{"id":73255,"date":"2018-09-21T11:48:13","date_gmt":"2018-09-21T02:48:13","guid":{"rendered":"https:\/\/www.sejuku.net\/blog\/?p=73255"},"modified":"2024-05-06T11:52:05","modified_gmt":"2024-05-06T02:52:05","slug":"%e3%80%90python%e5%85%a5%e9%96%80%e3%80%91%e5%b0%8f%e6%95%b0%e7%82%b9%e3%81%ae%e6%93%8d%e4%bd%9c%e3%82%92%e5%88%87%e3%82%8a%e4%b8%8a%e3%81%92%e3%81%8b%e3%82%89round%e3%81%be%e3%81%a7%e5%ae%8c%e5%85%a8","status":"publish","type":"post","link":"https:\/\/www.sejuku.net\/blog\/73255","title":{"rendered":"\u3010Python\u5165\u9580\u3011\u5c0f\u6570\u70b9\u306e\u64cd\u4f5c\u3092\u5207\u308a\u4e0a\u3052\u304b\u3089round\u307e\u3067\u5b8c\u5168\u7406\u89e3\uff01"},"content":{"rendered":"\n<p>\u3053\u3093\u306b\u3061\u306f\uff01\u30d5\u30ea\u30fc\u30e9\u30f3\u30b9\u30a8\u30f3\u30b8\u30cb\u30a2\u30fb\u30e9\u30a4\u30bf\u30fc\u306e\u5e73\u5c71\u3067\u3059\u3002<\/p>\n\n\n\n<p>Python\u3067\u5c0f\u6570\u70b9\u3092\u6271\u3063\u3066\u3044\u308b\u3068\u3001<\/p>\n\n\n\n<p><div class=\"box_voice\">\u56db\u6368\u4e94\u5165\u3063\u3066\u3069\u3046\u3059\u308c\u3070\u3044\u3044\u3093\u3060\u308d\u3046\uff1f<br>\u666e\u901a\u306b\u8a08\u7b97\u3092\u3057\u305f\u306f\u305a\u306a\u306e\u306b\u3001\u7d50\u679c\u304c\u304a\u304b\u3057\u3044\u30fb\u30fb\u30fb<\/div><\/p>\n\n\n\n<p>\u3068\u3044\u3063\u305f\u5834\u9762\u306b\u906d\u9047\u3057\u305f\u3053\u3068\u3082\u3042\u308b\u306e\u3067\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u304b\uff1f\u3000\u5c0f\u6570\u70b9\u306f\u69d8\u3005\u306a\u5834\u9762\u3067\u4f7f\u3046\u306e\u3067\u3001\u7d30\u304b\u3044\u3068\u3053\u308d\u3067\u3082\u5f15\u3063\u304b\u304b\u308b\u3068\u30b9\u30c8\u30ec\u30b9\u3067\u3059\u3088\u306d\u3002<\/p>\n\n\n\n<p>\u305d\u3053\u3067\u3001\u3053\u306e\u8a18\u4e8b\u3067\u306f<br><div class=\"box01\"><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><b>\u5c0f\u6570\u70b9\u306e\u57fa\u790e<\/b><\/li>\n\n\n\n<li><b>\u5c0f\u6570\u70b9\u306e\u64cd\u4f5c\uff08\u5207\u308a\u4e0a\u3052\u3001\u5207\u308a\u6368\u3066\u3001\u56db\u6368\u4e94\u5165\u30fb\u30fb\u30fb\uff09<\/b><\/li>\n<\/ul>\n\n\n<\/div>\n\n\n\n<p>\u3068\u3044\u3063\u305f\u57fa\u672c\u7684\u306a\u5185\u5bb9\u304b\u3089\u3001<br><div class=\"box01\"><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><b>decimal\u30e2\u30b8\u30e5\u30fc\u30eb\u3092\u4f7f\u3063\u305f\u6b63\u78ba\u306a\u8a08\u7b97<\/b><\/li>\n<\/ul>\n\n\n<\/div>\n\n\n\n<p>\u3068\u3044\u3046\u5fdc\u7528\u307e\u3067\u3001\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002\u3053\u308c\u3092\u8aad\u3093\u3067\u5c0f\u6570\u70b9\u3092\u30de\u30b9\u30bf\u30fc\u3057\u307e\u3057\u3087\u3046\uff01<\/p>\n\n\n\n<p>\u672c\u8a18\u4e8b\u3092\u8aad\u3080\u524d\u306b\u3001Python\u304c\u3069\u3093\u306a\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u306a\u306e\u304b\u3092\u304a\u3055\u3089\u3044\u3057\u3066\u304a\u304d\u305f\u3044\u4eba\u306f\u6b21\u306e\u8a18\u4e8b\u3092\u53c2\u8003\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<p>\u2192&nbsp;<a href=\"https:\/\/www.sejuku.net\/blog\/7720\">Python\u3068\u306f\uff1f\u7279\u5fb4\u3084\u3067\u304d\u308b\u3053\u3068\u3001\u6d3b\u7528\u4f8b\u3092\u308f\u304b\u308a\u3084\u3059\u304f\u7c21\u5358\u306b\u89e3\u8aac<\/a><\/p>\n\n\n\n<p>\u306a\u304a\u3001\u305d\u306e\u4ed6\u306ePython\u306e\u8a18\u4e8b\u306b\u3064\u3044\u3066\u306f<a href=\"https:\/\/www.sejuku.net\/blog\/147190\" target=\"_blank\" rel=\"noopener\">\u3053\u3061\u3089<\/a>\u306b\u307e\u3068\u3081\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5c0f\u6570\u70b9\uff08float\u578b\uff09\u306e\u57fa\u790e<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"700\" height=\"525\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/09\/shutterstock_3228088.jpg\" alt=\"\" class=\"wp-image-73272\" srcset=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/09\/shutterstock_3228088.jpg 700w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/09\/shutterstock_3228088-150x113.jpg 150w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/09\/shutterstock_3228088-300x225.jpg 300w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/09\/shutterstock_3228088-640x480.jpg 640w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n<\/div>\n\n\n<p><div class=\"img-caption\">\u753b\u50cf\uff1ashutter stock<\/div><\/p>\n\n\n\n<p>\u307e\u305a\u306f\u3001Python\u306b\u304a\u3051\u308b\u5c0f\u6570\u70b9\u306e\u57fa\u790e\u3092\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002Python\u306f\u6570\u5024\u578b\u3068\u3057\u3066\u3001\u6574\u6570\u578b\u3001\u5c0f\u6570\u578b\u3001\u8907\u7d20\u6570\u578b\u306e3\u3064\u3092\u6301\u3061\u307e\u3059\u3002\u305d\u3057\u3066\u3001\u305d\u308c\u305e\u308c\u306bint\u578b\u3001float\u578b\u3001complex\u578b\u304c\u5bfe\u5fdc\u3057\u307e\u3059\u3002\u3053\u306e3\u3064\u306e\u578b\u3092\u4f7f\u3063\u3066\u6570\u5b57\u3092\u8868\u73fe\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4ed6\u306e\u8a00\u8a9e\u3092\u5b66\u3093\u3060\u7d4c\u9a13\u306e\u3042\u308b\u304b\u305f\u306b\u306f\u300c\u500d\u7cbe\u5ea6\u5c0f\u6570\u70b9\u306f\uff1f\u300d\u3068\u601d\u308f\u308c\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002\u500d\u7cbe\u5ea6\u5c0f\u6570\u70b9\u306b\u95a2\u3057\u3066\u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u500d\u7cbe\u5ea6\u3068\u540c\u7b49\u306e\u7cbe\u5ea6\u3092\u6301\u3063\u3066\u3044\u308b\u306e\u3067\u3054\u5b89\u5fc3\u304f\u3060\u3055\u3044\u3002Python\u521d\u5b66\u8005\u306e\u65b9\u3084\u30b9\u30af\u30ea\u30d7\u30c8\u8a00\u8a9e\u3057\u304b\u7d4c\u9a13\u306e\u306a\u3044\u65b9\u306b\u3068\u3063\u3066\u306f\u300c\u578b\u300d\u3068\u3044\u3046\u6982\u5ff5\u81ea\u4f53\u3001\u3042\u307e\u308a\u99b4\u67d3\u307f\u304c\u306a\u3044\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p>\u578b\u3068\u306f\u3001<strong>\u5909\u6570\u306b\u4ee3\u5165\u3067\u304d\u308b\u3082\u306e\u3092\u5236\u9650\u3059\u308b\u898f\u5247<\/strong>\u3067\u3059\u3002\u6d6e\u52d5\u5c0f\u6570\u70b9\u578b\u306b\u306f\u6d6e\u52d5\u5c0f\u6570\u70b9\u4ee5\u5916\u4ee3\u5165\u3067\u304d\u306a\u3044\u3001\u3068\u3044\u3046\u611f\u3058\u3067\u3059\u306d\u3002\u666e\u6bb5\u306fPython\u304c\u81ea\u52d5\u7684\u306b\u5909\u6570\u306e\u578b\u3092\u5224\u5225\u3057\u3066\u304f\u308c\u308b\u305f\u3081\u3001\u3042\u307e\u308a\u610f\u8b58\u3057\u306a\u3044\u3067\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3092\u3057\u3066\u3044\u308b\u65b9\u3082\u591a\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p>\u3067\u3059\u304c\u3001\u578b\u304c\u5408\u308f\u306a\u304f\u3066\u5909\u306a\u30a8\u30e9\u30fc\u304c\u51fa\u305f\u3001\u3068\u3044\u3046\u306e\u306f\u3042\u308a\u304c\u3061\u306a\u30cf\u30de\u308a\u30cd\u30bf\u3067\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u578b\u306b\u5bfe\u3059\u308b\u7406\u89e3\u3092\u304d\u3061\u3093\u3068\u6301\u3063\u3066\u304a\u304f\u4e8b\u306f\u610f\u5916\u3068\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u4eca\u56de\u306ffloat\u578b\u306b\u3064\u3044\u3066\u306e\u307f\u3067\u3059\u304c\u3001\u3053\u308c\u3092\u6a5f\u306b\u578b\u306b\u3064\u3044\u3066\u610f\u8b58\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u305d\u308c\u3067\u306f\u7d9a\u3044\u3066\u5c0f\u6570\u70b9\u306e\u5b9f\u969b\u306e\u64cd\u4f5c\u3092\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5c0f\u6570\u70b9\u6570\u306e\u64cd\u4f5c<\/h2>\n\n\n\n<p>\u3053\u3053\u304b\u3089\u306fPython\u3067\u306e\u5b9f\u969b\u306e\u5c0f\u6570\u70b9\u306e\u64cd\u4f5c\u3092\u30bd\u30fc\u30b9\u3068\u3068\u3082\u306b\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5207\u308a\u4e0a\u3052<\/h3>\n\n\n\n<p>\u307e\u305a\u306f\u3001\u5207\u308a\u4e0a\u3052\u3067\u3059\u3002\u5207\u308a\u4e0a\u3052\u306b\u306fmath\u30e2\u30b8\u30e5\u30fc\u30eb\u306eceil()\u3092\u4f7f\u3044\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u4f8b\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">import math\n\nfloat_var = 1.234\nprint(math.ceil(float_var))\n# \u7d50\u679c\n2\n<\/pre>\n\n\n\n<p>\u4efb\u610f\u6841\u3067\u306e\u5207\u308a\u4e0a\u3052\u306b\u306fdecimal\u30e2\u30b8\u30e5\u30fc\u30eb\u304c\u5fc5\u8981\u3068\u306a\u308a\u307e\u3059\u3002decimal\u30e2\u30b8\u30e5\u30fc\u30eb\u306f3\u7ae0\u3067\u8a73\u3057\u304f\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5207\u308a\u6368\u3066<\/h3>\n\n\n\n<p>\u7d9a\u3044\u3066\u5207\u308a\u6368\u3066\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u5207\u308a\u4e0a\u3052\u3068\u540c\u69d8\u306b\u3001<strong>math\u30e2\u30b8\u30e5\u30fc\u30eb\u5185\u306bfloor\u3068\u3044\u3046\u30e1\u30bd\u30c3\u30c9\u304c\u7528\u610f<\/strong>\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">import math\n\nfloat_var = 1.234\nprint(math.floor(float_var))\n# \u7d50\u679c\n1<\/pre>\n\n\n\n<p>\u307e\u305f\u3001\u5272\u308a\u7b97\u306b\u3088\u3063\u3066float\u578b\u304c\u751f\u6210\u3055\u308c\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u6642\u306f\u3001\u6b21\u306e\u3088\u3046\u306b\u6f14\u7b97\u5b50\u3092\u5de5\u592b\u3059\u308b\u4e8b\u3067\u5207\u308a\u4e0a\u3052\u3068\u4f3c\u305f\u3088\u3046\u306a\u52b9\u679c\u304c\u5f97\u3089\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">int_var1 = 8\nint_var2 = 5\n\nfloat_answer = int_var1\/int_var2\nint_answer = int_var1\/\/int_var2\n\nprint(float_answer)\nprint(int_answer)\n\n# \u7d50\u679c\n1.6\n1\n<\/pre>\n\n\n\n<p>\u3053\u3061\u3089\u306f\u4f55\u3092\u3057\u3066\u3044\u308b\u306e\u304b\u3068\u3044\u3046\u3068\u3001\u5272\u308a\u7b97\u306e\u5546\u3001\u3064\u307e\u308a\u6574\u6570\u90e8\u5206\u306e\u307f\u3092\u8fd4\u3059\u3001\u3068\u3044\u3046\u6f14\u7b97\u3092\u3057\u3066\u3044\u307e\u3059\u3002\u4ed6\u8a00\u8a9e\u3067\u306f\u5225\u9014\u30e1\u30bd\u30c3\u30c9\u3092\u7528\u610f\u3057\u3066\u5bfe\u5fdc\u3059\u308b\u3053\u3068\u304c\u591a\u3044\u6f14\u7b97\u3067\u3059\u304c\u3001Python\u3067\u306f\u7d44\u307f\u8fbc\u307f\u306e\u6f14\u7b97\u5b50\u306e\u307f\u3067\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u899a\u3048\u3066\u304a\u304f\u3068\u306a\u304b\u306a\u304b\u4fbf\u5229\u306a\u6a5f\u80fd\u3067\u3059\u306d\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u56db\u6368\u4e94\u5165<\/h3>\n\n\n\n<p>\u3064\u304e\u306f\u56db\u6368\u4e94\u5165\u3067\u3059\u3002<strong>\u56db\u6368\u4e94\u5165\u306b\u3064\u3044\u3066\u306fPython\u7279\u6709\u306e\u30cf\u30de\u308a\u30dd\u30a4\u30f3\u30c8\u304c\u3042\u308b<\/strong>\u306e\u3067\u3001\u6c17\u3092\u5f15\u304d\u7de0\u3081\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002Python3\u3067\u6b21\u306e\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">float_n = 10.5\nfloat_m = 11.5\n\nprint(round(float_n))\nprint(round(float_m))\n\n# \u7d50\u679c\n10\n12<\/pre>\n\n\n\n<p>\u3069\u3046\u3067\u3057\u3087\u3046\u304b\uff1f\u591a\u304f\u306e\u65b9\u306fround(float_n) = 11 , round(float_m) = 12\u3068\u4e88\u60f3\u3057\u307e\u305b\u3093\u3067\u3057\u305f\u304b\uff1f\u4ed6\u306e\u8a00\u8a9e\u3067round()\u306f\u307b\u307c\u56db\u6368\u4e94\u5165\u3067\u3042\u308b\u305f\u3081\u3001\u4ed6\u8a00\u8a9e\u7d4c\u9a13\u8005\u307b\u3069\u4e0d\u601d\u8b70\u306a\u6c17\u5206\u306b\u306a\u308b\u3053\u3068\u3067\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p>\u5b9f\u306fPython\u306eround()\u306f\u56db\u6368\u4e94\u5165\u3067\u306f\u3042\u308a\u307e\u305b\u3093\uff01\u3000round()\u306f\u5076\u6570\u3078\u306e\u4e38\u3081\u3001\u3068\u3044\u3046\u51e6\u7406\u3092\u3059\u308b\u95a2\u6570\u306a\u306e\u3067\u3059\u3002\u5076\u6570\u3078\u306e\u4e38\u3081\u306e\u5b9a\u7fa9\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u7aef\u6570\u304c0.5\u3088\u308a\u5c0f\u3055\u3044\u306a\u3089\u5207\u308a\u6368\u3066\u3001\u7aef\u6570\u304c0.5\u3088\u308a\u5927\u304d\u3044\u306a\u3089\u306f\u5207\u308a\u4e0a\u3052\u3001\u7aef\u6570\u304c\u3061\u3087\u3046\u30690.5\u306a\u3089\u5207\u308a\u6368\u3066\u3068\u5207\u308a\u4e0a\u3052\u306e\u3046\u3061\u7d50\u679c\u304c\u5076\u6570\u3068\u306a\u308b\u65b9\u3078\u4e38\u3081\u308b\u3002<br><a href=\"https:\/\/ja.wikipedia.org\/wiki\/%E7%AB%AF%E6%95%B0%E5%87%A6%E7%90%86#%E5%81%B6%E6%95%B0%E3%81%B8%E3%81%AE%E4%B8%B8%E3%82%81%EF%BC%88round_to_even%EF%BC%89\">\u51fa\u5178\uff1aWikipedia<\/a><\/p>\n<\/blockquote>\n\n\n\n<p>\u306a\u3093\u3067\u3053\u3093\u306a\u9762\u5012\u306a\u51e6\u7406\u3092\u3057\u3066\u308b\u306e\uff01\uff1f\u3068\u982d\u3092\u62b1\u3048\u305f\u304f\u306a\u308a\u307e\u3059\u3088\u306d\u3002\u3067\u3059\u304c\u3001Python\u516c\u5f0f\u306b\u3088\u308b\u3068<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u3053\u308c\u306f\u30d0\u30b0\u3067\u306f\u3042\u308a\u307e\u305b\u3093: \u3053\u308c\u306f\u307b\u3068\u3093\u3069\u306e\u5c0f\u6570\u304c\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u3067\u6b63\u78ba\u306b\u8868\u305b\u306a\u3044\u3053\u3068\u306e\u7d50\u679c\u3067\u3059\u3002<\/p>\n\n\n\n<p><a href=\"https:\/\/docs.python.jp\/3\/library\/functions.html#round\" target=\"_blank\" rel=\"noopener noreferrer\">https:\/\/docs.python.jp\/3\/library\/functions.html#round&#8221;<\/a><br><a href=\"https:\/\/docs.Python.org\/ja\/3.7\/tutorial\/floatingpoint.html\" target=\"_blank\" rel=\"noopener noreferrer\">https:\/\/docs.Python.org\/ja\/3.7\/tutorial\/floatingpoint.html<\/a><\/p>\n<\/blockquote>\n\n\n\n<p>round()\u306f\u6163\u308c\u308b\u307e\u3067\u306f\u8272\u3005\u3068\u6271\u3044\u306b\u304f\u3044\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002\u3067\u3059\u304c\u3001\u6c17\u697d\u306b\u4efb\u610f\u306e\u6841\u3092\u4e38\u3081\u308b\u3053\u3068\u306e\u3067\u304d\u308b\u7d44\u307f\u8fbc\u307f\u95a2\u6570\u3067\u3082\u3042\u308a\u307e\u3059\u3002\u6841\u3092\u6307\u5b9a\u3057\u3066\u4e38\u3081\u308b\u306b\u306f\u4e0b\u306e\u3088\u3046\u306b\u66f8\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">print(round(1.234,2))\n# &gt;&gt;&gt;1.23<\/pre>\n\n\n<div class=\"box01\">\n\n\n\n<ul class=\"wp-block-list\">\n<li><b>\u7b2c\uff11\u5f15\u6570\u306b\u4e38\u3081\u305f\u3044\u5c0f\u6570<\/b><\/li>\n\n\n\n<li><b>\u7b2c\uff12\u5f15\u6570\u306b\u4e38\u3081\u305f\u3044\u6841<\/b><\/li>\n<\/ul>\n\n\n<\/div>\n\n\n\n<p>\u4e00\u822c\u7684\u306a\u56db\u6368\u4e94\u5165\u3068\u306f\u6319\u52d5\u304c\u7570\u306a\u308b\u3001\u3068\u899a\u3048\u3066\u304a\u3051\u3070\u6c17\u697d\u306b\u6841\u3092\u4e38\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u306d\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u6841\u6570\u306e\u53d6\u5f97<\/h3>\n\n\n\n<p>\u3053\u3093\u3069\u306ffloat\u578b\u306e\u6841\u6570\u3092\u53d6\u5f97\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002float\u306f\u6b8b\u5ff5\u306a\u304c\u3089\u95a2\u6570\u4e00\u3064\u3067\u6841\u6570\u3092\u53d6\u5f97\u3059\u308b\u65b9\u6cd5\u304c\u3042\u308a\u307e\u305b\u3093\u3002\u5272\u308a\u5207\u308c\u306a\u3044\u6570\u304c\u5909\u6570\u306b\u5165\u3063\u3066\u3044\u308b\u3053\u3068\u304c\u3042\u308b\u305f\u3081\u3001\u6841\u6570\u304c\u7121\u9650\u3068\u304b\u304c\u826f\u304f\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305d\u306e\u305f\u3081\u3001\u6841\u6570\u3092\u6c42\u3081\u308b\u95a2\u6570\u304c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u306a\u3044\u3093\u3067\u3059\u306d\u3002\u4ed6\u306e\u578b\u306b\u306f\u4f7f\u3048\u308blen()\u304cfloat\u578b\u306b\u306f\u4f7f\u3048\u307e\u305b\u3093\u3002\u306a\u306e\u3067\u3001float\u578b\u3067\u6841\u6570\u3092\u53d6\u5f97\u3057\u305f\u3044\u5834\u5408\u3001\u4e00\u5de5\u592b\u304c\u5fc5\u8981\u3067\u3059\u3002\u3055\u3063\u305d\u304f\u30bd\u30fc\u30b9\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">float_var = 14.25\nfloat_var -= int(float_var)\nprint(len(str(float_var))-2)<\/pre>\n\n\n\n<p>\u30bd\u30fc\u30b9\u306e\u89e3\u8aac\u3092\u3057\u307e\u3059\u3002<br><div class=\"box01\"><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><b>\u5143\u306e\u6570\u304b\u3089\u6574\u6570\u90e8\u5206\u3092\u53d6\u308a\u9664\u304d\u307e\u3059<\/b><\/li>\n\n\n\n<li><b>float\u3092\u6587\u5b57\u5217\u306b\u5909\u63db\u3057\u307e\u3059<\/b><\/li>\n\n\n\n<li><b>\u6587\u5b57\u5217&#8221;0.25&#8243;\u304b\u30890.\u3092\u53d6\u308a\u9664\u3044\u305f\u6b8b\u308a\u306e\u9577\u3055\u3092\u8868\u793a\u3057\u307e\u3059<\/b><\/li>\n<\/ol>\n\n\n\n<p><\/div><br>\u3053\u308c\u3067\u5c0f\u6570\u70b9\u4ee5\u4e0b\u306e\u6841\u6570\u3092\u6c42\u3081\u3089\u308c\u307e\u3057\u305f\uff01<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">E\u3092\u5c0f\u6570\u70b9\u8868\u793a\u306b\u3057\u305f\u3044<\/h3>\n\n\n\n<p>\u6b21\u306f\u8868\u793a\u306e\u5909\u63db\u65b9\u6cd5\u306b\u3064\u3044\u3066\u5b66\u3073\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p>Python\u306efloat\u578b\u306f<br><div class=\"box01\"><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><b>\u6841\u6570\u304c\u5c0f\u3055\u3044\u6642\u306f\u666e\u901a\u306e\u8868\u8a18<\/b><\/li>\n\n\n\n<li><b>\u6841\u6570\u304c\u5927\u304d\u304f\u306a\u308b\u3068\u6307\u6570\u8868\u8a18<\/b><\/li>\n<\/ul>\n\n\n<\/div>\n\n\n\n<p>\u3068\u81ea\u52d5\u3067\u5207\u308a\u66ff\u308f\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u3067\u3059\u304c\u3001\u51e6\u7406\u3084\u898b\u305f\u76ee\u306e\u554f\u984c\u3067\u6307\u6570\u8868\u793a\u3057\u305f\u304f\u306a\u3044\u5834\u5408\u3082\u3042\u308a\u307e\u3059\u3002\u305d\u3093\u306a\u6642\u306b\u4f7f\u3048\u308b\u306e\u304c\u7d44\u307f\u8fbc\u307f\u95a2\u6570\u306eformat()\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">float = 1.23e+16\nprint(format(float, \"f\"))<\/pre>\n\n\n\n<p>\u4f7f\u3044\u65b9\u306f\u7b2c1\u5f15\u6570\u306b\u5909\u63db\u3057\u305f\u3044\u6570\u3001\u7b2c2\u5f15\u6570\u306b\u6587\u5b57\u5217\u306ef\u3092\u5165\u308c\u308b\u3060\u3051\u3067\u3059\u3002\u9006\u306b\u9577\u3044\u5c0f\u6570\u3092\u6307\u6570\u8868\u793a\u3057\u305f\u3044\u5834\u5408\u306f\u7b2c2\u5f15\u6570\u3092e\u306b\u5909\u3048\u308c\u3070\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>format()\u306f\u4ed6\u306b\u3082\u305f\u304f\u3055\u3093\u306e\u4f7f\u3044\u65b9\u304c\u3042\u308a\u307e\u3059\u3002\u6c17\u306b\u306a\u308b\u65b9\u306f\u3053\u3061\u3089\u306e\u8a18\u4e8b\u3082\u30c1\u30a7\u30c3\u30af\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<br>            <a href=\"https:\/\/www.sejuku.net\/blog\/22481\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/05\/python_format1-150x85.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010Python\u3011format\u30e1\u30bd\u30c3\u30c9\u3068\u306f\uff1f\u57fa\u672c + \u5fdc\u7528\u3092\u307e\u3068\u3081\u3066\u89e3\u8aac\uff01<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            <br>\u6b21\u306e\u7ae0\u3067\u306f\u3001\u5c0f\u6570\u3092\u6271\u3063\u3066\u3044\u308b\u3068\u304d\u306b\u906d\u9047\u3057\u3084\u3059\u3044\u554f\u984c\u3092\u89e3\u6c7a\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5c0f\u6570\uff08float\u578b\uff09\u306b\u307e\u3064\u308f\u308b\u554f\u984c<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u8db3\u3057\u7b97\u3057\u305f\u3089\u304a\u304b\u3057\u3044<\/h3>\n\n\n\n<p>\u3053\u3053\u304b\u3089\u306fPython\u306e\u5c0f\u6570\u306b\u307e\u3064\u308f\u308b\u826f\u304f\u3042\u308b\u554f\u984c\u306b\u7126\u70b9\u3092\u5f53\u3066\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002\u307e\u305a\u3001\u6b21\u306e\u30bd\u30fc\u30b9\u3092\u5b9f\u884c\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">print(0.1+0.1+0.1)\n# &gt;&gt;&gt;0.30000000000000004<\/pre>\n\n\n\n<p>\u7b97\u6570\u7684\u306b\u306f\u3069\u3046\u307f\u3066\u3082\u304a\u304b\u3057\u3044\u3067\u3059\u3088\u306d\u3002\u3067\u3059\u304c\u3001\u3053\u306e\u554f\u984c\u306ffloat\u304c\u5185\u90e8\u30672\u9032\u6570\u3092\u4f7f\u3063\u3066\u3044\u308b\u4ee5\u4e0a\u3001\u5b9f\u306f\u3069\u3046\u3057\u3088\u3046\u3082\u306a\u3044\u3093\u3067\u3059\u3002\u8aa4\u5dee\u3068\u3057\u3066\u30821\u4eac\u5206\u306e1\u7a0b\u5ea6\u306a\u306e\u3067\u3001\u591a\u304f\u306e\u5834\u5408\u3001\u5b9f\u7528\u4e0a\u306f\u554f\u984c\u306a\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p>\u3069\u3046\u3057\u3066\u3082\u8aa4\u5dee\u306e\u767a\u751f\u304c\u8a31\u3055\u308c\u306a\u3044\u5834\u5408\u3001\u6b21\u7ae0\u3067\u7d39\u4ecb\u3059\u308bdecimal\u30e2\u30b8\u30e5\u30fc\u30eb\u3092\u4f7f\u3044\u307e\u3059\u3002\u3082\u3057\u304f\u306f\u3001\u6b21\u306e\u30bd\u30fc\u30b9\u306e\u3088\u3046\u306b\u5fc5\u8981\u306a\u6841\u6570\u3067\u4e38\u3081\u3066\u3057\u307e\u3046\u306e\u3082\u30a2\u30ea\u3067\u3059\u306d\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">print(round(0.1+0.1+0.1,3))\n# &gt;&gt;&gt;0.3<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">int\u578b\u306b\u5909\u63db\u3059\u308b\u306b\u306f\uff1f<\/h3>\n\n\n\n<p>\u7d9a\u3044\u3066\u578b\u5909\u63db\u306b\u3064\u3044\u3066\u3067\u3059\u3002\u5c0f\u6570\u3092\u6574\u6570\u578b\u306b\u5909\u63db\u3059\u308b\u306b\u306fint()\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">float_var=1.234\nint_var = int(float_var)\nprint(int_var)<\/pre>\n\n\n\n<p>\u307e\u305f\u3001\u524d\u7ae0\u3067\u7d39\u4ecb\u3057\u305f<br><div class=\"box01\"><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><b>\u5207\u308a\u4e0a\u3052<\/b><\/li>\n\n\n\n<li><b>\u5207\u308a\u6368\u3066<\/b><\/li>\n\n\n\n<li><b>round()<\/b><\/li>\n<\/ul>\n\n\n\n<p><\/div><br>\u306f\u8fd4\u308a\u5024\u304c\u6574\u6570\u578b\u306b\u5909\u63db\u3055\u308c\u307e\u3059\u3002\u306a\u304a\u3001int()\u306e\u6319\u52d5\u306f\u5207\u308a\u6368\u3066\u3068\u540c\u3058\u306b\u306a\u308a\u307e\u3059\u3002\u72b6\u6cc1\u306b\u3088\u3063\u3066\u4f7f\u3044\u5206\u3051\u308b\u3068\u826f\u3044\u3067\u3059\u306d\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u4ed6\u306e\u578b\u304b\u3089\u5c0f\u6570\u578b\u306b\u5909\u63db\u3059\u308b\u306b\u306f<\/h3>\n\n\n\n<p>\u3053\u3093\u3069\u306fint\u578b\u304b\u3089\u5c0f\u6570\u578b\u306b\u5909\u63db\u3059\u308b\u5834\u5408\u3092\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u57fa\u672c\u7684\u306b\u3001int\u578b\u3068float\u578b\u304c\u6df7\u5728\u3057\u305f\u8a08\u7b97\u3092\u3059\u308b\u3068\u3001\u7d50\u679c\u306ffloat\u578b\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u3046\u3044\u3063\u305f\u30b7\u30f3\u30d7\u30eb\u306a\u578b\u64cd\u4f5c\u306fPython\u306e\u5074\u3067\u81ea\u52d5\u7684\u306b\u3084\u3063\u3066\u304f\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305f\u3060\u3001\u660e\u793a\u7684\u306b\u578b\u5909\u63db\u3092\u3057\u305f\u3044\u5834\u5408\u3082\u3042\u308a\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u6587\u5b57\u5217\u306e\u4e2d\u306b\u3042\u308b\u6570\u5b57\u3092\u53d6\u308a\u51fa\u3057\u305f\u3044\u5834\u5408\u3067\u3059\u306d\u3002\u305d\u306e\u6642\u306f\u3053\u306e\u3088\u3046\u306b\u3001float()\u3092\u4f7f\u3063\u3066\u6587\u5b57\u5217\u578b\u304b\u3089\u5c0f\u6570\u578b\u306b\u5909\u63db\u3057\u3066\u3042\u3052\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">float_var = float(\"1.234\")\n# &gt;&gt;&gt;1.234 float\u578b\u306b\u5909\u63db\u3055\u308c\u308b<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">decimal\u30e2\u30b8\u30e5\u30fc\u30eb\u3068\u7d44\u307f\u5408\u308f\u305b\u308b<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"700\" height=\"467\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/09\/shutterstock_510273967.jpg\" alt=\"\" class=\"wp-image-73271\" srcset=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/09\/shutterstock_510273967.jpg 700w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/09\/shutterstock_510273967-150x100.jpg 150w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/09\/shutterstock_510273967-300x200.jpg 300w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/09\/shutterstock_510273967-640x427.jpg 640w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n<\/div>\n\n\n<p><div class=\"img-caption\">\u753b\u50cf\uff1ashutter stock<\/div><\/p>\n\n\n\n<p>\u3053\u306e\u7ae0\u3067\u306f<strong>decimal\u30e2\u30b8\u30e5\u30fc\u30eb\u3068\u7d44\u307f\u5408\u308f\u305b\u3066\u3001\u5c0f\u6570\u578b\u3092\u3088\u308a\u4fbf\u5229\u306b<\/strong>\u4f7f\u3063\u3066\u3044\u304f\u65b9\u6cd5\u3092\u307f\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">decimal\u30e2\u30b8\u30e5\u30fc\u30eb\u306e\u57fa\u790e<\/h3>\n\n\n\n<p>\u307e\u305a\u306f\u3001decimal\u30e2\u30b8\u30e5\u30fc\u30eb\u306e\u57fa\u790e\u3092\u5b66\u3073\u307e\u3059\u3002decimal\u30e2\u30b8\u30e5\u30fc\u30eb\u306f\u3069\u3046\u3044\u3046\u3082\u306e\u304b\u3068\u3044\u3046\u3068\u30fb\u30fb\u30fb<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>decimal \u30e2\u30b8\u30e5\u30fc\u30eb\u306f\u6b63\u78ba\u306b\u4e38\u3081\u3089\u308c\u305f\u5341\u9032\u6d6e\u52d5\u5c0f\u6570\u70b9\u7b97\u8853\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u307e\u3059\u3002<br><a href=\"https:\/\/docs.Python.jp\/3\/library\/decimal.html\" target=\"_blank\" rel=\"noopener noreferrer\">https:\/\/docs.Python.jp\/3\/library\/decimal.html<\/a><\/p>\n<\/blockquote>\n\n\n\n<p>\u304b\u307f\u7815\u3044\u3066\u8a00\u3046\u3068\u3001Python\u306710\u9032\u6570\u304c\u304b\u306a\u308a\u6b63\u78ba\u306b\u6271\u3048\u308b\u3088\u3046\u306b\u306a\u308b\u3088\u3001\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002\u524d\u306e\u65b9\u3067\u3061\u3089\u308a\u3068\u8a00\u3044\u307e\u3057\u305f\u304c\u3001float\u578b\u306f\u5185\u90e8\u3067\u306f2\u9032\u6570\u3067\u6271\u308f\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305d\u306e\u305f\u3081\u3001\u4eba\u9593\u306b\u308f\u304b\u308a\u3084\u3059\u304410\u9032\u6570\u306b\u5909\u63db\u3059\u308b\u3068\u3001\u3068\u304d\u3069\u304d\u8a33\u306e\u308f\u304b\u3089\u306a\u3044\uff08\u3088\u3046\u306b\u898b\u3048\u308b\uff09\u7d50\u679c\u3092\u8fd4\u3057\u3066\u304f\u308c\u308b\u8a33\u3067\u3059\u3002\u305d\u308c\u304c\u3001\u3053\u306edecimal\u30e2\u30b8\u30e5\u30fc\u30eb\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001\u304a\u304a\u3088\u305d\u6539\u5584\u3067\u304d\u308b\u306e\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">decimal\u30e2\u30b8\u30e5\u30fc\u30eb\u306e\u4f7f\u3044\u65b9<\/h3>\n\n\n\n<p>\u3055\u3063\u305d\u304fdecimal\u30e2\u30b8\u30e5\u30fc\u30eb\u3092\u4f7f\u3063\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">from decimal import *\ngetcontext().prec = 16\ndec_var = Decimal(\"0.1\")+Decimal(\"0.1\")+Decimal(\"0.1\")\nprint(dec_var)<\/pre>\n\n\n\n<p>\u4f7f\u3044\u65b9\u306f<br><div class=\"box01\"><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><b>\u307e\u305adecimal\u30e2\u30b8\u30e5\u30fc\u30eb\u3092\u30a4\u30f3\u30dd\u30fc\u30c8\u3059\u308b<br>Decimal\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u306a\u3093\u3069\u3082\u4f7f\u3046\u306e\u3067from import\u3068\u3059\u308b\u3068\u697d\u30c1\u30f3<\/b><\/li>\n\n\n\n<li><b>\u6709\u52b9\u6841\u6570\u3092\u8a2d\u5b9a\u3059\u308b<\/b><\/li>\n\n\n\n<li><b>\u6570\u5024\u306fDecimal\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u6587\u5b57\u5217\u3068\u3057\u3066\u4ee3\u5165\u3059\u308b<\/b><\/li>\n<\/ol>\n\n\n\n<p><\/div><br>\u3055\u3066\u3001\u5b9f\u969b\u306b\u4e0a\u306e\u30b3\u30fc\u30c9\u3092\u52d5\u304b\u3057\u3066\u307f\u308b\u3068\u3001<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">0.3<\/pre>\n\n\n\n<p>\u3068\u3044\u3046\u7d50\u679c\u304c\u5f97\u3089\u308c\u307e\u3057\u305f\uff01\u524d\u56de\u306e\u3088\u3046\u306b\u5909\u306a\u8aa4\u5dee\u306f\u3064\u304d\u307e\u305b\u3093\u3067\u3057\u305f\u306d\u3002\u3053\u3053\u3067\u3001\u6ce8\u610f\u70b9\u304c1\u3064\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>Decimal\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u4ee3\u5165\u3055\u308c\u305f\u6570\u5b57\u306fDecimal\u578b\u306b\u306a\u308a\u307e\u3059\u3002Decimal\u578b\u306fint\u578b\u3068\u306f\u666e\u901a\u306b\u8a08\u7b97\u3067\u304d\u307e\u3059\u304c\u3001float\u578b\u3068\u306f\u8a08\u7b97\u3067\u304d\u307e\u305b\u3093\u3002Decimal\u578b\u3092\u4f7f\u3046\u5834\u5408\u3001\u5168\u3066\u306e\u5c0f\u6570\u3092decimal\u578b\u3067\u7d71\u4e00\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">decimal \u30e2\u30b8\u30e5\u30fc\u30eb\u306e\u6ce8\u610f\u70b9<\/h3>\n\n\n\n<p>\u5148\u307b\u3069\u306e\u4f8b\u3067\u3001\u300c\u6570\u5b57\u3092\u6271\u3046\u306e\u306b\u306a\u3093\u3067\u6587\u5b57\u5217\u3067\u4ee3\u5165\u3057\u3066\u308b\u3093\u3060\u308d\u3046\uff1f\u300d\u3068\u7591\u554f\u306b\u601d\u3063\u305f\u65b9\u306f\u3044\u306a\u3044\u3067\u3057\u3087\u3046\u304b\uff1f\u5b9f\u306f\u3053\u308c\u3001decimal\u30e2\u30b8\u30e5\u30fc\u30eb\u3067\u5f15\u3063\u304b\u304b\u308a\u3084\u3059\u3044\u30dd\u30a4\u30f3\u30c8\u306a\u3093\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u305c\u3072\u6ce8\u610f\u3057\u3066\u899a\u3048\u3066\u304a\u3044\u3066\u304f\u3060\u3055\u3044\u3002\u8a66\u3057\u306b\u3001\u6b21\u306e\u30bd\u30fc\u30b9\u3067\u5b9f\u9a13\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">print(Decimal(0.1))<\/pre>\n\n\n\n<p>\u7d50\u679c\u306f\u3053\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">Decimal('0.1000000000000000055511151231257827021181583404541015625')<\/pre>\n\n\n\n<p>\u4f55\u3084\u3089\u3088\u304f\u308f\u304b\u3089\u306a\u3044\u6570\u5024\u304c\u51fa\u3066\u304d\u307e\u3057\u305f\u306d\u3002\u5b9f\u306f\u3053\u308c\u3001float\u578b\u306e\u6570\u5024\u304c\u5b9f\u969b\u306b\u3069\u306e\u3088\u3046\u306a\u6570\u5024\u3068\u3057\u3066\u6271\u308f\u308c\u3066\u3044\u308b\u306e\u304b\u3092\u793a\u3057\u3066\u3044\u308b\u3093\u3067\u3059\u3002\u540c\u3058\u3053\u3068\u3092\u4f55\u5ea6\u3082\u66f8\u3044\u3066\u3044\u307e\u3059\u304c\u3001\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u30fc\u5185\u90e8\u3067\u306f2\u9032\u6570\u3067\u7269\u4e8b\u304c\u6271\u308f\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305d\u306e\u305f\u3081\u30012\u9032\u6570\u3067\u6b63\u78ba\u306b\u8868\u73fe\u3067\u304d\u306a\u3044\u6570\u306f\u8fd1\u4f3c\u5024\u3092\u4f7f\u3046\u3057\u304b\u3042\u308a\u307e\u305b\u3093\u300210\u9032\u6570\u3067\u8868\u73fe\u3059\u308c\u3070\u305f\u3063\u305f1\u6841\u306e0.1\u30822\u9032\u6570\u3067\u306f\u6b63\u78ba\u306b\u8868\u73fe\u3067\u304d\u305a\u3001\u3053\u306e\u3088\u3046\u306a\u8fd1\u4f3c\u5024\u3092\u4f7f\u308f\u3056\u308b\u3092\u5f97\u306a\u3044\u306e\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u3060\u304b\u3089\u30010.1+0.1+0.1 = 0.30000000000000004\u3068\u3044\u3046\u8b0e\u306e\u8a08\u7b97\u304c\u6210\u308a\u7acb\u3063\u3066\u3044\u305f\u308f\u3051\u3067\u3059\u306d\u3002Decimal\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u4ee3\u5165\u3059\u308b\u306e\u306f\u3001float\u578b\u306e0.1\u3067\u306f\u30c0\u30e1\u306a\u306e\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u305d\u306e\u305f\u3081\u306b\u3001\u6587\u5b57\u5217\u306e&#8221;0.1&#8243;\u3068\u3044\u3046\u4e00\u898b\u56de\u308a\u304f\u3069\u3044\u3082\u306e\u3092\u4ee3\u5165\u3057\u3066\u3044\u308b\u3093\u3067\u3059\u306d\u3002Decimal\u306e\u4ee3\u5165\u306f\u6587\u5b57\u5217\uff01\u3000\u3068\u899a\u3048\u307e\u3057\u3087\u3046\u3002\u91d1\u878d\u3084\u4f1a\u8a08\u7cfb\u306e\u30b7\u30b9\u30c6\u30e0\u3092\u7d44\u3080\u5834\u5408\u306e\u3088\u3046\u306b\u3001\u7279\u306b<strong>\u8aa4\u5dee\u304c\u7d76\u5bfe\u306b\u8a31\u3055\u308c\u306a\u3044\u5834\u9762\u3082\u5b58\u5728\u3057\u307e\u3059<\/strong>\u3002\u3046\u3063\u304b\u308afloat\u578b\u3092\u4ee3\u5165\u3057\u3066\u5927\u60e8\u4e8b\u3001\u306a\u3093\u3066\u3053\u3068\u306b\u306a\u3089\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u4efb\u610f\u6841\u306e\u5207\u308a\u4e0a\u3052\u3001\u5207\u308a\u4e0b\u3052<\/h3>\n\n\n\n<p>decimal\u30e2\u30b8\u30e5\u30fc\u30eb\u306e\u4fbf\u5229\u306a\u30e1\u30bd\u30c3\u30c9\u306bquantize()\u304c\u3042\u308a\u307e\u3059\u3002\u4efb\u610f\u306e\u6841\u3067\u597d\u304d\u306a\u5f62\u5f0f\u306e\u4e38\u3081\u3092\u884c\u3048\u308b\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u306e\u3067\u3001\u3053\u3061\u3089\u3082\u4f7f\u3048\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p>\u4f7f\u3044\u65b9\u306e\u4f8b\u3067\u3059<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"> Decimal('7.325').quantize(Decimal('.01'), rounding=ROUND_DOWN)<\/pre>\n\n\n\n<p>\u7d50\u679c<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">Decimal('7.32')<\/pre>\n\n\n\n<p>Decimal\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5bfe\u3057\u3066quantize\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3044\u307e\u3059\u3002<br><div class=\"box01\"><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><b>\u7b2c1\u5f15\u6570\u3067\u6574\u5f62\u3057\u305f\u3044\u5f62\u306eDecimal\u30aa\u30d6\u30b8\u30a7\u30af\u30c8<\/b><\/li>\n\n\n\n<li><b>\u7b2c2\u5f15\u6570\u3067\u4e38\u3081\u306e\u5f62\u5f0f\uff08\u7701\u7565\u53ef\u80fd\uff09<\/b><\/li>\n<\/ul>\n\n\n<\/div>\n\n\n\n<p>\u3053\u306e\u5834\u5408\u306f\u5c0f\u6570\u7b2c2\u4f4d\u307e\u3067\u3067\u5207\u308a\u6368\u3066\u3089\u308c\u307e\u3057\u305f\u3002\u7b2c2\u5f15\u6570\u306e\u4e38\u3081\u5f62\u5f0f\u306f\u8272\u3005\u306a\u30aa\u30d7\u30b7\u30e7\u30f3\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u5834\u5408\u306b\u3088\u3063\u3066\u4f7f\u3044\u5206\u3051\u3089\u308c\u3066\u4fbf\u5229\u3067\u3059\u304c\u3001\u57fa\u672c\u7684\u306b<br><div class=\"box01\"><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><b>\u5207\u308a\u6368\u3066\uff1aROUND_DOWN<\/b><\/li>\n\n\n\n<li><b>\u5207\u308a\u4e0a\u3052\uff1aROUND_UP<\/b><\/li>\n\n\n\n<li><b>Python\u98a8\u306eround\uff1aROUND_HALF_EVEN<\/b><\/li>\n\n\n\n<li><b>\u4e00\u822c\u7684\u306a\u56db\u6368\u4e94\u5165\uff1aROUND_HALF_UP<\/b><\/li>\n<\/ul>\n\n\n<\/div>\n\n\n\n<p>\u3092\u899a\u3048\u3066\u304a\u3051\u3070\u5341\u5206\u3067\u3057\u3087\u3046\u3002\u516c\u5f0f\u306e\u4e38\u3081\u30aa\u30d7\u30b7\u30e7\u30f3\u4e00\u89a7\u306f\u3053\u3061\u3089<br><a href=\"https:\/\/docs.Python.jp\/3\/library\/decimal.html#rounding-modes\" target=\"_blank\" rel=\"noopener noreferrer\">https:\/\/docs.Python.jp\/3\/library\/decimal.html#rounding-modes<br><\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5c0f\u6570\u70b9\u306e\u64cd\u4f5c\u3092\u5b8c\u5168\u7406\u89e3\uff01\u307e\u3068\u3081<\/h2>\n\n\n\n<p>\u3044\u304b\u304c\u3060\u3063\u305f\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n\n\n\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f<br><div class=\"box01\"><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><b>Python\u306efloat\u578b\u306e\u57fa\u790e<\/b><\/li>\n\n\n\n<li><b>\u5207\u308a\u6368\u3066\u3001\u5207\u308a\u4e0a\u3052\u306e\u5404\u7a2e\u64cd\u4f5c<\/b><\/li>\n\n\n\n<li><b>float\u578b\u3092\u4f7f\u3046\u969b\u306e\u6ce8\u610f\u70b9<\/b><\/li>\n\n\n\n<li><b>10\u9032\u6570\u3092\u6b63\u78ba\u306b\u6271\u3048\u308bdecimal\u578b\u306b\u3064\u3044\u3066<\/b><\/li>\n<\/ul>\n\n\n<\/div>\n\n\n\n<p>\u3068\u3044\u3063\u305f\u3053\u3068\u3092\u5b66\u3073\u307e\u3057\u305f\u3002\u3053\u308c\u3067\u3001Python\u306e\u5c0f\u6570\u3092\u6271\u3046\u969b\u306b\u906d\u9047\u3059\u308b\u57fa\u672c\u7684\u306a\u554f\u984c\u306f\u89e3\u6c7a\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002\u5c0f\u6570\u70b9\u306b\u95a2\u3057\u3066\u60a9\u3080\u3053\u3068\u304c\u3042\u3063\u305f\u3089\u3001\u307e\u305f\u3053\u306e\u8a18\u4e8b\u3092\u8aad\u307f\u76f4\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u3053\u3093\u306b\u3061\u306f\uff01\u30d5\u30ea\u30fc\u30e9\u30f3\u30b9\u30a8\u30f3\u30b8\u30cb\u30a2\u30fb\u30e9\u30a4\u30bf\u30fc\u306e\u5e73\u5c71\u3067\u3059\u3002 Python\u3067\u5c0f\u6570\u70b9\u3092\u6271\u3063\u3066\u3044\u308b\u3068\u3001 \u56db\u6368\u4e94\u5165\u3063\u3066\u3069\u3046\u3059\u308c\u3070\u3044\u3044\u3093\u3060\u308d\u3046\uff1f\u666e\u901a\u306b\u8a08\u7b97\u3092\u3057\u305f\u306f\u305a\u306a\u306e\u306b\u3001\u7d50\u679c\u304c\u304a\u304b\u3057\u3044\u30fb\u30fb\u30fb \u3068\u3044\u3063\u305f\u5834\u9762\u306b\u906d\u9047\u3057\u305f\u3053\u3068\u3082\u3042\u308b\u306e\u3067\u306f [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":73323,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"image","meta":{"_acf_changed":false,"inline_featured_image":false,"swell_btn_cv_data":"","footnotes":""},"categories":[2350],"tags":[49],"class_list":["post-73255","post","type-post","status-publish","format-image","has-post-thumbnail","hentry","category-python-study","tag-python","post_format-post-format-image"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin 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