{"id":172757,"date":"2022-04-22T10:24:03","date_gmt":"2022-04-22T02:24:03","guid":{"rendered":"http:\/\/www.idc.net\/help\/172757\/"},"modified":"2022-04-22T10:24:03","modified_gmt":"2022-04-22T02:24:03","slug":"%e5%90%8e%e6%b5%aa%e4%ba%91python%e6%95%99%e7%a8%8b%ef%bc%9apython%e4%b8%adpow%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8%e5%86%85%e7%bd%ae%e8%b0%83%e7%94%a8%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/172757\/","title":{"rendered":"\u540e\u6d6a\u4e91Python\u6559\u7a0b\uff1apython\u4e2dpow\u5982\u4f55\u4f7f\u7528\u5185\u7f6e\u8c03\u7528\uff1f"},"content":{"rendered":"

<\/span><\/p>\n

\u6211\u4eec\u5728\u7528\u51fd\u6570\u8c03\u7528\u7684\u65f6\u5019\u4e00\u822c\u662f\u8981\u8003\u8651\u51fd\u6570\u7684\u8fd4\u56de\u503c\uff0c\u5176\u6b21\u5c31\u662f\u53c2\u6570\u7684\u95ee\u9898\u3002\u76f8\u4fe1\u7ecf\u8fc7\u4e4b\u524d\u51e0\u7bc7\u53c2\u6570\u6587\u7ae0\u7684\u8bb2\u89e3\uff0c\u5927\u90e8\u5206\u5c0f\u4f19\u4f34\u5df2\u7ecf\u5bf9\u53c2\u6570\u4e0d\u964c\u751f\u4e86\u3002\u90a3\u4e48\u4eca\u5929\u6211\u4eec\u5c31\u6765\u8bb2\u8bb2\u5e38\u89c1\u8fd4\u56de\u503c\u7684\u95ee\u9898\u3002\u8fd9\u91cc\u4ee5pow\u51fd\u6570\u7684\u8c03\u7528\u4e3a\u4f8b\uff0c\u5728\u5b66\u4e60\u4f7f\u7528\u65b9\u6cd5\u7684\u540c\u65f6\uff0c\u6211\u4eec\u4f1a\u8bd5\u7740\u627e\u5bfb\u5185\u7f6e\u8c03\u7528\u8fd4\u56de\u503c\u5f97\u7ed3\u679c\u4ee5\u53ca\u8fdb\u884c\u7ed3\u679c\u5206\u6790\u3002<\/span><\/p>\n

pow() \u65b9\u6cd5\u8fd4\u56de xy\uff08x \u7684 y \u6b21\u65b9\uff09 \u7684\u503c\u3002<\/span><\/p>\n

math \u6a21\u5757 pow() \u65b9\u6cd5\u7684\u8bed\u6cd5:<\/span><\/p>\n

import math\nmath.pow(x, y)<\/pre>\n
<\/span><\/p>\n
\n
\u5185\u7f6e\u7684<\/span> pow() \u65b9\u6cd5:<\/span><\/p>\n
pow(x, y[, z])<\/pre>\n
\u51fd\u6570\u662f\u8ba1\u7b97<\/span> x \u7684 y \u6b21\u65b9\uff0c\u5982\u679c z \u5728\u5b58\u5728\uff0c\u5219\u518d\u5bf9\u7ed3\u679c\u8fdb\u884c\u53d6\u6a21\uff0c\u5176\u7ed3\u679c\u7b49\u6548\u4e8e pow(x,y) %z\u3002<\/span><\/p>\n
\u6ce8\u610f\uff1a<\/span>pow() \u901a\u8fc7\u5185\u7f6e\u7684\u65b9\u6cd5\u76f4\u63a5\u8c03\u7528\uff0c\u5185\u7f6e\u65b9\u6cd5\u4f1a\u628a\u53c2\u6570\u4f5c\u4e3a\u6574\u578b\uff0c\u800c math \u6a21\u5757\u5219\u4f1a\u628a\u53c2\u6570\u8f6c\u6362\u4e3a float\u3002<\/span><\/strong><\/span><\/p>\n
 <\/span><\/p>\n
\u4e3e\u4f8b\uff1a<\/span><\/p>\n
# pow(base, exp[, mod])\n \n# pow power exp exponent mod module\n \n# \u8fd4\u56de base \u7684 exp \u6b21\u5e42\uff1b\u5982\u679c mod \u5b58\u5728\uff0c\u5219\u8fd4\u56de base \u7684 exp \u6b21\u5e42\u5bf9 mod \u53d6\u4f59\uff08\u6bd4 pow(base, exp) % mod \u66f4\u9ad8\u6548\uff09\u3002 \u4e24\u53c2\u6570\u5f62\u5f0f pow(base, exp) \u7b49\u4ef7\u4e8e\u4e58\u65b9\u8fd0\u7b97\u7b26: base**exp\u3002\n \n# \u8fd4\u56de base \u7684 exp \u6b21\u5e42\uff1b\nprint(f'{ pow(2, 3) = }')\nprint(f'{ pow(10, 2) = }')\n# \u4e24\u53c2\u6570\u5f62\u5f0f pow(base, exp) \u7b49\u4ef7\u4e8e\u4e58\u65b9\u8fd0\u7b97\u7b26: base**exp\u3002\nprint(f'{ 2**3 = }')\nprint(f'{ 10**2 = }')\n# \u5982\u679c mod \u5b58\u5728\uff0c\u5219\u8fd4\u56de base \u7684 exp \u6b21\u5e42\u5bf9 mod \u53d6\u4f59\uff08\u6bd4 pow(base, exp) % mod \u66f4\u9ad8\u6548\uff09\n# \u5982\u679cmod\u5b58\u5728\uff0c\u4f1a\u4f7f\u7528\u5feb\u901f\u5e42\u53d6\u6a21\u7684\u7b97\u6cd5\u6765\u53d6\u6a21\nimport time\nstart = time.time()\nprint(f'{ pow(1234, 1234567, 67) = }')\nend = time.time()\nprint(f' \u8017\u65f6\uff1a{ end - start = } ')\n# start = time.time()\n# print(f'{ pow(1234, 1234567) % 67 = }')\n# end = time.time()\n# print(f' \u8017\u65f6\uff1a{ end - start = } ')\n#\n# \u53c2\u6570\u5fc5\u987b\u5177\u6709\u6570\u503c\u7c7b\u578b\u3002 \u5bf9\u4e8e\u6df7\u7528\u7684\u64cd\u4f5c\u6570\u7c7b\u578b\uff0c\u5219\u5c06\u5e94\u7528\u53cc\u76ee\u7b97\u672f\u8fd0\u7b97\u7b26\u7684\u7c7b\u578b\u5f3a\u5236\u8f6c\u6362\u89c4\u5219\u3002 \u5bf9\u4e8e int \u64cd\u4f5c\u6570\uff0c\u7ed3\u679c\u5177\u6709\u4e0e\u64cd\u4f5c\u6570\u76f8\u540c\u7684\u7c7b\u578b\uff08\u5f3a\u5236\u8f6c\u6362\u540e\uff09\uff0c\u9664\u975e\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e3a\u8d1f\u503c\uff1b\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u6240\u6709\u53c2\u6570\u5c06\u88ab\u8f6c\u6362\u4e3a\u6d6e\u70b9\u6570\u5e76\u8f93\u51fa\u6d6e\u70b9\u6570\u7ed3\u679c\u3002 \u4f8b\u5982\uff0c10**2 \u8fd4\u56de 100\uff0c\u4f46 10**-2 \u8fd4\u56de 0.01\u3002\n \n# \u53c2\u6570\u5fc5\u987b\u5177\u6709\u6570\u503c\u7c7b\u578b\n# print(f'{ pow(2, \"3\") = }')\n# \u5bf9\u4e8e\u6df7\u7528\u7684\u64cd\u4f5c\u6570\u7c7b\u578b\uff0c\u5219\u5c06\u5e94\u7528\u53cc\u76ee\u7b97\u672f\u8fd0\u7b97\u7b26\u7684\u7c7b\u578b\u5f3a\u5236\u8f6c\u6362\u89c4\u5219\u3002\nprint(f'{ pow(2.0, 3) = }')\n# \u5bf9\u4e8e int \u64cd\u4f5c\u6570\uff0c\u7ed3\u679c\u5177\u6709\u4e0e\u64cd\u4f5c\u6570\u76f8\u540c\u7684\u7c7b\u578b\uff08\u5f3a\u5236\u8f6c\u6362\u540e\uff09\uff0c\u9664\u975e\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e3a\u8d1f\u503c\uff1b\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u6240\u6709\u53c2\u6570\u5c06\u88ab\u8f6c\u6362\u4e3a\u6d6e\u70b9\u6570\u5e76\u8f93\u51fa\u6d6e\u70b9\u6570\u7ed3\u679c\u3002\nprint(f'{ pow(2, 3) = }')\nprint(f'{ pow(2, -3) = }')\n#\n# \u5bf9\u4e8e int \u64cd\u4f5c\u6570 base \u548c exp\uff0c\u5982\u679c\u7ed9\u51fa mod\uff0c\u5219 mod \u5fc5\u987b\u4e3a\u6574\u6570\u7c7b\u578b\u5e76\u4e14 mod \u5fc5\u987b\u4e0d\u4e3a\u96f6\u3002 \u5982\u679c\u7ed9\u51fa mod \u5e76\u4e14 exp \u4e3a\u8d1f\u503c\uff0c\u5219 base \u5fc5\u987b\u76f8\u5bf9\u4e8e mod \u4e0d\u53ef\u6574\u9664\u3002 \u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5c06\u4f1a\u8fd4\u56de pow(inv_base, -exp, mod)\uff0c\u5176\u4e2d inv_base \u4e3a base \u7684\u5012\u6570\u5bf9 mod \u53d6\u4f59\u3002\n#\n \n# \u5bf9\u4e8e int \u64cd\u4f5c\u6570 base \u548c exp\uff0c\u5982\u679c\u7ed9\u51fa mod\uff0c\u5219 mod \u5fc5\u987b\u4e3a\u6574\u6570\u7c7b\u578b\u5e76\u4e14 mod \u5fc5\u987b\u4e0d\u4e3a\u96f6\u3002\n# print(f'{ pow(2, 3, 0) = }')\n \n# \u4e0b\u9762\u7684\u4f8b\u5b50\u662f 38 \u7684\u5012\u6570\u5bf9 97 \u53d6\u4f59:\n#\n# >>>\n# >>> pow(38, -1, mod=97)\n# 23\n# >>> 23 * 38 % 97 == 1\n# True\n# \u5728 3.8 \u7248\u66f4\u6539: \u5bf9\u4e8e int \u64cd\u4f5c\u6570\uff0c\u4e09\u53c2\u6570\u5f62\u5f0f\u7684 pow \u73b0\u5728\u5141\u8bb8\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e3a\u8d1f\u503c\uff0c\u5373\u53ef\u4ee5\u8ba1\u7b97\u5012\u6570\u7684\u4f59\u6570\u3002\n#\n# \u5728 3.8 \u7248\u66f4\u6539: \u5141\u8bb8\u5173\u952e\u5b57\u53c2\u6570\u3002 \u4e4b\u524d\u53ea\u652f\u6301\u4f4d\u7f6e\u53c2\u6570\u3002<\/pre>\n
<\/span><\/p>\n
\n
\u4ee5\u4e0a\u5c31\u662fpython\u4e2dpow\u51fd\u6570\u4f7f\u7528\u5185\u7f6e\u8c03\u7528\u7684\u65b9\u6cd5\uff0c\u6700\u540e\u5bf9\u4e8e\u53c2\u6570\u7684\u8f93\u51fa\u548cmath\u6709\u6240\u4e0d\u540c\uff0c\u8fd9\u70b9\u9700\u8981\u5f15\u8d77\u5927\u5bb6\u7684\u6ce8\u610f\u3002<\/span><\/p>\n<\/p><\/p>\n","protected":false},"excerpt":{"rendered":"
\u6211\u4eec\u5728\u7528\u51fd\u6570\u8c03\u7528\u7684\u65f6\u5019\u4e00\u822c\u662f\u8981\u8003\u8651\u51fd\u6570\u7684\u8fd4\u56de\u503c\uff0c\u5176\u6b21\u5c31\u662f\u53c2\u6570\u7684\u95ee\u9898\u3002\u76f8\u4fe1\u7ecf\u8fc7\u4e4b\u524d\u51e0\u7bc7\u53c2\u6570\u6587\u7ae0\u7684\u8bb2\u89e3\uff0c\u5927\u90e8\u5206\u5c0f\u4f19 […]<\/p>\n","protected":false},"author":1,"featured_media":172758,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[182397],"tags":[],"class_list":["post-172757","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-python"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/172757","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/comments?post=172757"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/172757\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media\/172758"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=172757"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=172757"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=172757"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}