uc18c\uc218\uc810\uc758 \ubbf8\uce5c \uc9d3 \u2014 0.1 + 0.2 \u2260 0.3<\/h2>\n\n<p>REPL \uc5d0\uc11c \ub2e4\uc74c\uc744 \uccd0\ubcf4\uc138\uc694. \ucda9\uaca9\uc801\uc778 \uacb0\uacfc\uac00 \ub098\uc635\ub2c8\ub2e4.<\/p>\n\n<pre><code>&gt;&gt;&gt; 0.1 + 0.2\n0.30000000000000004\n&gt;&gt;&gt; 0.1 + 0.2 == 0.3\nFalse<\/code><\/pre>\n\n<p>\ud30c\uc774\uc36c \ubc84\uadf8\uac00 \uc544\ub2d9\ub2c8\ub2e4. \uac70\uc758 \ubaa8\ub4e0 \ud504\ub85c\uadf8\ub798\ubc0d \uc5b8\uc5b4\uac00 \ub611\uac19\uc774 \ub3d9\uc791\ud574\uc694. \uc6d0\uc778\uc740 <strong>\ucef4\ud4e8\ud130\uac00 \uc2e4\uc218\ub97c 2\uc9c4\uc218\ub85c \uc800\uc7a5\ud558\uae30 \ub54c\ubb38<\/strong>\uc785\ub2c8\ub2e4. 0.1 \uac19\uc740 \uc2ed\uc9c4\uc218\ub294 2\uc9c4\uc218\ub85c \uc815\ud655\ud788 \ud45c\ud604\uc774 \uc548 \ub3fc\uc11c, \uc544\uc8fc \uc791\uc740 \uc624\ucc28\uac00 \ub204\uc801\ub429\ub2c8\ub2e4. IEEE 754 \ub77c\ub294 1985\ub144\uc758 \uad6d\uc81c \ud45c\uc900\uc774\ub77c \ubaa8\ub450\uac00 \uac19\uc740 \ud568\uc815\uc744 \uacf5\uc720\ud558\uc8e0.<\/p>\n\n<div class=\"warnbox\">\n  <strong>\u26a0\ufe0f \ub3c8 \uacc4\uc0b0\uc5d0\ub294 float \uc4f0\uc9c0 \ub9c8\uc138\uc694.<\/strong> 100\uc6d0 \ub2e8\uc704\uc5d0\uc11c 1\uc6d0\uc774 \uc5b4\uae0b\ub098\ub294 \uc0ac\uace0\uac00 \uc2e4\uc81c\ub85c \uc77c\uc5b4\ub0a9\ub2c8\ub2e4. \ub3c8\uc740 <code>decimal.Decimal<\/code> \ub610\ub294 <strong>\uc815\uc218 \uc6d0 \ub2e8\uc704<\/strong>(\uc608: \ub9cc\uc6d0\uc744 10000 \uc73c\ub85c \uc800\uc7a5) \ub85c. \uc810\uc218\u00b7\uc628\ub3c4\u00b7\ud655\ub960\ucc98\ub7fc \uc57d\uac04\uc758 \uc624\ucc28\uac00 \uc758\ubbf8 \uc5c6\ub294 \uacf3\uc5d0\ub9cc float.\n<\/div>\n\n<p>\uac19\uc74c \ube44\uad50\uac00 \ud544\uc694\ud558\uba74 <code>abs(a - b) &lt; 1e-9<\/code> \ucc98\ub7fc <strong>\uc624\ucc28 \ud5c8\uc6a9 \ubc94\uc704<\/strong>\ub85c \ube44\uad50\ud558\uc138\uc694. <code>math.isclose(a, b)<\/code> \ub3c4 \uac19\uc740 \uc77c\uc744 \ud569\ub2c8\ub2e4.<\/p>\n\n<h2>\ub9c8\ubb34\ub9ac \u2014 \uc790\ub8cc\ud615\uc740 \ub514\ubc84\uae45\uc758 \uccab \ub2e8\ucd94<\/h2>\n\n<p>\uc5d0\ub7ec\uac00 \ub0ac\uc744 \ub54c \ubcf8\uc778\uc774 \uac00\uc7a5 \uba3c\uc800 \uc758\uc2ec\ud574\uc57c \ud560 \uac8c \uc790\ub8cc\ud615\uc785\ub2c8\ub2e4. <strong>&#8220;\uc774 \ubcc0\uc218\uac00 \uc9c0\uae08 str \uc778\uac00 int \uc778\uac00&#8221;<\/strong> \ub97c <code>print(type(\ubcc0\uc218))<\/code> \ud55c \uc904\ub85c \ucc0d\uc5b4\ubcf4\uba74 70% \uc758 \ubb38\uc81c\uac00 \ud480\ub824\uc694. \ubca0\ud14c\ub791 \uac1c\ubc1c\uc790\ub3c4 \uadf8 \ud55c \uc904\uc744 \uc2dc\ud55c \ud3ed\ud0c4 \ud574\uccb4\ud558\ub4ef \ub9e4\uc77c \uc501\ub2c8\ub2e4.<\/p>\n\n<p>\ub2e4\uc74c \ubbf8\uc158 \u2014 REPL \uc5d0\uc11c \ub2e4\uc74c\uc744 \uc2dc\ub3c4\ud574\ubcf4\uc138\uc694. (1) <code>\"3\" * 3<\/code> \uc758 \uacb0\uacfc \uc608\uce21 \ud6c4 \ud655\uc778 (\ud78c\ud2b8: \ubb38\uc790\uc5f4 \uacf1\ud558\uae30\ub294 \ubc18\ubcf5) (2) <code>3 * \"3\"<\/code> \ub3c4 \uac19\uc740 \uacb0\uacfc\uc778\uac00? (3) <code>True + True<\/code> \uc758 \uacb0\uacfc (\ud78c\ud2b8: bool \uc740 int \uc758 \ubd80\ubd84\uc9d1\ud569).<\/p>\n\n<div class=\"cta\">\n  <h3>\ub2e4\uc74c \ud3b8 \ubbf8\ub9ac\ubcf4\uae30<\/h3>\n  <p>4\ud3b8 \u2014 &#8220;\ud30c\uc774\uc36c \ubb38\uc790\uc5f4 \ub2e4\ub8e8\uae30&#8221;: <code>str<\/code> \uc790\ub8cc\ud615\uc744 \uae4a\uac8c. \uc2ac\ub77c\uc774\uc2f1\u00b7\uac80\uc0c9\u00b7\uce58\ud658\u00b7split\u00b7join \u2014 \ud14d\uc2a4\ud2b8\ub97c \uc790\ub974\uace0 \ubd99\uc774\ub294 \ubaa8\ub4e0 \uae30\uc220.<\/p>\n<\/div>\n\n<div class=\"series-nav\">\n  <strong>\ud83d\udcda 27\ud3b8 \ud30c\uc774\uc36c \uad50\uc7ac \uc2dc\ub9ac\uc988 \u2014 3\/27\ud3b8<\/strong><br>\n  \u2190 2\ud3b8 &#8220;\uccab \ud504\ub85c\uadf8\ub7a8&#8221; \u00b7 \ub2e4\uc74c: 4\ud3b8 &#8220;\ubb38\uc790\uc5f4 \ub2e4\ub8e8\uae30&#8221;\n<\/div>\n\n<\/article>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\ud30c\uc774\uc36c 4\uac00\uc9c0 \uae30\ubcf8 \uc790\ub8cc\ud615(str\u00b7int\u00b7float\u00b7bool), type() \ud655\uc778, int\u2194str \ubcc0\ud658, \ubd80\ub3d9\uc18c\uc218\uc810 \ud568\uc815. 27\ud3b8 \uad50\uc7ac 3\ud3b8.<\/p>\n","protected":false},"author":1,"featured_media":582,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-215","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-python"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/junai.ai\/blog\/wp-json\/wp\/v2\/posts\/215","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/junai.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/junai.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/junai.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/junai.ai\/blog\/wp-json\/wp\/v2\/comments?post=215"}],"version-history":[{"count":1,"href":"https:\/\/junai.ai\/blog\/wp-json\/wp\/v2\/posts\/215\/revisions"}],"predecessor-version":[{"id":609,"href":"https:\/\/junai.ai\/blog\/wp-json\/wp\/v2\/posts\/215\/revisions\/609"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/junai.ai\/blog\/wp-json\/wp\/v2\/media\/582"}],"wp:attachment":[{"href":"https:\/\/junai.ai\/blog\/wp-json\/wp\/v2\/media?parent=215"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/junai.ai\/blog\/wp-json\/wp\/v2\/categories?post=215"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/junai.ai\/blog\/wp-json\/wp\/v2\/tags?post=215"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}