{"id":1507,"date":"2020-07-06T00:00:52","date_gmt":"2020-07-05T15:00:52","guid":{"rendered":"https:\/\/www.ishikawasekkei.com\/?p=1507"},"modified":"2020-07-05T17:50:47","modified_gmt":"2020-07-05T08:50:47","slug":"python-programing-1to10-sum","status":"publish","type":"post","link":"https:\/\/www.ishikawasekkei.com\/index.php\/2020\/07\/06\/python-programing-1to10-sum\/","title":{"rendered":"Python \u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0 1\u304b\u308910\u307e\u3067\u306e\u5408\u8a08\u3092\u51fa\u3059"},"content":{"rendered":"\n

\u3000\u898b\u306b\u6765\u3066\u304f\u3060\u3055\u3063\u3066\u3001\u3042\u308a\u304c\u3068\u3046\u3054\u3056\u3044\u307e\u3059\u3002\u77f3\u5ddd\u3055\u3093\u3067\u3059\u3002<\/p>\n\n\n\n

\u3000\u5148\u65e5\u3001\u3068\u3042\u308b\u52c9\u5f37\u4f1a\u3067\u3001Python\u3092\u4f7f\u3063\u30661\u304b\u308910\u307e\u3067\u306e\u5408\u8a08\u3092\u51fa\u3059\u3001\u3068\u3044\u3046\u3053\u3068\u3092\u3084\u3063\u3066\u3044\u305f\u306e\u3067\u3059\u304c\u3001\u81ea\u5206\u3067\u3082\u89e3\u7b54\u3092\u4f5c\u3063\u3066\u307f\u307e\u3057\u305f\u3002\u5bbf\u984c\u306f10\u500b\u8003\u3048\u3066\u304f\u308b\u3001\u3068\u3044\u3046\u3053\u3068\u3060\u3063\u305f\u306e\u3067\u3001\u307c\u304f\u308210\u500b\u3001\u8003\u3048\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n\n\n\n

\u3000\u3042\u3068\u3067\u3001\u5b9f\u884c\u6642\u9593\u3092\u691c\u8a3c\u3059\u308b\u305f\u3081\u306b\u95a2\u6570\u306b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n

\u89e3\u7b54\u3068\u7d50\u679c\uff11<\/h2>\n\n\n\n
In [1]: def a1(N=10):\n   ...:     return 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10\n   ...: print(\"\u89e3\u7b54\uff11\uff1a\", a1())\n\u89e3\u7b54\uff11\uff1a 55<\/pre>\n\n\n\n
\u89e3\u8aac\uff11<\/h2>\n\n\n\n
\u300010\u500b\u4f5c\u3089\u306a\u304d\u3083\u3001\u3068\u3044\u3046\u3053\u3068\u3067\u771f\u3063\u5148\u306b\u601d\u3044\u3064\u3044\u305f\u306e\u304c\u3053\u308c\u3067\u3059\u3002\u5358\u7d14\u306b\u8db3\u3057\u7b97\u3067\u8db3\u3057\u305f\u7d50\u679c\u3092\u623b\u3057\u3066\u3044\u307e\u3059\u3002\uff11\u304b\u3089\uff11\uff10\u307e\u3067\u306e\u5408\u8a08\u3092\u7b97\u51fa\u3059\u308b\u3001\u3068\u3044\u3046\u70b9\u306b\u304a\u3044\u3066\u306f\u5408\u683c\u3067\u3059\u304c\u3001\u95a2\u6570\u3068\u3057\u3066\u306f\u3001\u6c4e\u7528\u6027\u304c\u306a\u304f\u3066\u30a4\u30de\u30a4\u30c1\u3067\u3059\u306d\u3002\u5408\u8a08\u304c50\u307e\u3067\u3068\u304b\u300110000\u307e\u3067\u3001\u3068\u5909\u5316\u3057\u305f\u5834\u5408\u306b\u306f\u4f7f\u3048\u307e\u305b\u3093\u3002\u305d\u3046\u3044\u3046\u610f\u5473\u3067\u3001\u6a21\u7bc4\u89e3\u7b54\u306b\u306f\u9060\u3044\u3067\u3059\u306d\u3002<\/p>\n\n\n\n
\u89e3\u7b54\u3068\u7d50\u679c\uff12<\/h2>\n\n\n\n
In [2]: def a2(N=10):\n   ...:     s = 0\n   ...:     for i in range(1, N+1):\n   ...:         s += i\n   ...:     return s\n   ...: print(\"\u89e3\u7b54\uff12\uff1a\", a2())\n\u89e3\u7b54\uff12\uff1a 55<\/pre>\n\n\n\n
\u89e3\u8aac\uff12<\/h2>\n\n\n\n
\u3000\u6b21\u306b\u601d\u3044\u3064\u3044\u305f\u306e\u304c\u3001\u3053\u308c\u3067\u3059\u306d\u3002\u305f\u3076\u3093\u3001\u3044\u3061\u3070\u3093\u30aa\u30fc\u30bd\u30c9\u30c3\u30af\u30b9\u306a\u3084\u3064\u3067\u306f\u3001\u3068\u3001\u601d\u3044\u307e\u3059\u3002for\u30eb\u30fc\u30d7\u3092\u4f7f\u3063\u3066\u7e70\u308a\u8fd4\u3057\u5b9f\u884c\u3057\u307e\u3059\u304c\u3001\u7b49\u5dee\u6570\u5217\u304c\u5fc5\u8981\u306a\u3068\u304d\u306f\u3001\u7d44\u307f\u8fbc\u307f\u95a2\u6570\u306erange()\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u4e8c\u3064\u6307\u5b9a\u3057\u3066\u3044\u307e\u3059\u304c\u3001\u3072\u3068\u3064\u3081\u306e1\u306f\u3001\u521d\u671f\u5024\u30671\u304b\u3089\u59cb\u3081\u308b\u3001\u3068\u3044\u3046\u610f\u5473\u3067\u3059\u3002\u3075\u305f\u3064\u3081\u306eN+1\u306f\u3001N+1\u306e\u3072\u3068\u3064\u524d\u306e\u6570\u5b57\u307e\u3067\u7e70\u308a\u8fd4\u3059\u3001\u3068\u3044\u3046\u610f\u5473\u3067\u3059\u3002\u3053\u308c\u3067\u30011\u304b\u3089\u59cb\u3081\u306611\u306e\u3072\u3068\u3064\u307e\u3048\u306e10\u307e\u3067\u7e70\u308a\u8fd4\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
\u3000for\u30eb\u30fc\u30d7\u306e\u69cb\u6587\u306e\u6700\u5f8c\u306b\u6307\u5b9a\u3059\u308b\u3082\u306e\u306f\u3001\u30a4\u30c6\u30e9\u30d6\u30eb\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u3044\u3063\u3066\u3001\u53cd\u5fa9\u53ef\u80fd\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\u5177\u4f53\u7684\u306b\u306f\u3001\u30ea\u30b9\u30c8\u3084\u6587\u5b57\u5217\u306a\u3069\u306f\u30a4\u30c6\u30e9\u30d6\u30eb\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3001\u7e70\u308a\u8fd4\u3057\u6271\u3046\u305f\u3081\u306e\u8981\u7d20\u3092\u8907\u6570\u6301\u3063\u3066\u3044\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u3053\u3068\u3067\u3059\u3002for\u30eb\u30fc\u30d7\u3067\u6307\u5b9a\u3055\u308c\u308b\u3068\u3001\u305d\u306e\u8981\u7d20\u3092\u3072\u3068\u3064\u305a\u3064\u51e6\u7406\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
\u3000\u3053\u3053\u3067\u4f7f\u7528\u3055\u308c\u3066\u3044\u308b\u7d44\u307f\u8fbc\u307f\u95a2\u6570\u306erange()\u306f\u3001\u30d1\u30e9\u30e1\u30fc\u30bf\u3067\u6307\u5b9a\u3055\u308c\u305f\u6570\u306e\u30b7\u30fc\u30b1\u30f3\u30b9\u3067\u3001\u30a4\u30c6\u30e9\u30d6\u30eb\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u306a\u308a\u307e\u3059\u3002\u3082\u3063\u3068\u7c21\u5358\u306b\u8a00\u3046\u3068\u3001\u6b21\u306e\u6574\u6570\u306e\u5024\u3092\u9806\u756a\u306b\u8fd4\u3057\u3066\u304f\u308c\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3001\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002\u4e00\u822c\u306b\u3001for\u30eb\u30fc\u30d7\u306b\u304a\u3044\u3066\u7279\u5b9a\u306e\u56de\u6570\u306e\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u306b\u4f7f\u308f\u308c\u307e\u3059\u3002\u6587\u7ae0\u3088\u308a\u3082\u5b9f\u969b\u306e\u623b\u308a\u5024\u3092\u78ba\u8a8d\u3057\u3066\u3082\u3089\u3063\u305f\u65b9\u304c\u65e9\u3044\u3068\u601d\u3044\u307e\u3059\u306e\u3067\u3001\u307e\u305a\u306f\u5b9f\u884c\u7d50\u679c\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n
In [1]: range(3).__iter__()\nOut[1]: <range_iterator at 0x26faa394f50>\n\nIn [2]: i = range(3).__iter__()\n\nIn [3]: i.__next__()\nOut[3]: 0\n\nIn [4]: i.__next__()\nOut[4]: 1\n\nIn [5]: i.__next__()\nOut[5]: 2\n\nIn [6]: i.__next__()\nTraceback (most recent call last):\n\n  File \"<ipython-input-6-aa5506447029>\", line 1, in <module>\n    i.__next__()\n\nStopIteration\n\n\nIn [7]: <\/pre>\n\n\n\n
\u3000\u307e\u305a\u306f\u3001for\u30eb\u30fc\u30d7\u306e\u6700\u5f8c\u306e\u8981\u7d20\u306f\u30a4\u30c6\u30e9\u30d6\u30eb\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3059\u306e\u3067\u3001__iter__()\u304c\u547c\u3073\u51fa\u3055\u308c\u3066\u3001\u30a4\u30c6\u30ec\u30fc\u30bf\u304c\u53d6\u5f97\u3055\u308c\u307e\u3059\u3002Out[1]\u304b\u3089\u300crange(3).__iter__()<\/code>\u300d\u306e\u623b\u308a\u5024\u304crange_iterator\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u3044\u3046\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002\u30a4\u30c6\u30ec\u30fc\u30bf\u306f__next__()\u3092\u547c\u3073\u51fa\u3059\u3053\u3068\u3067\u6b21\u306e\u8981\u7d20\u3092\u623b\u3059\u3068\u3044\u3046\u7d04\u675f\u306e\u3042\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3059\u3002\u3053\u3053\u3067__next__()\u3092\u547c\u3073\u51fa\u3059\u3068\u3001\u9806\u756a\u306b\u30010\u30011\u30012\u3092\u623b\u3057\u3066\u3044\u307e\u3059\u306d\u3002In [6]\u306e\u3001\u6700\u5f8c3\u3092\u623b\u3059\u304b\u3068\u3044\u3046\u3068\u3053\u308d\u3067\u3001StopIteration\u306e\u4f8b\u5916\u3092\u767a\u751f\u3057\u307e\u3059\u3002for\u30eb\u30fc\u30d7\u306f\u30a4\u30c6\u30ec\u30fc\u30bf\u304cStopIteration\u304c\u767a\u751f\u3059\u308b\u307e\u3067\u7e70\u308a\u8fd4\u3055\u308c\u308b\u3001\u3068\u3044\u3046\u304a\u7d04\u675f\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u3088\u3046\u306b\u3057\u3066\u3001\u8981\u7d20\u306e\u6570\u5206\u306e\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u304c\u5b9f\u884c\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
\u3000\u3061\u306a\u307f\u306b\u3001__iter__()\u3084__next__()\u306a\u3069\u306e\u7279\u6b8a\u30e1\u30bd\u30c3\u30c9\u306e\u90e8\u5206\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u66f8\u304d\u63db\u3048\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
In [7]: i = iter(range(3))\n\nIn [8]: next(i)\nOut[8]: 0\n\nIn [9]: next(i)\nOut[9]: 1\n\nIn [10]: next(i)\nOut[10]: 2\n\nIn [11]: next(i)\nTraceback (most recent call last):\n\n  File \"<ipython-input-11-a883b34d6d8a>\", line 1, in <module>\n    next(i)\n\nStopIteration\n\nIn [12]: <\/pre>\n\n\n\n
\u3000\u3053\u306e\u7279\u6b8a\u30e1\u30bd\u30c3\u30c9\u306b\u3064\u3044\u3066\u7406\u89e3\u304c\u9032\u3080\u3068\u3001Python\u3067\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u304c\u3088\u308a\u52b9\u7387\u7684\u306b\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u3001\u3082\u3063\u3068\u697d\u3057\u304f\u306a\u3063\u3066\u304f\u308b\u306e\u3067\u306f\u3001\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
\u89e3\u7b54\u3068\u7d50\u679c\uff13<\/h2>\n\n\n\n
def a3(N=10):\n    s = 0\n    for i in range(N):\n        s += (i + 1)\n    return s\nprint(\"\u89e3\u7b54\uff13\uff1a\", a3())\n\u89e3\u7b54\uff13\uff1a 55<\/pre>\n\n\n\n
\u89e3\u8aac\uff13<\/h2>\n\n\n\n
\u3000\u89e3\u7b54\uff12\u306e\u985e\u4f3c\u3067\u30010\u304b\u3089\u59cb\u3081\u30669\u307e\u3067\u306e10\u56de\u7e70\u308a\u8fd4\u3059\u3001\u3068\u3044\u3046\u30eb\u30fc\u30d7\u3067\u5408\u8a08\u5024\u3092\u5909\u3048\u308b\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u306d\u3002\u305d\u3093\u306a\u306b\u9055\u3044\u306f\u3042\u308a\u307e\u305b\u3093\u304c\u3059\u3079\u3066\u306e\u7e70\u308a\u8fd4\u3057\u3067\u8db3\u3057\u7b97\u3092\u3057\u3066\u3044\u308b\u5206\u3001\u9045\u3044\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n\n\n\n
\u89e3\u7b54\u3068\u7d50\u679c\uff14<\/h2>\n\n\n\n
In [4]: def a4(N=10):\n   ...:     s = i = 0 \n   ...:     while i < N:\n   ...:         i += 1\n   ...:         s += i\n   ...:     return s\n   ...: print(\"\u89e3\u7b54\uff14\uff1a\", a4())\n\u89e3\u7b54\uff14\uff1a 55<\/pre>\n\n\n\n
\u89e3\u8aac\uff14<\/h2>\n\n\n\n
\u3000Python\u3067\u4f7f\u3048\u308b\u7e70\u308a\u8fd4\u3057\u3082\u3046\u3072\u3068\u3064\u306e\u7e70\u308a\u8fd4\u3057\u69cb\u6587\u306bwhile\u304c\u3042\u308a\u307e\u3059\u3002\u4e8c\u884c\u76ee\u3067\u5909\u6570\u3001s\u3068i\u306b\u305d\u308c\u305e\u308c0\u3092\u4ee3\u5165\u3057\u3066\u521d\u671f\u5316\u3057\u3066\u3044\u307e\u3059\u3002while\u30eb\u30fc\u30d7\u306e\u53f3\u5074\u306b\u6761\u4ef6\u304c\u66f8\u3044\u3066\u3042\u308a\u307e\u3059\u304c\u3001\u3053\u306e\u6761\u4ef6\u304cTrue\u3001\u771f\u306e\u3042\u3044\u3060\u3001\u3053\u306e\u30eb\u30fc\u30d7\u306f\u7e70\u308a\u8fd4\u3055\u308c\u307e\u3059\u3002\u6761\u4ef6\u3092\u66f8\u304d\u9593\u9055\u3048\u308b\u3068\u7121\u9650\u306b\u30eb\u30fc\u30d7\u3057\u307e\u3059\u306e\u3067\u3001\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002
\u30004\u884c\u76ee\u306e\u300ci += 1\u300d\u306f\u3001i\u306b1\u3092\u52a0\u3048\u305f\u5024\u3092\u307e\u305fi\u306b\u4ee3\u5165\u3059\u308b\u3001\u3068\u3044\u3046\u610f\u5473\u3067\u3001i\u304c1\u304b\u3089\u59cb\u307e\u3063\u3066\u3072\u3068\u3064\u305a\u3064\u5897\u3048\u3066\u3044\u304f\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u30025\u884c\u76ee\u306e\u300cs += i\u300d\u306f\u3001s\u306bi\u3092\u52a0\u3048\u305f\u5024\u3092\u4ee3\u5165\u3057\u3066\u3044\u304d\u307e\u3059\u306e\u3067\u3001\u3053\u306e\u884c\u304c\u5408\u8a08\u90e8\u5206\u306e\u51e6\u7406\u3092\u3057\u3066\u3044\u308b\u3068\u8a00\u3063\u3066\u3044\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n\n\n\n
\u89e3\u7b54\u3068\u7d50\u679c\uff15<\/h2>\n\n\n\n
In [5]: def a5(N=10):\n   ...:     s = 0\n   ...:     while N > 0:\n   ...:         s += N\n   ...:         N -= 1\n   ...:     return s\n   ...: print(\"\u89e3\u7b54\uff15\uff1a\", a5())\n\u89e3\u7b54\uff15\uff1a 55<\/pre>\n\n\n\n
\u89e3\u8aac\uff15<\/h2>\n\n\n\n
\u3000\u89e3\u8aac\uff14\u306f1\u304b\u308910\u307e\u3067\u3068\u3044\u3046\u9806\u756a\u3067\u52a0\u3048\u3066\u3044\u304d\u307e\u3057\u305f\u304c\u3001\u4eca\u56de\u306f\u300110\u304b\u30891\u307e\u3067\u3068\u3044\u3046\u9806\u756a\u3067\u52a0\u7b97\u3059\u308b\u3068\u3053\u308d\u304c\u9055\u3044\u307e\u3059\u306d\u30025\u884c\u76ee\u306e\u300cN -= 1\u300d\u30671\u305a\u3064\u6e1b\u7b97\u3057\u3066\u3044\u308b\u3068\u3053\u308d\u304c\u30dd\u30a4\u30f3\u30c8\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n\n\n\n
\u89e3\u7b54\u3068\u7d50\u679c\uff16<\/h2>\n\n\n\n
In [6]: def a6(N=10):\n   ...:     s = 0\n   ...:     for i in range(N,0,-1):\n   ...:         s += i\n   ...:     return s\n   ...: print(\"\u89e3\u7b54\uff16\uff1a\", a6())\n\u89e3\u7b54\uff16\uff1a 55<\/pre>\n\n\n\n
\u89e3\u8aac\uff16<\/h2>\n\n\n\n
\u3000\u89e3\u8aac\uff15\u3092\u3084\u3063\u3066\u3001range()\u306e\u5834\u5408\u306e\u9006\u9806\u306e\u52a0\u7b97\u3092\u5fd8\u308c\u3066\u3044\u305f\u3053\u3068\u306b\u6c17\u3065\u304d\u307e\u3057\u305f\u3002range()\u306e\u7b2c\u4e09\u5f15\u6570\u306b-1\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u30011\u305a\u3064\u6e1b\u7b97\u3057\u3066\u3044\u304f\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002\u307e\u3042\u3001a2\u3001a3\u3068\u3001\u305f\u3044\u3057\u3066\u5909\u308f\u308a\u307e\u305b\u3093\u306d\u3002range()\u306e\u4f7f\u3044\u65b9\u304c\u7570\u306a\u308b\u3060\u3051\u3067\u3059\u3002<\/p>\n\n\n\n
\u89e3\u7b54\u3068\u7d50\u679c\uff17<\/h2>\n\n\n\n
In [7]: def a7(N=10):\n   ...:     if N == 1:\n   ...:         return 1\n   ...:     return N + a7(N - 1)\n   ...: print(\"\u89e3\u7b54\uff17\uff1a\", a7())\n\u89e3\u7b54\uff17\uff1a 55<\/pre>\n\n\n\n
\u89e3\u8aac\uff17<\/h2>\n\n\n\n
\u3000\u3053\u308c\u306f\u3001\u518d\u5e30\u547c\u3073\u51fa\u3057\u3092\u5229\u7528\u3057\u305f\u89e3\u7b54\u3067\u3059\u3002\u518d\u5e30\u547c\u3073\u51fa\u3057\u3068\u306f\u3001\u95a2\u6570\u306e\u4e2d\u3067\u3001\u81ea\u5206\u81ea\u8eab\u306e\u95a2\u6570\u3092\u547c\u3073\u51fa\u3059\u3053\u3068\u3092\u3044\u3044\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u304c\u53ef\u80fd\u306b\u306a\u308b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u4e0a\u306e\u30c6\u30af\u30cb\u30c3\u30af\u3067\u3059\u3002\u30dd\u30a4\u30f3\u30c8\u306f4\u884c\u76ee\u3067\u3001N\u3068\u81ea\u5206\u81ea\u8eab\u3092\u300cN – 1\u300d\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u3067\u547c\u3073\u51fa\u3057\u305f\u3068\u304d\u306e\u623b\u308a\u5024\u3092\u52a0\u7b97\u3057\u3066\u3044\u308b\u3068\u3053\u308d\u3067\u3059\u3002\u547c\u3073\u51fa\u3055\u308c\u305f\u95a2\u6570\u306f\u3001\u300cN – 1\u300d\u3068\u81ea\u5206\u81ea\u8eab\u3092\u300c(N – 1) – 1\u300d\u3067\u547c\u3073\u51fa\u3057\u305f\u5024\u3092\u623b\u3057\u3066\u3001\u3068\u3001\u6b21\u3005\u3068\u547c\u3073\u51fa\u3055\u308c\u30012\u884c\u76ee\u306e\u6761\u4ef6\u3001N\u304c1\u306b\u306a\u308b\u307e\u3067\u518d\u5e30\u7684\u306b\u547c\u3073\u51fa\u3057\u304c\u7e70\u308a\u8fd4\u3055\u308c\u3001N\u304b\u30891\u307e\u3067\u306e\u5408\u8a08\u304c\u6c42\u307e\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
\u3000\u3053\u306e\u30c6\u30af\u30cb\u30c3\u30af\u306e\u82e5\u5e72\u306e\u554f\u984c\u306f\u3001\u95a2\u6570\u547c\u3073\u51fa\u3057\u3092\u4f55\u5ea6\u3082\u7e70\u308a\u8fd4\u3059\u3068\u3053\u308d\u3067\u3059\u3002\u95a2\u6570\u304c\u547c\u3073\u51fa\u3055\u308c\u308b\u3068\u547c\u3073\u51fa\u3057\u305f\u95a2\u6570\u306f\u30b9\u30bf\u30c3\u30af\u3068\u3044\u3046\u3068\u3053\u308d\u3078\u7a4d\u307f\u4e0a\u3052\u3089\u308c\u307e\u3059\u3002\u547c\u3073\u51fa\u3055\u308c\u305f\u95a2\u6570\u306e\u51e6\u7406\u304c\u7d42\u4e86\u3059\u308b\u307e\u3067\u306f\u305d\u3053\u3067\u5f85\u6a5f\u3001\u3068\u3044\u3046\u30a4\u30e1\u30fc\u30b8\u3067\u3059\u306d\u3002\u3053\u308c\u306e\u3069\u3053\u306b\u554f\u984c\u304c\u3042\u308b\u306e\u304b\u3001\u3068\u3044\u3046\u3068\u3001\u3053\u306e\u30b9\u30bf\u30c3\u30af\u306e\u4e0a\u9650\u304c\u6574\u6570\u5024\u3068\u6bd4\u3079\u308b\u3068\u5272\u3068\u5c0f\u3055\u3081\u306b\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308b\u70b9\u3067\u3059\u3002<\/p>\n\n\n\n
\u30001000\u56de\u3067\u306f\u554f\u984c\u306a\u304f\u5b9f\u884c\u3067\u304d\u307e\u3057\u305f\u304c\u300110000\u56de\u3092\u6307\u5b9a\u3059\u308b\u3068\u30a8\u30e9\u30fc\u306b\u306a\u3063\u3066\u3057\u307e\u3044\u307e\u3057\u305f\u3002<\/p>\n\n\n\n
  File \"<ipython-input-4-124a61628543>\", line 4, in a7\n    return N + a7(N - 1)\n\n  File \"<ipython-input-4-124a61628543>\", line 4, in a7\n    return N + a7(N - 1)\n\n  File \"<ipython-input-4-124a61628543>\", line 2, in a7\n    if N == 1:\n\nRecursionError: maximum recursion depth exceeded in comparison<\/pre>\n\n\n\n
\u3000RecursionError\u3068\u3044\u3046\u3053\u3068\u3067\u3001\u518d\u5e30\u30a8\u30e9\u30fc\u3067\u3059\u306d\u3002\u8abf\u3079\u3066\u307f\u308b\u3068<\/a>\u3001\u3053\u3061\u3089\u3067\u73fe\u5728\u5024\u3092\u78ba\u8a8d\u3067\u304d\u308b\u3088\u3046\u3067\u3059\u3002<\/p>\n\n\n\n
In [8]: import sys\n\nIn [9]: sys.getrecursionlimit()\nOut[9]: 3000<\/pre>\n\n\n\n
\u3000\u73fe\u5728\u306e\u5024\u306f3000\u3067\u3057\u305f\u306d\u3002sys.setrecursionlimit()\u3092\u4f7f\u3046\u3053\u3068\u3067\u30bb\u30c3\u30c8\u3082\u3067\u304d\u308b\u3088\u3046\u3067\u3059\u304c\u3001\u9577\u304f\u306a\u308a\u307e\u3059\u306e\u3067\u3001\u4eca\u56de\u306f\u305d\u3053\u307e\u3067\u691c\u8a3c\u3057\u307e\u305b\u3093\u306d\u3002<\/p>\n\n\n\n
\u3000\u3061\u306a\u307f\u306b\u3001return\u6587\u306e\u3068\u3053\u308d\u3078if\u6587\u3092\u8a18\u8ff0\u3059\u308b\u3068\u3001\u95a2\u6570\u5185\u306f\u4ee5\u4e0b\u306e\u4e00\u884c\u3067\u8a18\u8ff0\u3067\u304d\u307e\u3057\u305f\u3002\u3061\u3087\u3063\u3074\u308a\u3060\u3051\u30b9\u30de\u30fc\u30c8\u306a\u611f\u3058\u304c\u3057\u307e\u3059\u306d\u3002<\/p>\n\n\n\n
    return N + a7(N - 1) if N > 1 else 1<\/pre>\n\n\n\n
\u89e3\u7b54\u3068\u7d50\u679c\uff18<\/h2>\n\n\n\n
def a8(N=10):\n    return N * (N + 1) \/\/ 2\nprint(\"\u89e3\u7b54\uff18\uff1a\", a8())\n\u89e3\u7b54\uff18\uff1a 55<\/pre>\n\n\n\n
\u89e3\u8aac\uff18<\/h2>\n\n\n\n
\u3000\u3053\u308c\u306f\u3001\u7b49\u5dee\u6570\u5217\u306e\u5408\u8a08\u3092\u6c42\u3081\u308b\u516c\u5f0f\u3067\u3059\u3002\u3044\u3064\u3082\u516c\u5f0f\u304c\u899a\u3048\u3089\u308c\u306a\u3044\u306e\u3067\u3001\u4ee5\u4e0b\u306e\u753b\u50cf\u306e\u3088\u3046\u306a\u9577\u65b9\u5f62\u306e\u9762\u7a4d\u3092\u8003\u3048\u3066\u304b\u3089\u3001\u305d\u308c\u306e\u534a\u5206\u3001\u3068\u3044\u3046\u3075\u3046\u306b\u3057\u3066\u516c\u5f0f\u3092\u5c0e\u304d\u51fa\u3057\u3066\u3044\u307e\u3059\u3002\u4e0b\u306e\u5834\u5408\u3001(1+10)\u00d710\u304c\u9577\u65b9\u5f62\u306e\u9762\u7a4d\u306b\u306a\u3063\u3066\u3001\u305d\u306e\u534a\u5206\u304c\u6c42\u3081\u308b\u5408\u8a08\u3067\u3059\u306d\u3002\u3053\u308c\u304b\u3089N\u00d7(N+1)\u00f72\u306e\u516c\u5f0f\u3092\u5c0e\u304d\u51fa\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
\"\"
\u7b49\u5dee\u6570\u5217\u306e\u5408\u8a08\u3092\u6c42\u3081\u308b<\/figcaption><\/figure>\n\n\n\n
\u3000\u307c\u304f\u306e\u4e88\u60f3\u3067\u306f\u3001\u3053\u306e\u5f0f\u3092\u4f7f\u3063\u3066\u7b54\u3048\u3092\u51fa\u529b\u3059\u308b\u306e\u304c\u4e00\u756a\u52b9\u7387\u304c\u3088\u3044\u306e\u3067\u306f\u3001\u3068\u3044\u3046\u3075\u3046\u306b\u601d\u3044\u307e\u3057\u305f\u3002\u4ed6\u306e\u51e6\u7406\u306e\u8a08\u7b97\u91cf\u306fO(N)\uff08N\u306b\u6bd4\u4f8b\u3059\u308b\uff09\u306a\u306e\u3067\u3059\u304c\u3001\u3053\u306e\u5f0f\u306e\u8a08\u7b97\u91cf\u306fN\u306e\u5927\u304d\u3055\u306b\u3088\u3089\u306a\u3044\u306e\u3067\u3001O(1)\uff08\u5b9a\u6570\uff09\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
\u89e3\u7b54\u3068\u7d50\u679c\uff19<\/h2>\n\n\n\n
In [9]: def a9(N=10):\n   ...:     return sum(range(N+1))\n   ...: print(\"\u89e3\u7b54\uff19\uff1a\", a9())\n\u89e3\u7b54\uff19\uff1a 55<\/pre>\n\n\n\n
\u89e3\u8aac\uff19<\/h2>\n\n\n\n
\u3000\u5b9f\u306f\u3001\u5bbf\u984c\u306b\u306a\u308b\u524d\u306b\u601d\u3044\u3064\u3044\u305f\u306e\u304c\u3053\u306e\u3084\u308a\u65b9\u3067\u3059\u3002Python\u3060\u3068\u3001\u4eca\u56de\u3084\u308a\u305f\u3044\u3053\u3068\u306f1\u884c\u3067\u5b8c\u6210\u3057\u307e\u3059\u3002\u306f\u3044\u3001\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u52c9\u5f37\u306b\u306f\u306a\u308a\u307e\u305b\u3093\u306d\u3002<\/p>\n\n\n\n
\u89e3\u7b54\u3068\u7d50\u679c\uff11\uff10<\/h2>\n\n\n\n
In [10]: import numpy as np\n    ...: def a10(N=10):\n    ...:     return np.sum(np.arange(N+1))\n    ...: print(\"\u89e3\u7b54\uff11\uff10\uff1a\", a10())\n\u89e3\u7b54\uff11\uff10\uff1a 55<\/pre>\n\n\n\n
\u89e3\u8aac\uff11\uff10<\/h2>\n\n\n\n
\u3000\u3053\u3061\u3089\u3082\u3072\u3068\u3064\u524d\u306ea9()\u3068\u540c\u3058\u3067\u3059\u304c\u3001numpy\u306e\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u5229\u7528\u3057\u3066\u3044\u307e\u3059\u3002\u5927\u91cf\u30c7\u30fc\u30bf\u3092\u6271\u3046\u30e9\u30a4\u30d6\u30e9\u30ea\u304c\u8c4a\u5bcc\u306anumpy\u3067\u3059\u304c\u3001\u3053\u3061\u3089\u306e\u51e6\u7406\u901f\u5ea6\u306f\u3044\u304b\u304c\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n\n\n\n
\u307e\u3068\u3081<\/h2>\n\n\n\n
\u3000\u3055\u3066\u3001\u6700\u5f8c\u306b\u306a\u308a\u307e\u3059\u304c\u3001\u3053\u3053\u3067\u7d39\u4ecb\u3057\u305f\u30ed\u30b8\u30c3\u30af\u306f\u3001\u3069\u308c\u3092\u4f7f\u3046\u306e\u304c\u6b63\u89e3\u306a\u306e\u3067\u3057\u3087\u3046\u304b\u3002\u3069\u308c\u3092\u4f7f\u3063\u3066\u3082\u7d50\u679c\u306f\u3067\u308b\u3057\u3001\u4eca\u56de\u306e\u30ed\u30b8\u30c3\u30af\u306f\u3069\u308c\u3082\u6642\u9593\u304c\u304b\u304b\u308b\u3082\u306e\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u306e\u3067\u3001\u3044\u305a\u308c\u3082\u6b63\u89e3\u3067\u3059\u3002\u7d50\u8ad6\u304b\u3089\u8a00\u3046\u3068\u3001\u601d\u3044\u3064\u3044\u305f\u3082\u306e\u3067\u3059\u3070\u3084\u304f\u5b9f\u88c5\u3059\u308b\u3001\u3082\u3057\u304f\u306f\u3001\u5f8c\u3067\u898b\u305f\u3068\u304d\u306b\u308f\u304b\u308a\u3084\u3059\u3044\u5b9f\u88c5\u306b\u3059\u308b\u3001\u3068\u3044\u3046\u306e\u3067\u554f\u984c\u306a\u3044\u3067\u3057\u3087\u3046\u306d\u3002\u3042\u3001a1\u306f\u3001\u30c0\u30e1\u3067\u3059\u3088\u3002<\/p>\n\n\n\n
\u3000\u3067\u3082\u3001\u30d7\u30ed\u3068\u3057\u3066\u3069\u306e\u3088\u3046\u306b\u5b9f\u88c5\u3059\u308b\u306e\u304c\u6b63\u89e3\u306a\u306e\u304b\u3001\u3068\u3044\u3046\u6307\u91dd\u3092\u6301\u3063\u3066\u304a\u304d\u305f\u3044\u3001\u3068\u3044\u3046\u58f0\u304c\u805e\u3053\u3048\u3066\u304d\u305d\u3046\u3067\u3059\u306d\u3002\u6307\u91dd\u306e\u3072\u3068\u3064\u3068\u3057\u3066\u3001\u51e6\u7406\u901f\u5ea6\u3092\u8a08\u6e2c\u3057\u3066\u304a\u304d\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002IPython\u306b\u306f%timeit\u3068\u3044\u3046\u30de\u30b8\u30c3\u30af\u30b3\u30de\u30f3\u30c9\u304c\u3042\u3063\u3066\u3001\u3044\u3044\u611f\u3058\u306b\u5b9f\u884c\u901f\u5ea6\u3092\u6e2c\u3063\u3066\u304f\u308c\u307e\u3059\u3002<\/p>\n\n\n\n
In [11]: for f in [a1, a2, a3, a4, a5, a6, a7, a8, a9, a10]:\n    ...:     print(f.__name__, \"=\", f(), \":\", end=\"\")\n    ...:     %timeit f()\na1 = 55 :67.2 ns \u00b1 3.61 ns per loop (mean \u00b1 std. dev. of 7 runs, 10000000 loops each)\na2 = 55 :753 ns \u00b1 51.7 ns per loop (mean \u00b1 std. dev. of 7 runs, 1000000 loops each)\na3 = 55 :842 ns \u00b1 56.8 ns per loop (mean \u00b1 std. dev. of 7 runs, 1000000 loops each)\na4 = 55 :799 ns \u00b1 145 ns per loop (mean \u00b1 std. dev. of 7 runs, 1000000 loops each)\na5 = 55 :801 ns \u00b1 109 ns per loop (mean \u00b1 std. dev. of 7 runs, 1000000 loops each)\na6 = 55 :699 ns \u00b1 43 ns per loop (mean \u00b1 std. dev. of 7 runs, 1000000 loops each)\na7 = 55 :1.23 \u00b5s \u00b1 33.7 ns per loop (mean \u00b1 std. dev. of 7 runs, 1000000 loops each)\na8 = 55 :131 ns \u00b1 4.65 ns per loop (mean \u00b1 std. dev. of 7 runs, 10000000 loops each)\na9 = 55 :509 ns \u00b1 19.1 ns per loop (mean \u00b1 std. dev. of 7 runs, 1000000 loops each)\na10 = 55 :3.48 \u00b5s \u00b1 34.1 ns per loop (mean \u00b1 std. dev. of 7 runs, 100000 loops each)<\/pre>\n\n\n\n
\u3000a1\u306f\u53c2\u8003\u5024\u3067\u3059\u304c\u3001\u3044\u3061\u3070\u3093\u901f\u3044\u3067\u3059\u306d\u30021\u304b\u308910\u307e\u3067\u306e\u8a08\u7b97\u3067\u306f\u305d\u3093\u306a\u306b\u5dee\u304c\u51fa\u307e\u305b\u3093\u304c\u3001\u518d\u5e30\u51e6\u7406\u306ea7\u3068numpy\u306e\u51e6\u7406\u304c\u3061\u3087\u3063\u3068\u9045\u3044\u3088\u3046\u3067\u3059\u3002\u3061\u3087\u3063\u30681\u304b\u30891000\u307e\u3067\u306e\u8a08\u7b97\u3067\u6e2c\u5b9a\u3057\u306a\u304a\u3057\u3066\u307f\u307e\u3059\u3002<\/p>\n\n\n\n
In [12]: for f in [a1, a2, a3, a4, a5, a6, a7, a8, a9, a10]:\n    ...:     print(f.__name__, \"=\", f(1000), \":\", end=\"\")\n    ...:     %timeit f(1000)\na1 = 55 :78.2 ns \u00b1 4.14 ns per loop (mean \u00b1 std. dev. of 7 runs, 10000000 loops each)\na2 = 500500 :51 \u00b5s \u00b1 3 \u00b5s per loop (mean \u00b1 std. dev. of 7 runs, 10000 loops each)\na3 = 500500 :78.4 \u00b5s \u00b1 4.88 \u00b5s per loop (mean \u00b1 std. dev. of 7 runs, 10000 loops each)\na4 = 500500 :85.7 \u00b5s \u00b1 6.29 \u00b5s per loop (mean \u00b1 std. dev. of 7 runs, 10000 loops each)\na5 = 500500 :104 \u00b5s \u00b1 13 \u00b5s per loop (mean \u00b1 std. dev. of 7 runs, 10000 loops each)\na6 = 500500 :51.7 \u00b5s \u00b1 3.34 \u00b5s per loop (mean \u00b1 std. dev. of 7 runs, 10000 loops each)\na7 = 500500 :177 \u00b5s \u00b1 26.8 \u00b5s per loop (mean \u00b1 std. dev. of 7 runs, 10000 loops each)\na8 = 500500 :188 ns \u00b1 15.5 ns per loop (mean \u00b1 std. dev. of 7 runs, 10000000 loops each)\na9 = 500500 :16.4 \u00b5s \u00b1 1.3 \u00b5s per loop (mean \u00b1 std. dev. of 7 runs, 100000 loops each)\na10 = 500500 :4.76 \u00b5s \u00b1 162 ns per loop (mean \u00b1 std. dev. of 7 runs, 100000 loops each)<\/pre>\n\n\n\n
\u3000\u3084\u306f\u308a\u6700\u521d\u306e\u898b\u7acb\u3066\u901a\u308a\u3001a8\u306e\u516c\u5f0f\u3092\u4f7f\u3063\u305f\u51e6\u7406\u304c\u6700\u901f\u3067\u3001N\u306e\u5927\u304d\u3055\u306b\u3088\u3089\u306a\u3044\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3067\u3059\u306d\u3002\u305d\u3057\u3066\u3001a7\u306e\u518d\u5e30\u51e6\u7406\u3001\u9045\u3044\u3067\u3059\u306d\u3002\u305d\u3057\u3066numpy\u3092\u4f7f\u3063\u305fa10\u306f\u300110\u56de\u30681000\u56de\u3067\u305d\u3093\u306a\u306b\u5dee\u304c\u51fa\u306a\u3044\u3068\u3044\u3046\u9762\u767d\u3044\u7d50\u679c\u306b\u306a\u308a\u307e\u3057\u305f\u3002\u5927\u91cf\u30c7\u30fc\u30bf\u3092\u6271\u3046\u305f\u3081\u306e\u5de5\u592b\u304c\u3042\u308a\u305d\u3046\u3067\u3059\u306d\u3002\u3042\u3068\u3001a2\u3068a3\u306f\u4e88\u60f3\u901a\u308a\u3001a3\u306e\u65b9\u304c\u82e5\u5e72\u9045\u3081\u3067\u3059\u306d\u3002<\/p>\n\n\n\n
\u3000\u3054\u3089\u3093\u306e\u901a\u308a\u3001\u9045\u3044\u3068\u8a00\u3063\u3066\u3082\u3059\u3079\u30661\u30df\u30ea\u79d2\u4ee5\u5185\u3067\u5b8c\u4e86\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u4eca\u56de\u306e\u30b1\u30fc\u30b9\u3067\u306f\u3001\u307b\u3068\u3093\u3069\u8aa4\u5dee\u3001\u3068\u8003\u3048\u3066\u3082\u5dee\u3057\u652f\u3048\u306a\u3044\u3067\u3057\u3087\u3046\u306d\u3002
\uff081\u79d2=1,000\u30df\u30ea\u79d2=1,000,000\u30de\u30a4\u30af\u30ed\u79d2=1,000,000,000\u30ca\u30ce\u79d2\uff09<\/p>\n\n\n\n
\u30001\u304b\u308910\u307e\u3067\u306e\u5408\u8a08\u3092\u51fa\u3059\u3060\u3051\u3067\u3082\u3001\u3044\u308d\u3044\u308d\u306a\u3084\u308a\u65b9\u304c\u3042\u3063\u3066\u3001\u9762\u767d\u3044\u3067\u3059\u306d\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u3000\u898b\u306b\u6765\u3066\u304f\u3060\u3055\u3063\u3066\u3001\u3042\u308a\u304c\u3068\u3046\u3054\u3056\u3044\u307e\u3059\u3002\u77f3\u5ddd\u3055\u3093\u3067\u3059\u3002 \u3000\u5148\u65e5\u3001\u3068\u3042\u308b\u52c9\u5f37\u4f1a\u3067\u3001Python\u3092\u4f7f\u3063\u30661\u304b\u308910\u307e\u3067\u306e\u5408\u8a08\u3092\u51fa\u3059\u3001\u3068\u3044\u3046\u3053\u3068\u3092\u3084\u3063\u3066\u3044\u305f\u306e\u3067\u3059\u304c\u3001\u81ea\u5206\u3067\u3082\u89e3\u7b54\u3092\u4f5c\u3063\u3066\u307f\u307e\u3057\u305f\u3002\u5bbf\u984c\u306f10\u500b\u8003\u3048\u3066\u304f\u308b\u3001\u3068 … <\/p>\n
“Python \u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0 1\u304b\u308910\u307e\u3067\u306e\u5408\u8a08\u3092\u51fa\u3059” \u306e<\/span>\u7d9a\u304d\u3092\u8aad\u3080<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8,2],"tags":[],"class_list":["post-1507","post","type-post","status-publish","format-standard","hentry","category-program","category-blog"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ishikawasekkei.com\/index.php\/wp-json\/wp\/v2\/posts\/1507","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ishikawasekkei.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ishikawasekkei.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ishikawasekkei.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ishikawasekkei.com\/index.php\/wp-json\/wp\/v2\/comments?post=1507"}],"version-history":[{"count":26,"href":"https:\/\/www.ishikawasekkei.com\/index.php\/wp-json\/wp\/v2\/posts\/1507\/revisions"}],"predecessor-version":[{"id":1537,"href":"https:\/\/www.ishikawasekkei.com\/index.php\/wp-json\/wp\/v2\/posts\/1507\/revisions\/1537"}],"wp:attachment":[{"href":"https:\/\/www.ishikawasekkei.com\/index.php\/wp-json\/wp\/v2\/media?parent=1507"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ishikawasekkei.com\/index.php\/wp-json\/wp\/v2\/categories?post=1507"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ishikawasekkei.com\/index.php\/wp-json\/wp\/v2\/tags?post=1507"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}