{"id":1009213,"date":"2024-12-27T11:09:50","date_gmt":"2024-12-27T03:09:50","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1009213.html"},"modified":"2024-12-27T11:09:53","modified_gmt":"2024-12-27T03:09:53","slug":"python-%e5%a6%82%e4%bd%95n%e7%9a%84%e9%98%b6%e4%b9%98","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1009213.html","title":{"rendered":"python \u5982\u4f55n\u7684\u9636\u4e58"},"content":{"rendered":"

\"python<\/p>\n

Python\u4e2d\u8ba1\u7b97n\u7684\u9636\u4e58\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u5f0f\u5b9e\u73b0\uff0c\u5305\u62ec\u4f7f\u7528\u9012\u5f52\u3001\u5faa\u73af\u4ee5\u53caPython\u5185\u7f6e\u7684math\u5e93\u4e2d\u7684factorial<\/code>\u51fd\u6570\u3002<\/strong>\u5176\u4e2d\uff0c\u4f7f\u7528math\u5e93\u7684\u51fd\u6570\u662f\u6700\u7b80\u5355\u4e14\u9ad8\u6548\u7684\u65b9\u6cd5\uff0c\u4f46\u4e86\u89e3\u9012\u5f52\u548c\u5faa\u73af\u7684\u5b9e\u73b0\u65b9\u5f0f\u6709\u52a9\u4e8e\u6df1\u5165\u7406\u89e3\u7f16\u7a0b\u903b\u8f91\u548c\u9012\u5f52\u7684\u6982\u5ff5\u3002\u4e0b\u9762\u5c06\u8be6\u7ec6\u5c55\u5f00\u8fd9\u4e09\u79cd\u65b9\u6cd5\u7684\u5b9e\u73b0\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528\u9012\u5f52\u8ba1\u7b97\u9636\u4e58<\/p>\n<\/p>\n

\u9012\u5f52\u662f\u4e00\u79cd\u5728\u51fd\u6570\u5185\u90e8\u8c03\u7528\u81ea\u8eab\u7684\u7f16\u7a0b\u6280\u672f\u3002\u8ba1\u7b97\u9636\u4e58\u7684\u9012\u5f52\u65b9\u6cd5\u975e\u5e38\u76f4\u89c2\uff0c\u56e0\u4e3an\u7684\u9636\u4e58\u53ef\u4ee5\u5b9a\u4e49\u4e3an\u4e58\u4ee5(n-1)\u7684\u9636\u4e58\u3002\u9012\u5f52\u65b9\u6cd5\u7684\u57fa\u672c\u601d\u60f3\u662f\u5c06\u95ee\u9898\u9010\u6b65\u5206\u89e3\u4e3a\u66f4\u5c0f\u7684\u5b50\u95ee\u9898\uff0c\u76f4\u5230\u8fbe\u5230\u4e00\u4e2a\u7b80\u5355\u7684\u57fa\u4f8b\uff08\u901a\u5e38\u4e3a0\u7684\u9636\u4e58\u7b49\u4e8e1\uff09\u3002<\/p>\n<\/p>\n

def factorial_recursive(n):<\/p>\n
    """\u8ba1\u7b97n\u7684\u9636\u4e58\uff0c\u4f7f\u7528\u9012\u5f52\u65b9\u6cd5\u3002"""<\/p>\n
    if n == 0:<\/p>\n
        return 1<\/p>\n
    else:<\/p>\n
        return n * factorial_recursive(n - 1)<\/p>\n
\u793a\u4f8b<\/strong><\/h2>\n
print(factorial_recursive(5))  # \u8f93\u51fa\u4e3a120<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u5b9e\u73b0\u4e2d\uff0c\u57fa\u4f8b\u662fn == 0<\/code>\u65f6\u8fd4\u56de1\uff0c\u8fd9\u89e3\u51b3\u4e86\u9012\u5f52\u8c03\u7528\u7684\u7ec8\u6b62\u6761\u4ef6\u3002\u5f53n\u4e0d\u4e3a0\u65f6\uff0c\u51fd\u6570\u8c03\u7528\u81ea\u8eab\u6765\u8ba1\u7b97(n-1)\u7684\u9636\u4e58\uff0c\u5e76\u5c06\u7ed3\u679c\u4e58\u4ee5n\u3002<\/p>\n<\/p>\n
\u4f7f\u7528\u9012\u5f52\u7684\u4f18\u70b9\u5728\u4e8e\u4ee3\u7801\u7b80\u5355\u6613\u8bfb\uff0c\u5bb9\u6613\u7406\u89e3\u6570\u5b66\u4e0a\u9636\u4e58\u7684\u5b9a\u4e49\u3002\u4f46\u9012\u5f52\u4e5f\u6709\u5176\u5c40\u9650\u6027\uff0c\u56e0\u4e3aPython\u5bf9\u9012\u5f52\u8c03\u7528\u7684\u6df1\u5ea6\u6709\u9650\u5236\uff08\u901a\u5e38\u4e3a1000\uff09\uff0c\u56e0\u6b64\u4e0d\u9002\u5408\u8ba1\u7b97\u975e\u5e38\u5927\u7684\u9636\u4e58\u503c\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528\u5faa\u73af\u8ba1\u7b97\u9636\u4e58<\/p>\n<\/p>\n
\u5faa\u73af\u65b9\u6cd5\u901a\u8fc7\u9010\u6b65\u7d2f\u79ef\u8ba1\u7b97\u7ed3\u679c\u6765\u6c42\u89e3\u9636\u4e58\u3002\u4e0e\u9012\u5f52\u4e0d\u540c\uff0c\u5faa\u73af\u65b9\u6cd5\u4e0d\u53d7\u9012\u5f52\u6df1\u5ea6\u9650\u5236\uff0c\u56e0\u6b64\u66f4\u9002\u5408\u5904\u7406\u8f83\u5927\u7684n\u503c\u3002<\/p>\n<\/p>\n
def factorial_loop(n):<\/p>\n
    """\u8ba1\u7b97n\u7684\u9636\u4e58\uff0c\u4f7f\u7528\u5faa\u73af\u65b9\u6cd5\u3002"""<\/p>\n
    result = 1<\/p>\n
    for i in range(2, n + 1):<\/p>\n
        result *= i<\/p>\n
    return result<\/p>\n
\u793a\u4f8b<\/strong><\/h2>\n
print(factorial_loop(5))  # \u8f93\u51fa\u4e3a120<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u5b9e\u73b0\u4e2d\uff0c\u6211\u4eec\u4ece2\u5f00\u59cb\u5faa\u73af\uff0c\u9010\u6b65\u5c06\u6bcf\u4e2a\u6574\u6570\u4e58\u5165result<\/code>\u4e2d\u3002\u4f7f\u7528\u5faa\u73af\u7684\u4f18\u52bf\u5728\u4e8e\u5176\u6548\u7387\u548c\u4e0d\u53d7\u9012\u5f52\u6df1\u5ea6\u9650\u5236\uff0c\u7f3a\u70b9\u662f\u4ee3\u7801\u53ef\u80fd\u4e0d\u5982\u9012\u5f52\u7248\u672c\u76f4\u89c2\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528Python\u5185\u7f6e\u5e93\u51fd\u6570\u8ba1\u7b97\u9636\u4e58<\/p>\n<\/p>\n
Python\u7684math<\/code>\u5e93\u63d0\u4f9b\u4e86\u4e00\u4e2a\u5185\u7f6e\u51fd\u6570factorial<\/code>\uff0c\u53ef\u4ee5\u76f4\u63a5\u7528\u4e8e\u8ba1\u7b97\u9636\u4e58\u3002\u8fd9\u662f\u6700\u7b80\u5355\u548c\u9ad8\u6548\u7684\u65b9\u6cd5\uff0c\u5c24\u5176\u9002\u5408\u5bf9\u6027\u80fd\u8981\u6c42\u8f83\u9ad8\u7684\u5e94\u7528\u573a\u5408\u3002<\/p>\n<\/p>\n
import math<\/p>\n
def factorial_builtin(n):<\/p>\n
    """\u8ba1\u7b97n\u7684\u9636\u4e58\uff0c\u4f7f\u7528math\u5e93\u7684\u5185\u7f6e\u51fd\u6570\u3002"""<\/p>\n
    return math.factorial(n)<\/p>\n
\u793a\u4f8b<\/strong><\/h2>\n
print(factorial_builtin(5))  # \u8f93\u51fa\u4e3a120<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4f7f\u7528math.factorial<\/code>\u7684\u4f18\u70b9\u5728\u4e8e\u5176\u5b9e\u73b0\u7ecf\u8fc7\u9ad8\u5ea6\u4f18\u5316\uff0c\u80fd\u591f\u5feb\u901f\u8ba1\u7b97\u5927\u6570\u7684\u9636\u4e58\u3002\u5b83\u4e5f\u907f\u514d\u4e86\u624b\u52a8\u7f16\u5199\u9012\u5f52\u6216\u5faa\u73af\u903b\u8f91\uff0c\u51cf\u5c11\u4e86\u6f5c\u5728\u7684\u7f16\u7a0b\u9519\u8bef\u3002<\/p>\n<\/p>\n
\u56db\u3001\u6bd4\u8f83\u4e0e\u9009\u62e9<\/p>\n<\/p>\n
\u5728\u9009\u62e9\u8ba1\u7b97\u9636\u4e58\u7684\u65b9\u6cd5\u65f6\uff0c\u5e94\u6839\u636e\u5177\u4f53\u9700\u6c42\u548c\u60c5\u51b5\u8fdb\u884c\u9009\u62e9\uff1a<\/p>\n<\/p>\n
    \n
  1. \u9012\u5f52\u65b9\u6cd5<\/strong>\uff1a\u9002\u5408\u7406\u89e3\u9012\u5f52\u6982\u5ff5\u3001\u5b66\u4e60\u548c\u6559\u5b66\u76ee\u7684\uff0c\u4ee3\u7801\u7b80\u6d01\u6613\u8bfb\uff0c\u4f46\u4e0d\u9002\u5408\u975e\u5e38\u5927\u7684n\u3002<\/li>\n
  2. \u5faa\u73af\u65b9\u6cd5<\/strong>\uff1a\u9002\u5408\u4e00\u822c\u60c5\u51b5\u4e0b\u7684\u4f7f\u7528\uff0c\u5c24\u5176\u662f\u5f53\u9700\u8981\u5904\u7406\u8f83\u5927n\u65f6\uff0c\u907f\u514d\u4e86\u9012\u5f52\u6df1\u5ea6\u9650\u5236\u3002<\/li>\n
  3. \u5185\u7f6e\u51fd\u6570<\/strong>\uff1a\u9002\u5408\u8ffd\u6c42\u6027\u80fd\u548c\u7b80\u6d01\u6027\u7684\u573a\u5408\uff0c\u5c24\u5176\u662f\u5bf9\u5927\u6570\u9636\u4e58\u7684\u8ba1\u7b97\u3002<\/li>\n<\/ol>\n
    \u4e94\u3001\u6027\u80fd\u4e0e\u4f18\u5316<\/p>\n<\/p>\n
    \u5bf9\u4e8e\u9700\u8981\u8ba1\u7b97\u975e\u5e38\u5927\u6570\u9636\u4e58\u7684\u573a\u5408\uff0c\u9009\u62e9\u5408\u9002\u7684\u7b97\u6cd5\u548c\u5de5\u5177\u662f\u81f3\u5173\u91cd\u8981\u7684\u3002\u4f7f\u7528Python\u5185\u7f6e\u7684math.factorial<\/code>\u901a\u5e38\u5df2\u7ecf\u8db3\u591f\uff0c\u4f46\u5728\u4e00\u4e9b\u6781\u7aef\u60c5\u51b5\u4e0b\uff0c\u53ef\u80fd\u9700\u8981\u8003\u8651\u4f7f\u7528\u66f4\u9ad8\u7ea7\u7684\u6570\u5b66\u5e93\uff08\u5982NumPy\u6216SymPy\uff09\u6765\u5904\u7406\u8d85\u5927\u6570\u503c\u7684\u8ba1\u7b97\u3002\u6b64\u5916\uff0c\u7406\u89e3Python\u7684\u6574\u6570\u8fd0\u7b97\u7279\u70b9\u548c\u5185\u5b58\u7ba1\u7406\u6709\u52a9\u4e8e\u4f18\u5316\u8ba1\u7b97\u8fc7\u7a0b\u3002<\/p>\n<\/p>\n
    \u516d\u3001\u5e94\u7528\u4e0e\u62d3\u5c55<\/p>\n<\/p>\n
    \u8ba1\u7b97\u9636\u4e58\u5728\u6570\u5b66\u3001\u7edf\u8ba1\u5b66\u548c\u8ba1\u7b97\u673a\u79d1\u5b66\u4e2d\u6709\u5e7f\u6cdb\u5e94\u7528\u3002\u4f8b\u5982\uff0c\u5728\u7ec4\u5408\u6570\u5b66\u4e2d\uff0c\u9636\u4e58\u7528\u4e8e\u8ba1\u7b97\u6392\u5217\u548c\u7ec4\u5408\u7684\u6570\u91cf\uff1b\u5728\u6982\u7387\u8bba\u4e2d\uff0c\u5b83\u7528\u4e8e\u8ba1\u7b97\u6982\u7387\u5206\u5e03\u51fd\u6570\u3002\u6b64\u5916\uff0c\u9636\u4e58\u8fd8\u5728\u7b97\u6cd5\u8bbe\u8ba1\u4e0e\u5206\u6790\u4e2d\u7528\u4e8e\u63cf\u8ff0\u590d\u6742\u5ea6\u548c\u89e3\u51b3\u9012\u5f52\u65b9\u7a0b\u3002<\/p>\n<\/p>\n
    \u603b\u7ed3\uff0cPython\u63d0\u4f9b\u4e86\u591a\u79cd\u65b9\u6cd5\u6765\u8ba1\u7b97\u9636\u4e58\uff0c\u4ece\u9012\u5f52\u5230\u5faa\u73af\uff0c\u518d\u5230\u5185\u7f6e\u51fd\u6570\uff0c\u6bcf\u79cd\u65b9\u6cd5\u90fd\u6709\u5176\u4f18\u7f3a\u70b9\u548c\u9002\u7528\u573a\u5408\u3002\u7406\u89e3\u8fd9\u4e9b\u5b9e\u73b0\u65b9\u5f0f\u4e0d\u4ec5\u6709\u52a9\u4e8e\u9009\u62e9\u9002\u5408\u7684\u5de5\u5177\uff0c\u8fd8\u80fd\u52a0\u6df1\u5bf9Python\u7f16\u7a0b\u548c\u6570\u5b66\u6982\u5ff5\u7684\u7406\u89e3\u3002<\/p>\n<\/p>\n
    \u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
     1. \u4ec0\u4e48\u662f\u9636\u4e58\uff0c\u5982\u4f55\u7528Python\u8ba1\u7b97n\u7684\u9636\u4e58\uff1f<\/strong>
    \u9636\u4e58\u662f\u4e00\u4e2a\u975e\u8d1f\u6574\u6570n\u7684\u4e58\u79ef\uff0c\u8868\u793a\u4e3an!\uff0c\u5176\u5b9a\u4e49\u4e3an! = n \u00d7 (n-1) \u00d7 (n-2) \u00d7 … \u00d7 1\u3002\u5f53n\u4e3a0\u65f6\uff0c0!\u7684\u503c\u4e3a1\u3002\u4f7f\u7528Python\u8ba1\u7b97n\u7684\u9636\u4e58\u53ef\u4ee5\u901a\u8fc7\u9012\u5f52\u6216\u5faa\u73af\u7684\u65b9\u6cd5\u5b9e\u73b0\uff0cPython\u7684\u6807\u51c6\u5e93\u4e5f\u63d0\u4f9b\u4e86\u4e00\u4e2a\u65b9\u4fbf\u7684\u51fd\u6570\u3002\u53ef\u4ee5\u4f7f\u7528math.factorial(n)<\/code>\u6765\u76f4\u63a5\u5f97\u5230n\u7684\u9636\u4e58\uff0c\u793a\u4f8b\u5982\u4e0b\uff1a  <\/p>\n
    import math  \nresult = math.factorial(n)  \n<\/code><\/pre>\n
    2. \u5728Python\u4e2d\uff0c\u5982\u4f55\u907f\u514d\u8ba1\u7b97\u5927\u6570\u9636\u4e58\u65f6\u7684\u6ea2\u51fa\u95ee\u9898\uff1f<\/strong>
    \u5728\u8ba1\u7b97\u8f83\u5927\u7684\u9636\u4e58\u65f6\uff0c\u6574\u6570\u7684\u5927\u5c0f\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6ea2\u51fa\uff0c\u4f46Python\u7684\u6574\u6570\u7c7b\u578b\u662f\u52a8\u6001\u6269\u5c55\u7684\uff0c\u53ef\u4ee5\u5904\u7406\u4efb\u610f\u5927\u5c0f\u7684\u6574\u6570\u3002\u7136\u800c\uff0c\u8ba1\u7b97\u5927\u6570\u9636\u4e58\u65f6\u53ef\u80fd\u4f1a\u5f71\u54cd\u6027\u80fd\uff0c\u4f7f\u7528math.factorial()<\/code>\u51fd\u6570\u662f\u6700\u4f73\u9009\u62e9\uff0c\u56e0\u4e3a\u5b83\u5df2\u7ecf\u8fdb\u884c\u4e86\u4f18\u5316\u3002\u5982\u679c\u9700\u8981\u8ba1\u7b97\u5f88\u5927\u7684\u9636\u4e58\uff0c\u53ef\u4ee5\u8003\u8651\u4f7f\u7528\u751f\u6210\u51fd\u6570\u6216\u5176\u4ed6\u6570\u5b66\u6280\u5de7\u6765\u7b80\u5316\u8ba1\u7b97\u3002<\/p>\n
    3. \u5982\u4f55\u4f7f\u7528Python\u5b9e\u73b0\u81ea\u5b9a\u4e49\u7684\u9636\u4e58\u8ba1\u7b97\u51fd\u6570\uff1f<\/strong>
    \u53ef\u4ee5\u901a\u8fc7\u81ea\u5b9a\u4e49\u51fd\u6570\u6765\u5b9e\u73b0\u9636\u4e58\u7684\u8ba1\u7b97\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u9012\u5f52\u5b9e\u73b0\u548c\u4e00\u4e2a\u5faa\u73af\u5b9e\u73b0\u7684\u793a\u4f8b\uff1a  <\/p>\n
    # \u9012\u5f52\u65b9\u5f0f\ndef factorial_recursive(n):\n    if n == 0:\n        return 1\n    else:\n        return n * factorial_recursive(n - 1\n\n# \u5faa\u73af\u65b9\u5f0f\ndef factorial_iterative(n):\n    result = 1\n    for i in range(1, n + 1):\n        result *= i\n    return result\n<\/code><\/pre>\n
    \u8fd9\u4e24\u79cd\u65b9\u6cd5\u90fd\u80fd\u6709\u6548\u5730\u8ba1\u7b97n\u7684\u9636\u4e58\uff0c\u4f46\u5728\u5904\u7406\u975e\u5e38\u5927\u7684n\u65f6\uff0c\u5faa\u73af\u5b9e\u73b0\u901a\u5e38\u4f1a\u66f4\u5177\u6548\u7387\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"Python\u4e2d\u8ba1\u7b97n\u7684\u9636\u4e58\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u5f0f\u5b9e\u73b0\uff0c\u5305\u62ec\u4f7f\u7528\u9012\u5f52\u3001\u5faa\u73af\u4ee5\u53caPython\u5185\u7f6e\u7684math\u5e93\u4e2d\u7684fact […]","protected":false},"author":3,"featured_media":1009224,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1009213"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=1009213"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1009213\/revisions"}],"predecessor-version":[{"id":1009227,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1009213\/revisions\/1009227"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1009224"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1009213"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1009213"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1009213"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}