{"id":84,"date":"2026-08-06T00:27:23","date_gmt":"2026-08-05T16:27:23","guid":{"rendered":"https:\/\/ltrainyard.icu\/?p=84"},"modified":"2026-08-06T00:42:58","modified_gmt":"2026-08-05T16:42:58","slug":"day-9-%e5%87%bd%e6%95%b0%e8%bf%9b%e9%98%b6%ef%bc%9aargs-kwargs-lambda-%e9%80%92%e5%bd%92","status":"publish","type":"post","link":"https:\/\/ltrainyard.icu\/index.php\/2026\/08\/06\/day-9-%e5%87%bd%e6%95%b0%e8%bf%9b%e9%98%b6%ef%bc%9aargs-kwargs-lambda-%e9%80%92%e5%bd%92\/","title":{"rendered":"| Day 9 | \u51fd\u6570\u8fdb\u9636\uff1a*args \/ **kwargs \/ lambda \/ \u9012\u5f52 |"},"content":{"rendered":"\n

1 *args \u4e0e **kwargs \u2014\u2014 \u6253\u5305\u4e0e\u62c6\u5305\u7684\u5bf9\u79f0\u9b54\u6cd5<\/h3>\n\n\n\n

\u662f\u4ec0\u4e48\uff1f\u4e3a\u4ec0\u4e48\u5b66\uff1f<\/strong><\/p>\n\n\n\n

*args<\/code> \u628a\u300c\u4efb\u610f\u591a\u4e2a\u4f4d\u7f6e\u53c2\u6570\u300d\u6253\u5305\u6210\u5143\u7ec4\uff0c**kwargs<\/code> \u628a\u300c\u4efb\u610f\u591a\u4e2a\u5173\u952e\u5b57\u53c2\u6570\u300d\u6253\u5305\u6210\u5b57\u5178\uff0c\u5b83\u4eec\u8ba9\u51fd\u6570\u4e0d\u518d\u88ab\u53c2\u6570\u4e2a\u6570\u9650\u5236\u3002\u5199\u5de5\u5177\u5e93\u3001\u914d\u7f6e\u7c7b\u51fd\u6570\u3001\u88c5\u9970\u5668\uff08Day 20+\uff09\u65f6\u51e0\u4e4e\u5fc5\u7528\u3002<\/p>\n\n\n\n

\u5e95\u5c42\u539f\u7406<\/strong><\/p>\n\n\n\n

\u8c03\u7528 f(1, 2, 3)<\/code> \u65f6\uff0cPython \u5148\u628a\u5b9e\u53c2\u6536\u96c6\u6210\u300c\u53c2\u6570\u5217\u8868\u300d\u518d\u4f20\u7ed9\u51fd\u6570\uff1bdef f(*args)<\/code> \u5c31\u662f\u544a\u8bc9 Python\u300c\u628a\u5269\u4e0b\u7684\u6240\u6709\u4f4d\u7f6e\u53c2\u6570\u6536\u96c6\u6210\u4e00\u4e2a\u5143\u7ec4\u585e\u7ed9 args\u300d\u3002**kwargs<\/code> \u540c\u7406\uff0c\u6536\u96c6 key=value<\/code> \u5f62\u5f0f\u7684\u5b9e\u53c2\u6253\u5305\u6210\u5b57\u5178\u3002\u53cd\u8fc7\u6765\uff0c\u8c03\u7528\u65f6\u5728\u5217\u8868\u524d\u52a0 *<\/code>\uff08\u5982 f(*[1,2,3])<\/code>\uff09\u3001\u5728\u5b57\u5178\u524d\u52a0 **<\/code>\uff08\u5982 f(**d)<\/code>\uff09\u5219\u662f\u62c6\u5305<\/strong>\u2014\u2014\u628a\u5bb9\u5668\u5c55\u5f00\u6210\u591a\u4e2a\u72ec\u7acb\u5b9e\u53c2\u3002\u6253\u5305\u4e0e\u62c6\u5305\u662f\u4e00\u5bf9\u5bf9\u79f0\u64cd\u4f5c\u3002<\/p>\n\n\n\n

\u751f\u6d3b\u7c7b\u6bd4<\/strong><\/p>\n\n\n\n

*args<\/code> \u50cf\u8d85\u5e02\u8d2d\u7269\u888b<\/strong>\uff1a\u4f60\u5f80\u888b\u5b50\u91cc\u88c5\u591a\u5c11\u4e1c\u897f\u90fd\u884c\uff08\u4f4d\u7f6e\u53c2\u6570\uff09\uff0c\u5e97\u5458\u88c5\u888b\u540e\u4ea4\u7ed9\u4f60\u4e00\u4e2a\u888b\u5b50\uff08\u5143\u7ec4\uff09\uff0c\u4f60\u56de\u5bb6\u6162\u6162\u6e05\u70b9\u3002**kwargs<\/code> \u50cf\u586b\u8868<\/strong>\uff1a\u6bcf\u4e00\u9879\u90fd\u662f\u300c\u9879\u76ee=\u5185\u5bb9\u300d\uff08\u5982\u300c\u59d3\u540d=\u5c0f\u660e\u300d\uff09\uff0c\u8868\u683c\u81ea\u52a8\u628a\u6240\u6709\u9879\u76ee\u6574\u7406\u6210\u4e00\u672c\u518c\u5b50\uff08\u5b57\u5178\uff09\u3002\u800c\u62c6\u5305\u662f\u53cd\u8fc7\u6765\u2014\u2014\u628a\u888b\u5b50\u91cc\u7684\u4e1c\u897f\u4e00\u6837\u6837\u6446\u5230\u67dc\u53f0\u4e0a\uff08*\uff09\uff0c\u628a\u518c\u5b50\u91cc\u7684\u6761\u76ee\u4e00\u6761\u6761\u5ff5\u51fa\u6765\uff08**\uff09\u3002<\/p>\n\n\n\n

\u6ce8\u610f\u4e8b\u9879\u603b\u7ed3<\/strong><\/p>\n\n\n\n

1 *args \u6253\u5305\u4efb\u610f\u591a\u4e2a\u4f4d\u7f6e\u53c2\u6570<\/strong>\uff1a<\/p>\n\n\n\n

def my_sum(*args):\n    print(\"\u6536\u5230\u53c2\u6570\uff1a\", args)      # args \u662f\u5143\u7ec4\n    return sum(args)\n\nprint(my_sum(1, 2, 3))\nprint(my_sum(4, 5, 6, 7, 8))\n<\/code><\/pre>\n\n\n\n
\u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n\n\n\n
\u6536\u5230\u53c2\u6570\uff1a (1, 2, 3)\n6\n\u6536\u5230\u53c2\u6570\uff1a (4, 5, 6, 7, 8)\n30\n<\/code><\/pre>\n\n\n\n
\u4f20 2 \u4e2a\u30015 \u4e2a\u3001100 \u4e2a\u90fd\u884c\u2014\u2014\u8fd9\u662f\u56fa\u5b9a\u53c2\u6570\u51fd\u6570\u505a\u4e0d\u5230\u7684\u3002<\/p>\n\n\n\n
2 \u62c6\u5305\u2014\u2014\u628a\u5217\u8868 \/ \u5b57\u5178\u300c\u5c55\u5f00\u300d\u6210\u72ec\u7acb\u5b9e\u53c2<\/strong>\uff1a<\/p>\n\n\n\n
def show(a, b, c):\n    print(a, b, c)\n\nnums = [1, 2, 3]\nshow(*nums)              # \u5217\u8868\u52a0 *\uff1a\u5c55\u5f00\u6210 show(1, 2, 3)\n\ninfo = {\"a\": 10, \"b\": 20, \"c\": 30}\nshow(**info)             # \u5b57\u5178\u52a0 **\uff1a\u5c55\u5f00\u6210 show(a=10, b=20, c=30)\n<\/code><\/pre>\n\n\n\n
\u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n\n\n\n
1 2 3\n10 20 30\n<\/code><\/pre>\n\n\n\n
\u6253\u5305\u5728\u5b9a\u4e49\u5904\uff08def f(*args)<\/code>\uff09\uff0c\u62c6\u5305\u5728\u8c03\u7528\u5904\uff08f(*lst)<\/code>\uff09\uff0c\u4e00\u6536\u4e00\u653e\uff0c\u6b63\u597d\u5bf9\u79f0\u3002<\/p>\n\n\n\n
3 **\u666e\u901a\u53c2\u6570 + *args \u6df7\u7528**\uff1a<\/p>\n\n\n\n
def greet(title, *names):\n    print(\"\u5c0a\u656c\u7684\", title)\n    for name in names:\n        print(\"\u6b22\u8fce\", name)\n\ngreet(\"\u5609\u5bbe\", \"\u5c0f\u660e\", \"\u5c0f\u7ea2\", \"\u5c0f\u521a\")\n<\/code><\/pre>\n\n\n\n
\u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n\n\n\n
\u5c0a\u656c\u7684 \u5609\u5bbe\n\u6b22\u8fce \u5c0f\u660e\n\u6b22\u8fce \u5c0f\u7ea2\n\u6b22\u8fce \u5c0f\u521a\n<\/code><\/pre>\n\n\n\n
\u6613\u9519\u70b9<\/strong><\/p>\n\n\n\n
    \n
  • \u9519\u8bef\u5199\u6cd5\uff1adef f(*args, x)<\/code> \u628a\u666e\u901a\u53c2\u6570\u5199\u5728 args \u540e\u9762 \u2192 \u95ee\u9898\uff1a\u62a5 SyntaxError<\/code>\uff0c<\/em>args \u4e4b\u540e\u53ea\u80fd\u8ddf\u5173\u952e\u5b57\u53c2\u6570 \u2192 \u6b63\u786e\u5199\u6cd5\uff1a*args<\/code> \u5199\u5728\u666e\u901a\u53c2\u6570\u540e\u9762<\/strong>\uff1adef f(x, *args)<\/code>\u3002<\/li>\n\n\n\n
  • \u9519\u8bef\u5199\u6cd5\uff1a\u8c03\u7528 f(*nums)<\/code> \u65f6\u5217\u8868\u5143\u7d20\u4e2a\u6570\u548c\u5f62\u53c2\u4e2a\u6570\u5bf9\u4e0d\u4e0a \u2192 \u95ee\u9898\uff1a\u62a5 TypeError<\/code>\uff08\u591a\u4e86\u6216\u5c11\u4e86\uff09 \u2192 \u6b63\u786e\u5199\u6cd5\uff1a\u62c6\u5305\u524d\u5148\u786e\u8ba4\u4e2a\u6570\u5339\u914d\u3002<\/li>\n\n\n\n
  • \u9519\u8bef\u5199\u6cd5\uff1adef f(**kwargs, x)<\/code> \u2192 \u95ee\u9898\uff1a\u62a5 SyntaxError<\/code>\uff0c**kwargs<\/code> \u5fc5\u987b\u662f\u6700\u540e\u4e00\u4e2a\u53c2\u6570 \u2192 \u6b63\u786e\u5199\u6cd5\uff1a**kwargs<\/code> \u6c38\u8fdc\u653e\u53c2\u6570\u5217\u8868\u6700\u540e\u3002<\/li>\n<\/ul>\n\n\n\n
    \u8bb0\u5fc6\u53e3\u8bc0<\/strong>\uff1a\u4e00\u9897\u661f\u6253\u5305\u5143\u7ec4\uff0c\u4e24\u9897\u661f\u6253\u5305\u5b57\u5178\uff1b\u5b9a\u4e49\u5904\u6536\uff0c\u8c03\u7528\u5904\u62c6\uff0c\u4e00\u6536\u4e00\u653e\u5bf9\u79f0\u73a9\u3002<\/p>\n\n\n\n
    2 lambda \u2014\u2014 \u4e00\u53e5\u8bdd\u51fd\u6570\u4e0e\u300c\u51fd\u6570\u662f\u4e00\u7b49\u516c\u6c11\u300d<\/h3>\n\n\n\n
    \u662f\u4ec0\u4e48\uff1f\u4e3a\u4ec0\u4e48\u5b66\uff1f<\/strong><\/p>\n\n\n\n
    lambda \u662f\u7528\u4e00\u884c\u8868\u8fbe\u5f0f\u5199\u5b8c\u7684\u533f\u540d\u51fd\u6570<\/strong>\uff1alambda \u53c2\u6570: \u8fd4\u56de\u503c\u8868\u8fbe\u5f0f<\/code>\u3002\u5b83\u9002\u5408\u300c\u903b\u8f91\u7b80\u5355\u3001\u53ea\u7528\u4e00\u6b21\u300d\u7684\u573a\u666f\uff0c\u6700\u5e38\u89c1\u7684\u7528\u6cd5\u662f\u7ed9 sorted<\/code> \/ map<\/code> \/ filter<\/code> \u63d0\u4f9b\u6392\u5e8f\u6216\u5904\u7406\u89c4\u5219\u3002<\/p>\n\n\n\n
    \u5e95\u5c42\u539f\u7406<\/strong><\/p>\n\n\n\n
    Python \u91cc\u51fd\u6570\u662f\u4e00\u7b49\u516c\u6c11<\/strong>\uff08first-class citizen\uff09\uff1a\u51fd\u6570\u548c\u6570\u5b57\u3001\u5b57\u7b26\u4e32\u4e00\u6837\uff0c\u53ef\u4ee5\u8d4b\u503c\u7ed9\u53d8\u91cf\u3001\u653e\u8fdb\u5217\u8868\u3001\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u3001\u4f5c\u4e3a\u8fd4\u56de\u503c\u3002lambda \u53ea\u662f\u300c\u5feb\u901f\u521b\u5efa\u4e00\u4e2a\u51fd\u6570\u5bf9\u8c61\u300d\u7684\u8bed\u6cd5\u7cd6\u2014\u2014lambda x: x * 2<\/code> \u4e0e def<\/code> \u5b9a\u4e49\u7684\u51fd\u6570\u5728\u5e95\u5c42\u662f\u540c\u4e00\u7c7b\u5bf9\u8c61\uff0c\u533a\u522b\u53ea\u662f lambda \u6ca1\u6709\u540d\u5b57\u3001\u53ea\u80fd\u5199\u4e00\u4e2a\u8868\u8fbe\u5f0f\u3001\u6ca1\u6709\u72ec\u7acb\u4ee3\u7801\u5757\u3002<\/p>\n\n\n\n
    \n
    \u672f\u8bed\u5c0f\u8bcd\u5178\uff1a\u4e00\u7b49\u516c\u6c11<\/strong>\uff08first-class citizen\uff09\u5c31\u662f\u300c\u548c\u666e\u901a\u6570\u636e\u5e73\u8d77\u5e73\u5750\u300d\uff1a\u51fd\u6570\u4e5f\u80fd\u88ab\u5b58\u8fdb\u53d8\u91cf\u3001\u585e\u8fdb\u5bb9\u5668\u3001\u5f53\u53c2\u6570\u4f20\uff0c\u60f3\u600e\u4e48\u7528\u5c31\u600e\u4e48\u7528\u3002<\/p>\n<\/blockquote>\n\n\n\n
    \u751f\u6d3b\u7c7b\u6bd4<\/strong><\/p>\n\n\n\n
    lambda \u50cf\u4e34\u65f6\u53eb\u7684\u4ee3\u9a7e<\/strong>\uff1a\u4e8b\u60c5\u7b80\u5355\uff08\u5c31\u4e00\u53e5\u8bdd\uff09\u3001\u53ea\u7528\u8fd9\u4e00\u6b21\uff0c\u6ca1\u5fc5\u8981\u4e13\u95e8\u8bf7\u4e2a\u5168\u804c\u53f8\u673a\uff08def \u5b9a\u4e49\u3001\u8d77\u540d\u5b57\u3001\u5199\u6587\u6863\uff09\u3002\u5de5\u4f5c\u590d\u6742\uff08\u591a\u884c\u903b\u8f91\u3001\u591a\u6b21\u590d\u7528\uff09\u65f6\uff0c\u8fd8\u662f\u5f97\u96c7\u6b63\u5f0f\u7684\u300c\u51fd\u6570\u5458\u5de5\u300d\u2014\u2014\u6709\u540d\u6709\u59d3\u3001\u6709\u72ec\u7acb\u4ee3\u7801\u5757\uff0c\u53ef\u8bfb\u6027\u66f4\u597d\u3002<\/p>\n\n\n\n
    \u6ce8\u610f\u4e8b\u9879\u603b\u7ed3<\/strong><\/p>\n\n\n\n
    1 lambda \u4e0e def \u7684\u7b49\u4ef7\u5199\u6cd5\u5bf9\u6bd4<\/strong>\uff1a<\/p>\n\n\n\n
    def double(x):            # \u4f20\u7edf\u5199\u6cd5\uff1adef + return\n    return x * 2\n\ndouble2 = lambda x: x * 2   # lambda \u5199\u6cd5\uff1a\u4e00\u884c\u641e\u5b9a\n\nprint(double(5))          # 10\nprint(double2(5))         # 10\nprint(type(double2))      # <class 'function'>\uff0c\u548c def \u51fd\u6570\u662f\u540c\u4e00\u7c7b\u5bf9\u8c61\n<\/code><\/pre>\n\n\n\n
    \u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n\n\n\n
    10\n10\n<class 'function'>\n<\/code><\/pre>\n\n\n\n
    lambda x: x * 2<\/code> \u91cc\uff0c\u5192\u53f7\u524d\u662f\u53c2\u6570\uff0c\u5192\u53f7\u540e\u662f\u8fd4\u56de\u8868\u8fbe\u5f0f<\/strong>\uff08\u81ea\u5e26 return\uff0c\u4e0d\u7528\u5199\uff09\u3002<\/p>\n\n\n\n
    2 \u51fd\u6570\u662f\u4e00\u7b49\u516c\u6c11\u2014\u2014\u51fd\u6570\u53ef\u4ee5\u653e\u8fdb\u5217\u8868 \/ \u5b57\u5178<\/strong>\uff1a<\/p>\n\n\n\n
    def add(a, b):\n    return a + b\n\ndef multiply(a, b):\n    return a * b\n\ntools = [add, multiply]            # \u51fd\u6570\u653e\u8fdb\u5217\u8868\uff08\u6ce8\u610f\uff1a\u6ca1\u5199\u62ec\u53f7\uff09\nprint(tools[0](3, 4))              # \u53d6\u51fa add \u518d\u8c03\u7528\nops = {\"+\": add, \"*\": multiply}    # \u51fd\u6570\u653e\u8fdb\u5b57\u5178\nprint(ops[\"+\"](10, 5))\n<\/code><\/pre>\n\n\n\n
    \u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n\n\n\n
    7\n15\n<\/code><\/pre>\n\n\n\n
    tools = [add, multiply]<\/code> \u91cc\u5199\u7684\u662f\u51fd\u6570\u540d\u5b57<\/strong>\uff08\u6ca1\u6709\u62ec\u53f7\uff09\u2014\u2014\u5b58\u7684\u662f\u51fd\u6570\u5bf9\u8c61\u672c\u8eab\u3002\u51fd\u6570\u548c\u666e\u901a\u6570\u636e\u4e00\u6837\u80fd\u88ab\u5b58\u653e\u3001\u4f20\u9012\uff0c\u8fd9\u662f\u7406\u89e3 map \/ filter \/ sorted \u7684\u57fa\u7840\u3002<\/p>\n\n\n\n
    3 lambda \u5b9e\u9645\u6700\u5e38\u914d\u5408\u6392\u5e8f\u7528<\/strong>\uff1a<\/p>\n\n\n\n
    students = [\"Tom\", \"alice\", \"Bob\"]\nprint(sorted(students))                        # \u9ed8\u8ba4\u6309\u5b57\u6bcd\u6392\uff1a['Bob', 'Tom', 'alice']\nprint(sorted(students, key=lambda s: s.lower()))  # \u5ffd\u7565\u5927\u5c0f\u5199\u6392\uff1a['alice', 'Bob', 'Tom']\n<\/code><\/pre>\n\n\n\n
    \u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n\n\n\n
    ['Bob', 'Tom', 'alice']\n['alice', 'Bob', 'Tom']\n<\/code><\/pre>\n\n\n\n
    \u6613\u9519\u70b9<\/strong><\/p>\n\n\n\n
      \n
    • \u9519\u8bef\u5199\u6cd5\uff1alambda x: x * 2<\/code> \u540e\u9762\u52a0\u8d4b\u503c\u6216 if \u8bed\u53e5 \u2192 \u95ee\u9898\uff1a\u62a5 SyntaxError<\/code>\uff0clambda \u53ea\u80fd\u5199\u4e00\u4e2a\u8868\u8fbe\u5f0f<\/strong> \u2192 \u6b63\u786e\u5199\u6cd5\uff1a\u590d\u6742\u903b\u8f91\u6539\u7528 def<\/code>\u3002<\/li>\n\n\n\n
    • \u9519\u8bef\u5199\u6cd5\uff1atools = [add()]<\/code> \u8bef\u52a0\u62ec\u53f7 \u2192 \u95ee\u9898\uff1a\u5b58\u8fdb\u53bb\u7684\u662f\u8c03\u7528\u7ed3\u679c\u800c\u4e0d\u662f\u51fd\u6570\u672c\u8eab \u2192 \u6b63\u786e\u5199\u6cd5\uff1a\u5b58\u51fd\u6570\u4e0d\u52a0\u62ec\u53f7\uff1a[add]<\/code>\u3002<\/li>\n\n\n\n
    • \u9519\u8bef\u5199\u6cd5\uff1asorted(words, lambda w: w.lower())<\/code> \u5fd8\u4e86 key=<\/code> \u2192 \u95ee\u9898\uff1alambda \u88ab\u5f53\u6210\u5bb9\u5668\uff0c\u62a5 TypeError<\/code> \u2192 \u6b63\u786e\u5199\u6cd5\uff1a\u5fc5\u987b\u5199\u6210 key=lambda ...<\/code>\u3002<\/li>\n<\/ul>\n\n\n\n
      \u8bb0\u5fc6\u53e3\u8bc0<\/strong>\uff1alambda \u4e00\u884c\u6210\u51fd\u6570\uff0c\u5192\u53f7\u524d\u9762\u662f\u53c2\u6570\uff0c\u5192\u53f7\u540e\u9762\u662f\u7ed3\u679c\uff1b\u590d\u6742\u903b\u8f91\u7528 def\uff0c\u53ef\u8bfb\u4f18\u5148\u8bb0\u5fc3\u95f4\u3002<\/p>\n\n\n\n
      3 map \/ filter \u2014\u2014 \u6279\u91cf\u5904\u7406\u6570\u636e\u7684\u8fed\u4ee3\u5668<\/h3>\n\n\n\n
      \u662f\u4ec0\u4e48\uff1f\u4e3a\u4ec0\u4e48\u5b66\uff1f<\/strong><\/p>\n\n\n\n
      map(\u51fd\u6570, \u5bb9\u5668)<\/code> \u628a\u51fd\u6570\u9010\u4e2a\u5e94\u7528<\/strong>\u5230\u5bb9\u5668\u7684\u6bcf\u4e2a\u5143\u7d20\uff08\u8f6c\u6362\uff09\uff1bfilter(\u51fd\u6570, \u5bb9\u5668)<\/code> \u628a\u300c\u51fd\u6570\u8fd4\u56de True\u300d\u7684\u5143\u7d20\u4fdd\u7559<\/strong>\u4e0b\u6765\uff08\u7b5b\u9009\uff09\u3002\u5b83\u4eec\u662f\u300c\u5bf9\u4e00\u5806\u6570\u636e\u6279\u91cf\u64cd\u4f5c\u300d\u7684\u6807\u51c6\u5de5\u5177\uff0c\u4ee3\u7801\u6bd4 for \u5faa\u73af\u66f4\u77ed\u3001\u610f\u56fe\u66f4\u660e\u786e\u3002<\/p>\n\n\n\n
      \u5e95\u5c42\u539f\u7406<\/strong><\/p>\n\n\n\n
      map \/ filter \u8fd4\u56de\u7684\u4e0d\u662f\u5217\u8868\uff0c\u800c\u662f\u8fed\u4ee3\u5668<\/strong>\uff08iterator\uff09\u2014\u2014\u4e00\u79cd\u300c\u6309\u9700\u4ea7\u51fa\u3001\u8fb9\u53d6\u8fb9\u7b97\u300d\u7684\u5bf9\u8c61\u3002\u5b83\u4eec\u4e0d\u4f1a\u4e00\u6b21\u6027\u7b97\u5b8c\u6240\u6709\u7ed3\u679c\uff0c\u800c\u662f\u6bcf\u6b21 next()<\/code> \u65f6\u624d\u53d6\u4e00\u4e2a\u5143\u7d20\u5904\u7406\u4e00\u4e2a\uff0c\u6240\u4ee5\u5904\u7406 100 \u4e07\u4e2a\u5143\u7d20\u4e5f\u53ea\u5360\u56fa\u5b9a\u5185\u5b58\u3002\u6b63\u56e0\u5982\u6b64\uff0cprint(map(...))<\/code> \u53ea\u80fd\u770b\u5230 <map object ...><\/code>\uff0c\u5fc5\u987b\u7528 list()<\/code> \u628a\u5b83\u300c\u62c9\u5b8c\u300d\u8f6c\u6210\u5217\u8868\u624d\u80fd\u770b\u5230\u5168\u90e8\u7ed3\u679c\u3002<\/p>\n\n\n\n
      \n
      \u672f\u8bed\u5c0f\u8bcd\u5178\uff1a\u8fed\u4ee3\u5668<\/strong>\uff08iterator\uff09\u5c31\u662f\u300c\u6309\u9700\u4ea7\u51fa\u6570\u636e\u7684\u5bf9\u8c61\u300d\u2014\u2014\u50cf\u81ea\u52a8\u552e\u8d27\u673a\uff0c\u6309\u4e00\u4e0b\uff08next\uff09\u51fa\u4e00\u6837\uff0c\u4e0d\u6309\u4e0d\u4ea7\uff0c\u6240\u4ee5\u7701\u5185\u5b58\u3002<\/p>\n<\/blockquote>\n\n\n\n
      \u751f\u6d3b\u7c7b\u6bd4<\/strong><\/p>\n\n\n\n
      map \u50cf\u6d41\u6c34\u7ebf\u4f20\u9001\u5e26<\/strong>\uff1a\u6bcf\u4e2a\u96f6\u4ef6\uff08\u5143\u7d20\uff09\u7ecf\u8fc7\u5de5\u4f4d\uff08\u51fd\u6570\uff09\u52a0\u5de5\u4e00\u4e0b\u518d\u51fa\u6765\u2014\u2014\u96f6\u4ef6\u6570\u91cf\u4e0d\u53d8\uff0c\u53ea\u662f\u4e2a\u4e2a\u90fd\u53d8\u4e86\u6837\u3002filter \u50cf\u5b89\u68c0\u95e8<\/strong>\uff1a\u6bcf\u4e2a\u4e58\u5ba2\uff08\u5143\u7d20\uff09\u8fc7\u5b89\u68c0\uff08\u51fd\u6570\u5224\u65ad\uff09\uff0c\u5408\u683c\uff08True\uff09\u653e\u884c\u3001\u4e0d\u5408\u683c\uff08False\uff09\u62e6\u4e0b\u2014\u2014\u4eba\u6570\u53d8\u5c11\uff0c\u4f46\u7559\u4e0b\u6765\u7684\u90fd\u8fbe\u6807\u3002<\/p>\n\n\n\n
      \u6ce8\u610f\u4e8b\u9879\u603b\u7ed3<\/strong><\/p>\n\n\n\n
      1 map \u6279\u91cf\u8f6c\u6362\u2014\u2014\u628a\u6bcf\u4e2a\u6570\u5b57\u7ffb\u500d<\/strong>\uff1a<\/p>\n\n\n\n
      nums = [1, 2, 3, 4, 5]\ndoubled = list(map(lambda x: x * 2, nums))\nprint(doubled)\n<\/code><\/pre>\n\n\n\n
      \u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n\n\n\n
      [2, 4, 6, 8, 10]\n<\/code><\/pre>\n\n\n\n
      \u5143\u7d20\u4e2a\u6570\u4e0d\u53d8\uff085 \u8fdb 5 \u51fa\uff09\uff0c\u4f46\u6bcf\u4e2a\u503c\u90fd\u53d8\u4e86\u2014\u2014\u8fd9\u5c31\u662f\u300c\u8f6c\u6362\u300d\u3002<\/p>\n\n\n\n
      2 filter \u6279\u91cf\u7b5b\u9009\u2014\u2014\u53ea\u4fdd\u7559\u5076\u6570<\/strong>\uff1a<\/p>\n\n\n\n
      nums = [1, 2, 3, 4, 5, 6]\nevens = list(filter(lambda x: x % 2 == 0, nums))\nprint(evens)\n<\/code><\/pre>\n\n\n\n
      \u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n\n\n\n
      [2, 4, 6]\n<\/code><\/pre>\n\n\n\n
      \u5143\u7d20\u4e2a\u6570\u53d8\u5c11\uff086 \u8fdb 3 \u51fa\uff09\u2014\u2014\u8fd9\u5c31\u662f\u300c\u7b5b\u9009\u300d\u3002<\/p>\n\n\n\n
      3 map + filter \u642d\u914d\u4f7f\u7528\uff08\u5148\u7b5b\u540e\u5e73\u65b9\uff09<\/strong>\uff1a<\/p>\n\n\n\n
      nums = [1, 2, 3, 4, 5, 6]\nresult = list(map(lambda x: x * x, filter(lambda x: x % 2 == 0, nums)))\nprint(result)\n<\/code><\/pre>\n\n\n\n
      \u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n\n\n\n
      [4, 16, 36]\n<\/code><\/pre>\n\n\n\n
      \u6613\u9519\u70b9<\/strong><\/p>\n\n\n\n
        \n
      • \u9519\u8bef\u5199\u6cd5\uff1a\u76f4\u63a5 print(map(...))<\/code> \u2192 \u95ee\u9898\uff1a\u6253\u5370\u51fa <map object at 0x...><\/code>\uff0c\u770b\u4e0d\u5230\u6570\u636e \u2192 \u6b63\u786e\u5199\u6cd5\uff1a\u5916\u9762\u5957 list()<\/code>\uff1alist(map(...))<\/code>\u3002<\/li>\n\n\n\n
      • \u9519\u8bef\u5199\u6cd5\uff1afilter \u7684 lambda \u91cc\u5199 x % 2<\/code>\uff08\u5fd8\u4e86 == 0\uff09 \u2192 \u95ee\u9898\uff1a\u8fd4\u56de\u7684\u662f 0\/1 \u800c\u975e True\/False\uff0c\u5076\u6570\u88ab\u9519\u8bef\u7b5b\u6389 \u2192 \u6b63\u786e\u5199\u6cd5\uff1a\u5199\u5b8c\u6574\u5224\u65ad\uff1ax % 2 == 0<\/code>\u3002<\/li>\n\n\n\n
      • \u9519\u8bef\u5199\u6cd5\uff1a\u5bf9\u5b57\u5178\u7528 map \u6ca1\u6ce8\u610f\u8fed\u4ee3\u7684\u662f\u952e \u2192 \u95ee\u9898\uff1amap \u9ed8\u8ba4\u904d\u5386\u7684\u662f\u5b57\u5178\u7684\u952e<\/strong> \u2192 \u6b63\u786e\u5199\u6cd5\uff1a\u60f3\u5904\u7406\u503c\uff1amap(func, d.values())<\/code>\u3002<\/li>\n<\/ul>\n\n\n\n
        \u8bb0\u5fc6\u53e3\u8bc0<\/strong>\uff1amap \u9010\u4e2a\u6362\u65b0\u989c\uff0cfilter \u5408\u683c\u624d\u653e\u884c\uff1b\u8fed\u4ee3\u5668\u6309\u9700\u7b97\uff0c\u5957\u4e0a list \u624d\u89c1\u5168\u3002<\/p>\n\n\n\n
        4 sorted \u7684 key \u53c2\u6570 \u2014\u2014 \u81ea\u5b9a\u4e49\u6392\u5e8f\u7684\u7075\u9b42<\/h3>\n\n\n\n
        \u662f\u4ec0\u4e48\uff1f\u4e3a\u4ec0\u4e48\u5b66\uff1f<\/strong><\/p>\n\n\n\n
        sorted(\u5bb9\u5668, key=\u51fd\u6570)<\/code> \u4e2d\u7684 key<\/code> \u53c2\u6570\u51b3\u5b9a\u300c\u6309\u4ec0\u4e48\u89c4\u5219\u6392\u5e8f<\/strong>\u300d\uff1a\u9ed8\u8ba4\u6309\u5143\u7d20\u672c\u8eab\u7684\u5927\u5c0f\u6392\uff0c\u800c key \u51fd\u6570\u53ef\u4ee5\u5bf9\u6bcf\u4e2a\u5143\u7d20\u300c\u52a0\u5de5\u51fa\u4e00\u4e2a\u6bd4\u8f83\u4f9d\u636e\u300d\u3002\u6309\u7edd\u5bf9\u503c\u6392\u3001\u5ffd\u7565\u5927\u5c0f\u5199\u6392\u3001\u6309\u5b57\u5178\u67d0\u952e\u6392\u2014\u2014\u5168\u90e8\u9760 key \u5b9e\u73b0\u3002<\/p>\n\n\n\n
        \u5e95\u5c42\u539f\u7406<\/strong><\/p>\n\n\n\n
        sorted \u7684\u6392\u5e8f\u5206\u4e24\u6b65\uff1a\u5148\u5bf9\u6bcf\u4e2a\u5143\u7d20\u8c03\u7528\u4e00\u6b21 key \u51fd\u6570\u5f97\u5230\u300c\u952e\u503c\u300d\uff0c\u7136\u540e\u6309\u952e\u503c\u5927\u5c0f<\/strong>\u5bf9\u539f\u5143\u7d20\u6392\u5e8f\uff08\u5185\u7f6e TimSort \u7b97\u6cd5\uff09\uff0c\u6700\u540e\u8fd4\u56de\u65b0\u5217\u8868\uff08\u539f\u5217\u8868\u4e0d\u88ab\u4fee\u6539\uff09\u3002\u6ce8\u610f key \u53ea\u8d1f\u8d23\u300c\u7b97\u51fa\u6bd4\u8f83\u4f9d\u636e\u300d\uff0c\u771f\u6b63\u6392\u5e8f\u7684\u8fd8\u662f\u539f\u5143\u7d20\u2014\u2014\u6240\u4ee5 sorted(students, key=lambda s: s[\"score\"])<\/code> \u8fd4\u56de\u7684\u4ecd\u662f\u5b8c\u6574\u5b57\u5178\uff0c\u53ea\u662f\u987a\u5e8f\u53d8\u4e86\u3002<\/p>\n\n\n\n
        \u751f\u6d3b\u7c7b\u6bd4<\/strong><\/p>\n\n\n\n
        \u5b66\u6821\u6309\u6210\u7ee9\u6392\u540d\uff1a\u9ed8\u8ba4\u6392\u5e8f<\/strong>\u50cf\u76f4\u63a5\u6309\u300c\u59d3\u540d\u7684\u62fc\u97f3\u5b57\u6bcd\u300d\u6392\uff1bkey \u6392\u5e8f<\/strong>\u50cf\u6309\u300c\u8eab\u9ad8\u300d\u6392\u2014\u2014\u4eba\u8fd8\u662f\u90a3\u4e9b\u4eba\uff08\u5143\u7d20\u4e0d\u53d8\uff09\uff0c\u53ea\u662f\u6392\u961f\u4f9d\u636e\u6362\u6210\u4e86\u522b\u7684\u4e1c\u897f\uff08key \u7b97\u51fa\u7684\u952e\u503c\uff09\u3002\u60f3\u6309\u54ea\u4e2a\u7ef4\u5ea6\u6392\uff0c\u5c31\u544a\u8bc9\u6559\u7ec3\uff08key \u51fd\u6570\uff09\u600e\u4e48\u91cf\u3002<\/p>\n\n\n\n
        \u6ce8\u610f\u4e8b\u9879\u603b\u7ed3<\/strong><\/p>\n\n\n\n
        1 key \u6309\u7edd\u5bf9\u503c\u6392\u5e8f<\/strong>\uff1a<\/p>\n\n\n\n
        nums = [-5, 3, -1, 2]\nprint(sorted(nums))                                    # \u9ed8\u8ba4\u6309\u6570\u503c\nprint(sorted(nums, key=lambda x: abs(x)))              # \u6309\u7edd\u5bf9\u503c\n<\/code><\/pre>\n\n\n\n
        \u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n\n\n\n
        [-5, -1, 2, 3]\n[-1, 2, 3, -5]\n<\/code><\/pre>\n\n\n\n
        \u9ed8\u8ba4\u6392\u5e8f\u6309\u6570\u503c\u5927\u5c0f\uff1a-5 < -1 < 2 < 3\uff1b\u6309\u7edd\u5bf9\u503c\u6392\u65f6\uff0c\u6bcf\u4e2a\u6570\u5148\u53d6\u7edd\u5bf9\u503c\u518d\u6bd4\u8f83\uff1a1\u30012\u30013\u30015\uff0c\u5bf9\u5e94\u539f\u6570\u662f -1\u30012\u30013\u3001-5\u3002key \u53ea\u6539\u53d8\u300c\u6bd4\u8f83\u4f9d\u636e\u300d\uff0c\u7ed3\u679c\u91cc\u8fd8\u662f\u539f\u6765\u7684\u6570\u3002<\/p>\n\n\n\n
        2 key \u5bf9\u5b57\u5178\u5217\u8868\u6309\u6210\u7ee9\u6392\u5e8f\uff08\u6700\u5e38\u7528\u573a\u666f\uff09<\/strong>\uff1a<\/p>\n\n\n\n
        students = [\n    {\"name\": \"\u5c0f\u660e\", \"score\": 92},\n    {\"name\": \"\u5c0f\u7ea2\", \"score\": 88},\n    {\"name\": \"\u5c0f\u521a\", \"score\": 95},\n]\ntop = sorted(students, key=lambda s: s[\"score\"], reverse=True)\nfor s in top:\n    print(s[\"name\"], s[\"score\"])\n<\/code><\/pre>\n\n\n\n
        \u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n\n\n\n
        \u5c0f\u521a 95\n\u5c0f\u660e 92\n\u5c0f\u7ea2 88\n<\/code><\/pre>\n\n\n\n
        key=lambda s: s[\"score\"]<\/code> \u8ba9\u6392\u5e8f\u4f9d\u636e\u662f\u6bcf\u4e2a\u5b57\u5178\u7684 score \u503c\uff1breverse=True<\/code> \u8868\u793a\u4ece\u9ad8\u5230\u4f4e\uff08\u9ed8\u8ba4\u4ece\u5c0f\u5230\u5927\uff09\u3002\u5b57\u5178\u5217\u8868\u6392\u5e8f\u662f\u771f\u5b9e\u9879\u76ee\u91cc\u7684\u9ad8\u9891\u64cd\u4f5c\uff0c\u8fd9\u4e00\u884c\u662f\u6807\u51c6\u7b54\u6848\u3002<\/p>\n\n\n\n
        \u6613\u9519\u70b9<\/strong><\/p>\n\n\n\n
          \n
        • \u9519\u8bef\u5199\u6cd5\uff1asorted(students, key=s[\"score\"])<\/code> \u5c11\u4e86 lambda \u2192 \u95ee\u9898\uff1a\u76f4\u63a5\u62a5 NameError<\/code>\uff0ckey \u8981\u7684\u662f\u4e00\u4e2a\u51fd\u6570<\/strong> \u2192 \u6b63\u786e\u5199\u6cd5\uff1akey=lambda s: s[\"score\"]<\/code>\u3002<\/li>\n\n\n\n
        • \u9519\u8bef\u5199\u6cd5\uff1a\u5fd8\u4e86 reverse=True<\/code> \u60f3\u8981\u4ece\u5927\u5230\u5c0f \u2192 \u95ee\u9898\uff1a\u5f97\u5230\u7684\u662f\u4ece\u5c0f\u5230\u5927 \u2192 \u6b63\u786e\u5199\u6cd5\uff1a\u964d\u5e8f\u52a0 reverse=True<\/code>\u3002<\/li>\n\n\n\n
        • \u9519\u8bef\u5199\u6cd5\uff1a\u4ee5\u4e3a sorted \u4f1a\u4fee\u6539\u539f\u5217\u8868 \u2192 \u95ee\u9898\uff1a\u539f\u5217\u8868\u4e0d\u53d8\uff0c\u8fd4\u56de\u65b0\u5217\u8868<\/strong> \u2192 \u6b63\u786e\u5199\u6cd5\uff1a\u60f3\u539f\u5730\u6392\u5e8f\u7528 \u5217\u8868.sort()<\/code>\u3002<\/li>\n<\/ul>\n\n\n\n
          \u8bb0\u5fc6\u53e3\u8bc0<\/strong>\uff1asorted \u8981\u6392\u5e8f\uff0ckey \u6765\u5b9a\u4f9d\u636e\uff1b\u51fd\u6570\u7b97\u952e\u503c\uff0c\u5143\u7d20\u4e0d\u53d8\u5e8f\uff1b\u964d\u5e8f\u52a0 reverse\uff0c\u65b0\u8868\u4e0d\u4f24\u539f\u3002<\/p>\n\n\n\n
          5 \u9012\u5f52 \u2014\u2014 \u81ea\u5df1\u8c03\u7528\u81ea\u5df1\u7684\u300c\u6808\u300d\u6e38\u620f<\/h3>\n\n\n\n
          \u662f\u4ec0\u4e48\uff1f\u4e3a\u4ec0\u4e48\u5b66\uff1f<\/strong><\/p>\n\n\n\n
          \u9012\u5f52<\/strong>\uff08recursion\uff09\u662f\u51fd\u6570\u5728\u51fd\u6570\u4f53\u91cc\u8c03\u7528\u81ea\u5df1<\/strong>\uff0c\u9002\u5408\u89e3\u51b3\u300c\u5927\u95ee\u9898\u80fd\u62c6\u6210\u540c\u6784\u7684\u5c0f\u95ee\u9898\u300d\u7684\u573a\u666f\uff1a\u9636\u4e58\u3001\u5012\u8ba1\u65f6\u3001\u76ee\u5f55\u904d\u5386\u3001\u6811\u5f62\u7ed3\u6784\uff08Day 20+\uff09\u3002\u7406\u89e3\u9012\u5f52\uff0c\u7b49\u4e8e\u6253\u5f00\u4e86\u300c\u5206\u800c\u6cbb\u4e4b\u300d\u7684\u601d\u7ef4\u5927\u95e8\u3002<\/p>\n\n\n\n
          \u5e95\u5c42\u539f\u7406<\/strong><\/p>\n\n\n\n
          \u6bcf\u6b21\u51fd\u6570\u8c03\u7528\uff0cPython \u90fd\u4f1a\u5728\u8c03\u7528\u6808<\/strong>\uff08call stack\uff09\u4e0a\u538b\u5165\u4e00\u4e2a\u6808\u5e27\uff08\u8bb0\u5f55\u53c2\u6570\u3001\u5c40\u90e8\u53d8\u91cf\u3001\u8fd4\u56de\u4f4d\u7f6e\uff09\u3002\u9012\u5f52\u8c03\u7528\u81ea\u5df1\u65f6\uff0c\u6808\u5e27\u4e00\u5c42\u5c42\u5f80\u4e0a\u53e0\uff1afactorial(5)<\/code> \u2192 factorial(4)<\/code> \u2192 \u2026\u2026 \u76f4\u5230\u9047\u5230\u57fa\u51c6\u6761\u4ef6<\/strong>\uff08base case\uff09\u4e0d\u518d\u8c03\u7528\uff0c\u7136\u540e\u6808\u5e27\u4e00\u5c42\u5c42\u300c\u5f39\u6808\u300d\u8fd4\u56de\u7ed3\u679c\u3002\u6240\u4ee5\u9012\u5f52\u5fc5\u987b\u6ee1\u8db3\u4e24\u6761\uff1a\u2460\u6709\u51fa\u53e3\uff08\u57fa\u51c6\u6761\u4ef6\uff09<\/strong>\uff1b\u2461\u6bcf\u6b21\u8c03\u7528\u8ba9\u95ee\u9898\u53d8\u5c0f<\/strong>\u2014\u2014\u53c2\u6570\u671d\u51fa\u53e3\u65b9\u5411\u903c\u8fd1\u3002\u7f3a\u4e86\u51fa\u53e3\uff0c\u6808\u5e27\u65e0\u9650\u53e0\u52a0\uff0c\u6700\u7ec8\u89e6\u53d1 RecursionError: maximum recursion depth exceeded<\/code>\uff08\u9ed8\u8ba4\u7ea6 1000 \u5c42\uff09\u3002<\/p>\n\n\n\n
          \u751f\u6d3b\u7c7b\u6bd4<\/strong><\/p>\n\n\n\n
          \u9012\u5f52\u50cf\u4fc4\u7f57\u65af\u5957\u5a03<\/strong>\uff1a\u6253\u5f00\u6700\u5916\u9762\u7684\u5927\u5a03\uff0c\u91cc\u9762\u662f\u4e00\u4e2a\u5c0f\u4e00\u53f7\u7684\u5a03\uff0c\u518d\u6253\u5f00\u53c8\u662f\u66f4\u5c0f\u7684\u2026\u2026\u76f4\u5230\u6700\u5c0f\u7684\u90a3\u4e2a\uff08\u57fa\u51c6\u6761\u4ef6\uff09\u2014\u2014\u91cc\u9762\u4ec0\u4e48\u90fd\u6ca1\u6709\u4e86\u3002\u6574\u4e2a\u8fc7\u7a0b\u300c\u4e00\u5c42\u5c42\u6253\u5f00\uff08\u9012\uff09\uff0c\u518d\u4e00\u5c42\u5c42\u5408\u4e0a\uff08\u5f52\uff09\u300d\u3002\u5982\u679c\u5382\u5bb6\u5fd8\u4e86\u505a\u6700\u5c0f\u7684\u5a03\uff08\u6ca1\u6709\u51fa\u53e3\uff09\uff0c\u4f60\u5c31\u6c38\u8fdc\u62c6\u4e0d\u5b8c\u3002<\/p>\n\n\n\n
          \u6ce8\u610f\u4e8b\u9879\u603b\u7ed3<\/strong><\/p>\n\n\n\n
          1 \u9012\u5f52\u7b97\u9636\u4e58\u2014\u2014\u6700\u7ecf\u5178\u7684\u9012\u5f52<\/strong>\uff1a<\/p>\n\n\n\n
          def factorial(n):\n    if n <= 1:                  # \u51fa\u53e3\uff1an \u5230 1 \u5c31\u505c\n        return 1\n    return n * factorial(n - 1)  # \u9012\u8fdb\uff1a\u95ee\u9898\u53d8\u5c0f\uff08n-1\uff09\n\nprint(factorial(5))\n<\/code><\/pre>\n\n\n\n
          \u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n\n\n\n
          120\n<\/code><\/pre>\n\n\n\n
          \u6267\u884c\u8fc7\u7a0b\uff1afactorial(5)<\/code> \u7b97 5 * factorial(4)<\/code>\uff1bfactorial(4)<\/code> \u53c8\u8981\u7b97 4 * factorial(3)<\/code>\u2026\u2026\u4e00\u76f4\u538b\u6808\u5230 factorial(1)<\/code> \u8fd4\u56de 1\uff0c\u518d\u4e00\u5c42\u5c42\u5f39\u6808\u76f8\u4e58\uff1a5\u00d74\u00d73\u00d72\u00d71 = 120\u3002\u51fa\u53e3\uff08n <= 1\uff09\u4fdd\u8bc1\u9012\u5f52\u80fd\u505c\u3002<\/p>\n\n\n\n
          2 \u9012\u5f52\u6c42\u6590\u6ce2\u90a3\u5951\u6570\u5217\uff08\u524d 10 \u9879\uff09<\/strong>\uff1a<\/p>\n\n\n\n
          def fib(n):\n    if n <= 1:                  # \u51fa\u53e3\uff1a\u7b2c 0\u30011 \u9879\u76f4\u63a5\u8fd4\u56de\n        return n\n    return fib(n - 1) + fib(n - 2)   # \u9012\u8fdb\uff1a\u62c6\u6210\u4e24\u4e2a\u66f4\u5c0f\u7684\u5b50\u95ee\u9898\n\nresult = []\nfor i in range(10):\n    result.append(fib(i))\nprint(\" \".join(str(x) for x in result))\n<\/code><\/pre>\n\n\n\n
          \u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n\n\n\n
          0 1 1 2 3 5 8 13 21 34\n<\/code><\/pre>\n\n\n\n
          \u6590\u6ce2\u90a3\u5951\u6570\u5217\u7b2c n \u9879 = \u524d\u4e24\u9879\u4e4b\u548c\uff08\u7b2c 0 \u9879\u662f 0\uff0c\u7b2c 1 \u9879\u662f 1\uff09\u3002fib(5) = fib(4) + fib(3)<\/code>\u2026\u2026\u8fd9\u79cd\u6734\u7d20\u5199\u6cd5\u4f1a\u91cd\u590d\u8ba1\u7b97\u5f88\u591a\u6b21\uff08\u6027\u80fd\u5dee\uff09\uff0c\u4ee5\u540e\u5b66\u4e86\u300c\u8bb0\u5fc6\u5316\u300d\u518d\u4f18\u5316\u3002<\/p>\n\n\n\n
          3 \u9012\u5f52\u5fc5\u987b\u6709\u4e24\u4e2a\u90e8\u5206\u2014\u2014\u51fa\u53e3 + \u9012\u8fdb\uff08\u5012\u8ba1\u65f6\uff09<\/strong>\uff1a<\/p>\n\n\n\n
          def count_down(n):\n    if n <= 0:               # 1. \u51fa\u53e3\uff08\u57fa\u51c6\u6761\u4ef6\uff09\uff1an \u5230 0 \u5c31\u505c\n        print(\"\u53d1\u5c04\uff01\")\n        return\n    print(n)                 # 2. \u9012\u8fdb\uff1a\u6253\u5370\u5f53\u524d\u503c\n    count_down(n - 1)        # \u7136\u540e\u8c03\u7528\u81ea\u5df1\uff0c\u53c2\u6570\u53d8\u5c0f\n\ncount_down(3)\n<\/code><\/pre>\n\n\n\n
          \u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n\n\n\n
          3\n2\n1\n\u53d1\u5c04\uff01\n<\/code><\/pre>\n\n\n\n
          4 \u6ca1\u6709\u51fa\u53e3\u7684\u9012\u5f52\uff08\u9519\u8bef\u793a\u8303\uff0c\u5343\u4e07\u4e0d\u8981\u8fd0\u884c\uff09<\/strong>\uff1a<\/p>\n\n\n\n
          # def forever():\n#     return forever() + 1\n#\n# print(forever())\n# \u4e0a\u9762\u8fd9\u6bb5\u6ca1\u6709\u300c\u51fa\u53e3\u300d\uff0c\u51fd\u6570\u65e0\u9650\u8c03\u7528\u81ea\u5df1\uff0c\u6808\u5e27\u65e0\u9650\u53e0\u52a0\uff0c\n# \u8fd0\u884c\u4f1a\u62a5 RecursionError: maximum recursion depth exceeded\u3002\n# \u4e0d\u5c0f\u5fc3\u8fd0\u884c\u4e86\u65e0\u9650\u9012\u5f52\uff0c\u5728\u7ec8\u7aef\u6309 Ctrl + C \u5f3a\u5236\u7ec8\u6b62\u5373\u53ef\u3002\n<\/code><\/pre>\n\n\n\n
          \u6613\u9519\u70b9<\/strong><\/p>\n\n\n\n
            \n
          • \u9519\u8bef\u5199\u6cd5\uff1a\u9012\u5f52\u51fd\u6570\u6ca1\u6709\u57fa\u51c6\u6761\u4ef6 \u2192 \u95ee\u9898\uff1a\u65e0\u9650\u8c03\u7528\u81ea\u5df1\uff0c\u62a5 RecursionError<\/code> \u2192 \u6b63\u786e\u5199\u6cd5\uff1a\u5148\u5199\u51fa\u53e3\uff1aif \u6761\u4ef6: return \u76f4\u63a5\u7ed3\u679c<\/code>\u3002<\/li>\n\n\n\n
          • \u9519\u8bef\u5199\u6cd5\uff1a\u57fa\u51c6\u6761\u4ef6\u5199\u4e86\u4f46\u6c38\u8fdc\u8fbe\u4e0d\u5230\uff08\u53c2\u6570\u6ca1\u53d8\u5c0f\uff09 \u2192 \u95ee\u9898\uff1a\u540c\u6837 RecursionError \u2192 \u6b63\u786e\u5199\u6cd5\uff1a\u68c0\u67e5\u6bcf\u6b21\u9012\u5f52\u8c03\u7528\u65f6\u53c2\u6570\u662f\u5426\u671d\u51fa\u53e3\u903c\u8fd1\u3002<\/li>\n\n\n\n
          • \u9519\u8bef\u5199\u6cd5\uff1a\u7528\u9012\u5f52\u89e3\u51b3\u7b80\u5355\u5faa\u73af\u95ee\u9898 \u2192 \u95ee\u9898\uff1a\u6027\u80fd\u5dee\u3001\u4ee3\u7801\u7ed5 \u2192 \u6b63\u786e\u5199\u6cd5\uff1a\u80fd\u7528\u5faa\u73af\u5c31\u7528\u5faa\u73af\uff08\u66f4\u7b80\u5355\u3001\u66f4\u5feb\uff09\uff1b\u6811\u5f62\u7ed3\u6784\u7b49\u573a\u666f\u624d\u7528\u9012\u5f52\u3002<\/li>\n<\/ul>\n\n\n\n
            \u8bb0\u5fc6\u53e3\u8bc0<\/strong>\uff1a\u9012\u5f52\u4e24\u4ef6\u5957\uff1a\u51fa\u53e3\u4fdd\u505c\uff0c\u53d8\u5c0f\u903c\u8fd1\uff1b\u53bb\u7a0b\u9012\u3001\u56de\u7a0b\u5f52\uff0c\u6808\u6ee1\u62a5\u9519 RecursionError\u3002<\/p>\n\n\n\n
            6 \u52a8\u624b\u5b9e\u8df5\uff1a\u6392\u5e8f\u4e0e\u8fc7\u6ee4\u5de5\u5177<\/h3>\n\n\n\n
            \u628a\u4eca\u5929\u5b66\u7684\u77e5\u8bc6\u7ec4\u5408\u8d77\u6765\uff0c\u505a\u4e00\u4e2a\u5de5\u5177\u5e93\uff1a\u80fd\u5bf9\u6570\u5b57\u5217\u8868\u6392\u5e8f\uff08\u652f\u6301\u81ea\u5b9a\u4e49\u89c4\u5219\uff09\u3001\u7b5b\u9009\u51fa\u7b26\u5408\u6761\u4ef6\u7684\u6570\u3001\u6279\u91cf\u8f6c\u6362\u6570\u636e\u3002<\/p>\n\n\n\n
            # \u6392\u5e8f\u4e0e\u8fc7\u6ee4\u5de5\u5177\nimport math\n\n\ndef sort_by_abs(nums):\n    \"\"\"\u6309\u7edd\u5bf9\u503c\u4ece\u5c0f\u5230\u5927\u6392\u5e8f\"\"\"\n    return sorted(nums, key=lambda x: abs(x))\n\n\ndef sort_by_len(words):\n    \"\"\"\u6309\u5b57\u7b26\u4e32\u957f\u5ea6\u6392\u5e8f\"\"\"\n    return sorted(words, key=lambda x: len(x))\n\n\ndef filter_by_condition(nums, func):\n    \"\"\"\u6309\u4f20\u5165\u7684\u51fd\u6570\u7b5b\u9009\uff08func \u8fd4\u56de True \u7684\u4fdd\u7559\uff09\"\"\"\n    return list(filter(func, nums))\n\n\ndef double_all(nums):\n    \"\"\"\u628a\u6240\u6709\u6570\u5b57\u7ffb\u500d\"\"\"\n    return list(map(lambda x: x * 2, nums))\n\n\ndef sum_all(*args):\n    \"\"\"\u4efb\u610f\u4e2a\u6570\u6c42\u548c\"\"\"\n    return sum(args)\n\n\n# \u8c03\u7528\u6d4b\u8bd5\nprint(sort_by_abs([-5, 3, -1, 2]))           # [-1, 2, 3, -5]\nprint(sort_by_len([\"abc\", \"a\", \"abcd\", \"ab\"]))  # ['a', 'ab', 'abc', 'abcd']\nprint(filter_by_condition(range(1, 11), lambda x: x % 3 == 0))  # [3, 6, 9]\nprint(double_all([1, 2, 3]))                 # [2, 4, 6]\nprint(sum_all(1, 2, 3, 4))                   # 10\n<\/code><\/pre>\n\n\n\n
            \u5b8c\u6210\u6807\u51c6<\/strong>\uff1a\u6bcf\u4e2a\u51fd\u6570\u8f93\u51fa\u4e0e\u6ce8\u91ca\u4e00\u81f4\u3002\u8fdb\u9636\uff1a\u7528 lambda \u7ed9\u4e00\u7ec4\u5b66\u751f\u6210\u7ee9\u5b57\u5178\u6309\u5206\u6570\u6392\u5e8f\uff0c\u5982 students = [{\"name\": \"\u5c0f\u660e\", \"score\": 92}, {\"name\": \"\u5c0f\u7ea2\", \"score\": 88}]<\/code>\uff0c\u6309 score \u4ece\u9ad8\u5230\u4f4e\u6392\u3002<\/p>\n\n\n\n
            \u4eca\u65e5\u603b\u7ed3<\/strong><\/p>\n\n\n\n
            *args<\/code> \u6253\u5305\u4f4d\u7f6e\u53c2\u6570\u6210\u5143\u7ec4\uff0c**kwargs<\/code> \u6253\u5305\u5173\u952e\u5b57\u53c2\u6570\u6210\u5b57\u5178\uff1b\u8c03\u7528\u65f6 *<\/code> \/ **<\/code> \u8fd8\u53ef\u4ee5\u62c6\u5305\u5c55\u5f00\n\u51fd\u6570\u662f\u4e00\u7b49\u516c\u6c11\uff1a\u53ef\u4ee5\u8d4b\u503c\u3001\u653e\u8fdb\u5bb9\u5668\u3001\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u2014\u2014\u8fd9\u662f map \/ filter \/ sorted \u80fd\u5de5\u4f5c\u7684\u57fa\u7840\nlambda \u9002\u5408\u4e00\u884c\u7b80\u5355\u51fd\u6570\uff1alambda \u53c2\u6570: \u8868\u8fbe\u5f0f<\/code>\uff1b\u903b\u8f91\u590d\u6742\u65f6\u7528 def \u66f4\u6e05\u6670\nmap<\/code> \u9010\u4e2a\u8f6c\u6362\u3001filter<\/code> \u6309\u6761\u4ef6\u7b5b\u9009\uff0c\u8fd4\u56de\u8fed\u4ee3\u5668\uff0c\u8bb0\u5f97\u5957 list()<\/code> \u67e5\u770b\u7ed3\u679c\nsorted<\/code> \u7684 key<\/code> \u53c2\u6570\u51b3\u5b9a\u6392\u5e8f\u4f9d\u636e\uff0creverse=True<\/code> \u964d\u5e8f\uff1b\u539f\u5217\u8868\u4e0d\u88ab\u4fee\u6539\n\u9012\u5f52\u5fc5\u987b\u6709\u51fa\u53e3\uff08\u57fa\u51c6\u6761\u4ef6\uff09\uff0c\u4e14\u6bcf\u6b21\u8c03\u7528\u8981\u8ba9\u95ee\u9898\u53d8\u5c0f\uff1b\u9012\u5f52\u6709\u300c\u53bb\u7a0b\u300d\u548c\u300c\u56de\u7a0b\u300d\u4e24\u4e2a\u9636\u6bb5\n\u80fd\u7528\u5faa\u73af\u4f18\u5148\u7528\u5faa\u73af\uff0c\u9012\u5f52\u7559\u7ed9\u6811\u5f62\u904d\u5386\u7b49\u5929\u7136\u9012\u5f52\u7684\u573a\u666f\n\u5b8c\u6210\u6392\u5e8f\u4e0e\u8fc7\u6ee4\u5de5\u5177\uff0c\u5e76\u5c1d\u8bd5\u7528 lambda \u7ed9\u5b57\u5178\u5217\u8868\u6309\u6210\u7ee9\u6392\u5e8f<\/p>\n\n\n\n
            \u62a5\u9519<\/th>\u539f\u56e0<\/th>\u4fee\u590d<\/th><\/tr><\/thead>
            TypeError: 'map' object is not subscriptable<\/code><\/td>\u5fd8\u4e86\u628a map\/filter \u7ed3\u679c\u8f6c\u6210\u5217\u8868<\/td>\u5916\u9762\u5957 list()<\/code>\uff1alist(map(...))<\/code><\/td><\/tr>
            RecursionError: maximum recursion depth exceeded<\/code><\/td>\u9012\u5f52\u6ca1\u6709\u51fa\u53e3\uff0c\u65e0\u9650\u8c03\u7528\u81ea\u5df1<\/td>\u68c0\u67e5\u9012\u5f52\u51fd\u6570\u662f\u5426\u7f3a\u5c11\u57fa\u51c6\u6761\u4ef6\uff0c\u6216\u6761\u4ef6\u6c38\u8fdc\u4e0d\u6ee1\u8db3<\/td><\/tr>
            TypeError: <lambda>() missing 1 required positional argument<\/code><\/td>lambda \u53c2\u6570\u4e2a\u6570\u548c\u8c03\u7528\u5904\u4e0d\u5339\u914d<\/td>\u68c0\u67e5 lambda \u5199\u4e86\u51e0\u4e2a\u53c2\u6570\u3001\u4f20\u4e86\u51e0\u4e2a\u53c2\u6570<\/td><\/tr>
            SyntaxError: invalid syntax<\/code><\/td>lambda \u540e\u9762\u5199\u4e86\u591a\u884c\u8bed\u53e5\u6216\u7528\u4e86\u8d4b\u503c<\/td>lambda \u53ea\u80fd\u5199\u4e00\u4e2a\u8868\u8fbe\u5f0f\uff0c\u590d\u6742\u903b\u8f91\u6539\u7528 def<\/td><\/tr>
            TypeError: 'int' object is not iterable<\/code><\/td>\u628a\u5355\u4e2a\u6570\u5b57\u4f20\u7ed9\u4e86\u671f\u5f85\u5bb9\u5668\u7684\u51fd\u6570<\/td>\u68c0\u67e5\u5b9e\u53c2\u662f\u5217\u8868\/\u5143\u7ec4\uff0c\u800c\u4e0d\u662f\u5355\u4e2a\u503c<\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"
            1 *args \u4e0e **kwargs \u2014\u2014 \u6253\u5305\u4e0e\u62c6\u5305\u7684\u5bf9\u79f0\u9b54\u6cd5 \u662f\u4ec0\u4e48\uff1f\u4e3a\u4ec0\u4e48\u5b66\uff1f *args \u628a\u300c\u4efb\u610f\u591a\u4e2a […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[16,9],"tags":[],"class_list":["post-84","post","type-post","status-publish","format-standard","hentry","category-python","category-code-dev"],"_links":{"self":[{"href":"https:\/\/ltrainyard.icu\/index.php\/wp-json\/wp\/v2\/posts\/84","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ltrainyard.icu\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ltrainyard.icu\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ltrainyard.icu\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ltrainyard.icu\/index.php\/wp-json\/wp\/v2\/comments?post=84"}],"version-history":[{"count":2,"href":"https:\/\/ltrainyard.icu\/index.php\/wp-json\/wp\/v2\/posts\/84\/revisions"}],"predecessor-version":[{"id":138,"href":"https:\/\/ltrainyard.icu\/index.php\/wp-json\/wp\/v2\/posts\/84\/revisions\/138"}],"wp:attachment":[{"href":"https:\/\/ltrainyard.icu\/index.php\/wp-json\/wp\/v2\/media?parent=84"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ltrainyard.icu\/index.php\/wp-json\/wp\/v2\/categories?post=84"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ltrainyard.icu\/index.php\/wp-json\/wp\/v2\/tags?post=84"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}