{"id":3823,"date":"2026-11-10T10:21:29","date_gmt":"2026-11-10T01:21:29","guid":{"rendered":"https:\/\/qol-kk.com\/wp2\/?p=3823"},"modified":"2026-11-10T10:21:29","modified_gmt":"2026-11-10T01:21:29","slug":"20261110-plan086","status":"publish","type":"post","link":"https:\/\/qol-kk.com\/wp2\/blog\/2026\/11\/10\/20261110-plan086\/","title":{"rendered":"Python \u306e\u30ea\u30b9\u30c8\u5185\u5305\u8868\u8a18 vs \u30b8\u30a7\u30cd\u30ec\u30fc\u30bf\u5f0f\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9"},"content":{"rendered":"

\u6982\u8981<\/h2>\n

Python \u3067\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u7d44\u307f\u7acb\u3066\u308b\u3068\u304d\u3001\u30ea\u30b9\u30c8\u5185\u5305\u8868\u8a18\uff08list comprehension\uff09\u3068\u30b8\u30a7\u30cd\u30ec\u30fc\u30bf\u5f0f\uff08generator expression\uff09\u306f\u3069\u3061\u3089\u3082\u4f3c\u305f\u66f8\u304d\u65b9\u3067\u4f7f\u3048\u307e\u3059\u3002\u898b\u305f\u76ee\u306e\u9055\u3044\u306f []<\/code> \u3068 ()<\/code> \u3060\u3051\u3067\u3059\u304c\u3001\u88cf\u5074\u306e\u52d5\u4f5c\u3068\u30e1\u30e2\u30ea\u306e\u4f7f\u3044\u65b9\u306f\u307e\u3063\u305f\u304f\u5225\u7269\u3067\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306f\u5165\u9580\u8005\u5411\u3051\u306b\u3001\u4e21\u8005\u306e\u9055\u3044\u30fb\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u7279\u6027\u30fb\u4f7f\u3044\u5206\u3051\u3092\u3001\u8a08\u6e2c\u30b3\u30fc\u30c9\u4ed8\u304d\u3067\u6574\u7406\u3057\u307e\u3059\u3002<\/p>\n

\u30ea\u30b9\u30c8\u5185\u5305\u8868\u8a18\u3068\u30b8\u30a7\u30cd\u30ec\u30fc\u30bf\u5f0f\u306e\u9055\u3044<\/h2>\n

\u30ea\u30b9\u30c8\u5185\u5305\u8868\u8a18\u3068\u30b8\u30a7\u30cd\u30ec\u30fc\u30bf\u5f0f\u306f\u3001\u8a55\u4fa1\u306e\u30bf\u30a4\u30df\u30f3\u30b0\u304c\u6839\u672c\u7684\u306b\u7570\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n\n\n\n\n\n\n\n
<\/th>\n\u30ea\u30b9\u30c8\u5185\u5305\u8868\u8a18 [...]<\/code><\/th>\n\u30b8\u30a7\u30cd\u30ec\u30fc\u30bf\u5f0f (...)<\/code><\/th>\n<\/tr>\n<\/thead>\n
\u8a55\u4fa1<\/td>\n\u5373\u6642\uff08eager\uff09<\/td>\n\u9045\u5ef6\uff08lazy\uff09<\/td>\n<\/tr>\n
\u623b\u308a\u5024<\/td>\nlist<\/code><\/td>\ngenerator<\/code><\/td>\n<\/tr>\n
\u30e1\u30e2\u30ea<\/td>\n\u5168\u8981\u7d20\u3092\u4fdd\u6301<\/td>\n1 \u8981\u7d20\u305a\u3064\u751f\u6210<\/td>\n<\/tr>\n
\u518d\u5229\u7528<\/td>\n\u4f55\u5ea6\u3067\u3082\u8d70\u67fb\u53ef\u80fd<\/td>\n1 \u56de\u3067\u4f7f\u3044\u5207\u308a<\/td>\n<\/tr>\n
\u6dfb\u5b57\u30a2\u30af\u30bb\u30b9<\/td>\nresult[3]<\/code> \u53ef<\/td>\n\u4e0d\u53ef<\/td>\n<\/tr>\n
len()<\/code><\/td>\n\u53ef<\/td>\n\u4e0d\u53ef<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u30ea\u30b9\u30c8\u5185\u5305\u8868\u8a18\u306f\u5b9a\u7fa9\u3057\u305f\u77ac\u9593\u306b\u5168\u8981\u7d20\u3092\u8a08\u7b97\u3057\u3066\u30ea\u30b9\u30c8\u306b\u683c\u7d0d\u3057\u307e\u3059\u3002\u4e00\u65b9\u30b8\u30a7\u30cd\u30ec\u30fc\u30bf\u5f0f\u306f\u300c\u6b21\u306e 1 \u8981\u7d20\u3092\u3069\u3046\u4f5c\u308b\u304b\u300d\u3068\u3044\u3046\u624b\u9806\u3060\u3051\u3092\u6301\u3061\u3001next()<\/code> \u304c\u547c\u3070\u308c\u308b\u305f\u3073\u306b 1 \u4ef6\u305a\u3064\u8a08\u7b97\u3057\u3066\u8fd4\u3057\u307e\u3059\u3002<\/p>\n

\u554f\u984c: \u4f7f\u308f\u306a\u3044\u4e2d\u9593\u30ea\u30b9\u30c8\u306b\u30e1\u30e2\u30ea\u3092\u4f7f\u3063\u3066\u3044\u308b<\/h2>\n

\u6b21\u306e\u3088\u3046\u306a\u300c\u6570\u767e\u4e07\u4ef6\u306e\u30c7\u30fc\u30bf\u3092 1 \u56de\u3060\u3051\u56de\u3057\u3066\u5408\u8a08\u3059\u308b\u300d\u51e6\u7406\u3092\u8003\u3048\u307e\u3059\u3002<\/p>\n

total = sum([x * x for x in range(10_000_000)])<\/pre>\n
\u3053\u308c\u306f\u52d5\u304d\u307e\u3059\u304c\u3001[x * x for x in range(10_000_000)]<\/code> \u306e\u90e8\u5206\u3067 1000 \u4e07\u8981\u7d20\u306e\u30ea\u30b9\u30c8\u3092\u30e1\u30e2\u30ea\u4e0a\u306b\u4e38\u3054\u3068\u4f5c\u3063\u3066\u304b\u3089 sum()<\/code> \u306b\u6e21\u3057\u3066\u3044\u307e\u3059\u3002\u4f7f\u3046\u306e\u306f\u5408\u8a08\u5024\u3060\u3051\u306a\u306e\u306b\u3001\u4e2d\u9593\u30ea\u30b9\u30c8\u306e\u305f\u3081\u3060\u3051\u306b\u5927\u91cf\u306e\u30e1\u30e2\u30ea\u3092\u78ba\u4fdd\u3057\u3066\u3057\u307e\u3046\u306e\u304c\u554f\u984c\u3067\u3059\u3002<\/p>\n
\u5bfe\u5fdc: []<\/code> \u3092 ()<\/code> \u306b\u5909\u3048\u308b<\/h2>\n
\u5168\u8981\u7d20\u3092\u30e1\u30e2\u30ea\u306b\u6b8b\u3059\u5fc5\u8981\u304c\u306a\u3044\u51e6\u7406\uff08\u5408\u8a08\u30fb\u6700\u5927\u30fb\u4ef6\u6570\u30fb\u305d\u306e\u307e\u307e 1 \u56de\u30eb\u30fc\u30d7\u3059\u308b\u3060\u3051\u3001\u306a\u3069\uff09\u3067\u306f\u3001[]<\/code> \u3092 ()<\/code> \u306b\u5909\u3048\u308b\u3060\u3051\u3067\u30e1\u30e2\u30ea\u6d88\u8cbb\u3092\u5287\u7684\u306b\u6e1b\u3089\u305b\u307e\u3059\u3002<\/p>\n
# \u30e1\u30e2\u30ea\u3092\u98df\u3046\u66f8\u304d\u65b9\ntotal = sum([x * x for x in range(10_000_000)])\n\n# 1 \u8981\u7d20\u305a\u3064\u6d41\u3059\u66f8\u304d\u65b9\uff08\u4e2d\u9593\u30ea\u30b9\u30c8\u3092\u4f5c\u3089\u306a\u3044\uff09\ntotal = sum(x * x for x in range(10_000_000))<\/pre>\n
sum()<\/code> \u306e\u3088\u3046\u306b\u5f15\u6570\u304c\u95a2\u6570\u547c\u3073\u51fa\u3057\u306e\u552f\u4e00\u306e\u5f15\u6570\u3067\u3042\u308b\u5834\u5408\u3001\u30b8\u30a7\u30cd\u30ec\u30fc\u30bf\u5f0f\u3092\u56f2\u3080\u62ec\u5f27\u306f\u7701\u7565\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092\u8a08\u6e2c\u3059\u308b<\/h2>\n
import sys\n\nlist_comp = [x * x for x in range(1000)]\ngen_expr = (x * x for x in range(1000))\n\nprint(sys.getsizeof(list_comp))  # \u4f8b: 8856 (\u8981\u7d20\u6570\u306b\u6bd4\u4f8b\u3057\u3066\u5897\u3048\u308b)\nprint(sys.getsizeof(gen_expr))   # \u4f8b: 192  (\u8981\u7d20\u6570\u306b\u95a2\u4fc2\u306a\u304f\u307b\u307c\u4e00\u5b9a)<\/pre>\n
\u30ea\u30b9\u30c8\u306f\u8981\u7d20\u6570\u306b\u6bd4\u4f8b\u3057\u3066\u30b5\u30a4\u30ba\u304c\u5897\u3048\u307e\u3059\u304c\u3001\u30b8\u30a7\u30cd\u30ec\u30fc\u30bf\u306f\u300c\u751f\u6210\u5668\u30aa\u30d6\u30b8\u30a7\u30af\u30c8 1 \u500b\u5206\u300d\u306e\u30b5\u30a4\u30ba\u3057\u304b\u6301\u3061\u307e\u305b\u3093\u3002\u3088\u308a\u5b9f\u969b\u306e\u30d4\u30fc\u30af\u30e1\u30e2\u30ea\u3092\u898b\u308b\u306a\u3089 tracemalloc<\/code> \u304c\u4fbf\u5229\u3067\u3059\u3002<\/p>\n
import tracemalloc\n\ndef with_list():\n    return sum([x * x for x in range(1_000_000)])\n\ndef with_gen():\n    return sum(x * x for x in range(1_000_000))\n\nfor label, fn in [(\"list\", with_list), (\"gen\", with_gen)]:\n    tracemalloc.start()\n    fn()\n    current, peak = tracemalloc.get_traced_memory()\n    tracemalloc.stop()\n    print(f\"{label}: peak = {peak \/ 1024 \/ 1024:.1f} MiB\")\n\n# list: peak = \u7d04 35 MiB \u524d\u5f8c\n# gen:  peak = 1 MiB \u672a\u6e80<\/pre>\n
\u5b9f\u884c\u901f\u5ea6\u3092\u8a08\u6e2c\u3059\u308b<\/h2>\n
\u30e1\u30e2\u30ea\u3067\u306f\u5727\u5012\u7684\u306b\u30b8\u30a7\u30cd\u30ec\u30fc\u30bf\u6709\u5229\u3067\u3059\u304c\u3001\u300c\u5168\u8981\u7d20\u3092\u5fc5\u305a\u4f7f\u3046\u300d\u5834\u5408\u306e\u901f\u5ea6\u306f\u307e\u305f\u5225\u306e\u8a71\u3067\u3059\u3002<\/p>\n
import timeit\n\nsetup = \"data = range(1_000_000)\"\n\nt_list = timeit.timeit(\"sum([x * x for x in data])\", setup=setup, number=10)\nt_gen  = timeit.timeit(\"sum(x * x for x in data)\",   setup=setup, number=10)\n\nprint(f\"list comp: {t_list:.3f}s\")\nprint(f\"gen expr : {t_gen:.3f}s\")<\/pre>\n
\u74b0\u5883\u306b\u3088\u308a\u5dee\u306f\u3042\u308a\u307e\u3059\u304c\u3001\u5168\u4ef6\u3092\u6700\u5f8c\u307e\u3067\u6d88\u8cbb\u3059\u308b\u5834\u5408\u306f\u30ea\u30b9\u30c8\u5185\u5305\u8868\u8a18\u306e\u65b9\u304c\u308f\u305a\u304b\u306b\u901f\u3044\u3053\u3068\u304c\u591a\u3044\u3067\u3059\u3002\u30b8\u30a7\u30cd\u30ec\u30fc\u30bf\u306f next()<\/code> \u547c\u3073\u51fa\u3057\u306e\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9\u304c 1 \u8981\u7d20\u3054\u3068\u306b\u4e57\u308b\u305f\u3081\u3067\u3059\u3002<\/p>\n
\u9006\u306b\u9014\u4e2d\u3067\u6253\u3061\u5207\u308b\u51e6\u7406\u3067\u306f\u30b8\u30a7\u30cd\u30ec\u30fc\u30bf\u304c\u5727\u52dd\u3057\u307e\u3059\u3002<\/p>\n
# \u6761\u4ef6\u3092\u6e80\u305f\u3059\u6700\u521d\u306e 1 \u4ef6\u3060\u3051\u6b32\u3057\u3044\ndata = range(10_000_000)\n\n# \u30ea\u30b9\u30c8\u7248: 1000 \u4e07\u4ef6\u3092\u5168\u90e8\u4f5c\u3063\u3066\u304b\u3089\u63a2\u3059 \u2192 \u9045\u3044\nfirst = next(x for x in [v for v in data if v > 5] if x)\n\n# \u30b8\u30a7\u30cd\u30ec\u30fc\u30bf\u7248: 6 \u4ef6\u76ee\u3067\u6b62\u307e\u308b \u2192 \u4e00\u77ac\nfirst = next(x for x in data if x > 5)<\/pre>\n
\u30cf\u30de\u308a\u3069\u3053\u308d: \u30b8\u30a7\u30cd\u30ec\u30fc\u30bf\u306f 1 \u56de\u3067\u4f7f\u3044\u5207\u308b<\/h2>\n
gen = (x for x in range(3))\nprint(list(gen))  # [0, 1, 2]\nprint(list(gen))  # []  \u2190 2 \u56de\u76ee\u306f\u7a7a\u306b\u306a\u308b<\/pre>\n
\u300c1 \u56de\u76ee\u306f\u52d5\u3044\u305f\u306e\u306b 2 \u56de\u76ee\u3067\u7d50\u679c\u304c\u6d88\u3048\u308b\u300d\u3068\u3044\u3046\u30d0\u30b0\u306f\u3053\u308c\u304c\u539f\u56e0\u3067\u3059\u3002\u8907\u6570\u56de\u4f7f\u3046\u306a\u3089\u30ea\u30b9\u30c8\u306b\u5909\u63db\u3057\u3066\u304a\u304d\u307e\u3059\u3002<\/p>\n
\u4f7f\u3044\u5206\u3051\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8<\/h2>\n
    \n
  • \u3053\u306e\u7d50\u679c\u3092 2 \u56de\u4ee5\u4e0a\u30eb\u30fc\u30d7\u3059\u308b\u304b\uff1f \u2192 Yes \u306a\u3089\u30ea\u30b9\u30c8<\/li>\n
  • \u6dfb\u5b57 result[i]<\/code> \u3084 len()<\/code> \u304c\u5fc5\u8981\u304b\uff1f \u2192 Yes \u306a\u3089\u30ea\u30b9\u30c8<\/li>\n
  • \u5408\u8a08\u30fb\u6700\u5927\u30fb\u4ef6\u6570\u306a\u3069 1 \u56de\u96c6\u8a08\u3059\u308b\u3060\u3051\u304b\uff1f \u2192 \u30b8\u30a7\u30cd\u30ec\u30fc\u30bf<\/li>\n
  • \u9014\u4e2d\u3067 break<\/code> \/ \u65e9\u671f return \u3057\u305f\u3044\u304b\uff1f \u2192 \u30b8\u30a7\u30cd\u30ec\u30fc\u30bf<\/li>\n
  • \u30c7\u30fc\u30bf\u304c\u5de8\u5927\u3067\u30e1\u30e2\u30ea\u304c\u5fc3\u914d\u304b\uff1f \u2192 \u30b8\u30a7\u30cd\u30ec\u30fc\u30bf<\/li>\n
  • \u6570\u4ef6\u301c\u6570\u767e\u4ef6\u306e\u5c0f\u3055\u3044\u30c7\u30fc\u30bf\u304b\uff1f \u2192 \u5dee\u306f\u8aa4\u5dee\u3002\u8aad\u307f\u3084\u3059\u3044\u65b9\u3067 OK<\/li>\n<\/ul>\n
    \u307e\u3068\u3081<\/h2>\n
      \n
    • []<\/code> \u306f\u5373\u6642\u8a55\u4fa1\u3067\u5168\u8981\u7d20\u3092\u30e1\u30e2\u30ea\u306b\u6301\u3064\u3002()<\/code> \u306f\u9045\u5ef6\u8a55\u4fa1\u3067 1 \u4ef6\u305a\u3064\u751f\u6210\u3059\u308b\u3002<\/li>\n
    • \u5168\u4ef6\u6d88\u8cbb\u3059\u308b\u3060\u3051\u306a\u3089\u30ea\u30b9\u30c8\u304c\u308f\u305a\u304b\u306b\u901f\u3044\u3002\u9014\u4e2d\u6253\u3061\u5207\u308a\u30fb\u5de8\u5927\u30c7\u30fc\u30bf\u30fb\u30e1\u30e2\u30ea\u7bc0\u7d04\u306a\u3089\u30b8\u30a7\u30cd\u30ec\u30fc\u30bf\u3002<\/li>\n
    • \u8ff7\u3063\u305f\u3089\u300c\u3053\u306e\u7d50\u679c\u3092 2 \u56de\u4ee5\u4e0a\u4f7f\u3046\u304b\uff1f \u6dfb\u5b57\u3067\u30a2\u30af\u30bb\u30b9\u3059\u308b\u304b\uff1f\u300d\u3092\u81ea\u554f\u3059\u308b\u3002No \u306a\u3089\u30b8\u30a7\u30cd\u30ec\u30fc\u30bf\u5f0f\u304c\u7b2c\u4e00\u5019\u88dc\u3002<\/li>\n<\/ul>\n
      \u300c[]<\/code> \u3092 ()<\/code> \u306b\u5909\u3048\u308b\u3060\u3051\u300d\u3067\u6e08\u3080\u5834\u9762\u306f\u610f\u5916\u3068\u591a\u3044\u306e\u3067\u3001sum()<\/code> \/ any()<\/code> \/ max()<\/code> \u306a\u3069\u306b\u6e21\u3059\u3068\u304d\u306f\u4e00\u5ea6\u898b\u76f4\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002\u65e9\u3059\u304e\u308b\u6700\u9069\u5316\u306f\u7981\u7269\u306a\u306e\u3067\u3001\u8a08\u6e2c\u3057\u3066\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u3060\u3068\u5206\u304b\u3063\u3066\u304b\u3089\u7f6e\u304d\u63db\u3048\u308b\u306e\u304c\u9806\u5e8f\u3067\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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