{"id":1050016,"date":"2024-12-31T14:04:05","date_gmt":"2024-12-31T06:04:05","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1050016.html"},"modified":"2024-12-31T14:04:07","modified_gmt":"2024-12-31T06:04:07","slug":"python%e4%b8%ad%e5%a6%82%e4%bd%95%e7%a1%ae%e5%ae%9a%e5%ad%97%e7%ac%a6%e4%b8%b2%e9%95%bf%e5%ba%a6","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1050016.html","title":{"rendered":"python\u4e2d\u5982\u4f55\u786e\u5b9a\u5b57\u7b26\u4e32\u957f\u5ea6"},"content":{"rendered":"

\"python\u4e2d\u5982\u4f55\u786e\u5b9a\u5b57\u7b26\u4e32\u957f\u5ea6\"<\/p>\n

\u5728Python\u4e2d\uff0c\u786e\u5b9a\u5b57\u7b26\u4e32\u957f\u5ea6\u7684\u65b9\u6cd5\u6709\u5f88\u591a\uff0c\u6700\u5e38\u7528\u7684\u662f\u4f7f\u7528\u5185\u7f6e\u51fd\u6570len()\u3001\u8ba1\u7b97\u5b57\u7b26\u6570\u91cf\u3001\u4f7f\u7528\u5b57\u7b26\u4e32\u65b9\u6cd5\u7b49<\/strong>\u3002\u5176\u4e2d\uff0c\u6700\u7b80\u5355\u4e5f\u662f\u6700\u5e38\u7528\u7684\u65b9\u6cd5\u662f\u4f7f\u7528\u5185\u7f6e\u51fd\u6570len()\u3002len()\u51fd\u6570\u53ef\u4ee5\u76f4\u63a5\u8fd4\u56de\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\uff0c\u5373\u5b57\u7b26\u4e32\u4e2d\u5b57\u7b26\u7684\u6570\u91cf\u3002\u4e0b\u9762\u6211\u4eec\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u8fd9\u4e9b\u65b9\u6cd5\u53ca\u5176\u5e94\u7528\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528\u5185\u7f6e\u51fd\u6570len()<\/p>\n<\/p>\n

\u4f7f\u7528len()\u51fd\u6570\u662f\u786e\u5b9a\u5b57\u7b26\u4e32\u957f\u5ea6\u7684\u6700\u7b80\u5355\u65b9\u6cd5\u3002\u8fd9\u4e2a\u51fd\u6570\u53ef\u4ee5\u76f4\u63a5\u8fd4\u56de\u5b57\u7b26\u4e32\u4e2d\u7684\u5b57\u7b26\u6570\u91cf\uff0c\u65e0\u8bba\u662f\u5b57\u6bcd\u3001\u6570\u5b57\u8fd8\u662f\u7279\u6b8a\u5b57\u7b26\u3002<\/p>\n<\/p>\n

string = "Hello, World!"<\/p>\n
length = len(string)<\/p>\n
print(length)  # \u8f93\u51fa\uff1a13<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a\u5b57\u7b26\u4e32"Hello, World!"\uff0c\u5e76\u4f7f\u7528len()\u51fd\u6570\u6765\u8ba1\u7b97\u5b83\u7684\u957f\u5ea6\u3002\u7ed3\u679c\u662f13\uff0c\u56e0\u4e3a\u5b57\u7b26\u4e32\u4e2d\u5305\u542b13\u4e2a\u5b57\u7b26\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u8ba1\u7b97\u5b57\u7b26\u6570\u91cf<\/p>\n<\/p>\n
\u9664\u4e86\u4f7f\u7528len()\u51fd\u6570\uff0c\u6211\u4eec\u4e5f\u53ef\u4ee5\u901a\u8fc7\u904d\u5386\u5b57\u7b26\u4e32\u4e2d\u7684\u6bcf\u4e00\u4e2a\u5b57\u7b26\uff0c\u624b\u52a8\u8ba1\u7b97\u5b57\u7b26\u7684\u6570\u91cf\u3002\u867d\u7136\u8fd9\u79cd\u65b9\u6cd5\u4e0d\u5982len()\u51fd\u6570\u7b80\u4fbf\uff0c\u4f46\u5728\u67d0\u4e9b\u7279\u5b9a\u60c5\u51b5\u4e0b\u53ef\u80fd\u4f1a\u66f4\u6709\u7528\u3002<\/p>\n<\/p>\n
string = "Hello, World!"<\/p>\n
length = 0<\/p>\n
for char in string:<\/p>\n
    length += 1<\/p>\n
print(length)  # \u8f93\u51fa\uff1a13<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u4e2a\u4ee3\u7801\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u901a\u8fc7\u904d\u5386\u5b57\u7b26\u4e32\u4e2d\u7684\u6bcf\u4e00\u4e2a\u5b57\u7b26\uff0c\u5e76\u5c06\u8ba1\u6570\u5668length\u52a01\uff0c\u6700\u7ec8\u5f97\u5230\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528\u5b57\u7b26\u4e32\u65b9\u6cd5<\/p>\n<\/p>\n
\u5728\u4e00\u4e9b\u60c5\u51b5\u4e0b\uff0c\u4f7f\u7528\u5b57\u7b26\u4e32\u65b9\u6cd5\u4e5f\u53ef\u4ee5\u786e\u5b9a\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6211\u4eec\u9700\u8981\u8ba1\u7b97\u67d0\u4e2a\u7279\u5b9a\u5b57\u7b26\u5728\u5b57\u7b26\u4e32\u4e2d\u51fa\u73b0\u7684\u6b21\u6570\uff0c\u53ef\u4ee5\u4f7f\u7528\u5b57\u7b26\u4e32\u7684count()\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
string = "Hello, World!"<\/p>\n
count_l = string.count('l')<\/p>\n
print(count_l)  # \u8f93\u51fa\uff1a3<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528count()\u65b9\u6cd5\u6765\u8ba1\u7b97\u5b57\u7b26'l'\u5728\u5b57\u7b26\u4e32\u4e2d\u51fa\u73b0\u7684\u6b21\u6570\u3002\u7ed3\u679c\u662f3\uff0c\u56e0\u4e3a\u5b57\u7b26'l'\u5728\u5b57\u7b26\u4e32\u4e2d\u51fa\u73b0\u4e863\u6b21\u3002<\/p>\n<\/p>\n
\u56db\u3001\u5904\u7406\u591a\u5b57\u8282\u5b57\u7b26<\/p>\n<\/p>\n
\u5728\u5904\u7406\u591a\u5b57\u8282\u5b57\u7b26\uff08\u5982\u6c49\u5b57\u3001\u65e5\u6587\u5b57\u7b26\u7b49\uff09\u65f6\uff0clen()\u51fd\u6570\u4ecd\u7136\u9002\u7528\uff0c\u4f46\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5b83\u4f1a\u8fd4\u56de\u5b57\u7b26\u7684\u6570\u91cf\uff0c\u800c\u4e0d\u662f\u5b57\u8282\u7684\u6570\u91cf\u3002\u5982\u679c\u9700\u8981\u8ba1\u7b97\u5b57\u7b26\u4e32\u7684\u5b57\u8282\u957f\u5ea6\uff0c\u53ef\u4ee5\u4f7f\u7528encode()\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
string = "\u4f60\u597d\uff0c\u4e16\u754c\uff01"<\/p>\n
length = len(string)<\/p>\n
byte_length = len(string.encode('utf-8'))<\/p>\n
print(length)  # \u8f93\u51fa\uff1a6<\/p>\n
print(byte_length)  # \u8f93\u51fa\uff1a18<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u5b57\u7b26\u4e32"\u4f60\u597d\uff0c\u4e16\u754c\uff01"\u5305\u542b6\u4e2a\u5b57\u7b26\uff0c\u4f46\u7531\u4e8e\u6bcf\u4e2a\u6c49\u5b57\u5728UTF-8\u7f16\u7801\u4e0b\u5360\u75283\u4e2a\u5b57\u8282\uff0c\u6240\u4ee5\u5b57\u8282\u957f\u5ea6\u662f18\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u5e94\u7528\u573a\u666f\u4e0e\u5b9e\u8df5<\/p>\n<\/p>\n
\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u786e\u5b9a\u5b57\u7b26\u4e32\u957f\u5ea6\u7684\u9700\u6c42\u975e\u5e38\u5e38\u89c1\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u89c1\u7684\u5e94\u7528\u573a\u666f\uff1a<\/p>\n<\/p>\n
    \n
  1. \u9a8c\u8bc1\u7528\u6237\u8f93\u5165<\/strong>\uff1a\u5728\u7528\u6237\u6ce8\u518c\u6216\u586b\u5199\u8868\u5355\u65f6\uff0c\u901a\u5e38\u9700\u8981\u9650\u5236\u7528\u6237\u540d\u6216\u5bc6\u7801\u7684\u957f\u5ea6\u3002\u53ef\u4ee5\u4f7f\u7528len()\u51fd\u6570\u6765\u9a8c\u8bc1\u8f93\u5165\u7684\u957f\u5ea6\u662f\u5426\u7b26\u5408\u8981\u6c42\u3002<\/li>\n<\/ol>\n
    username = input("Enter your username: ")<\/p>\n
    if len(username) < 5:<\/p>\n
        print("Username must be at least 5 characters long.")<\/p>\n
    else:<\/p>\n
        print("Username is valid.")<\/p>\n
    <\/code><\/pre>\n<\/p>\n
      \n
    1. \u5904\u7406\u591a\u8bed\u8a00\u6587\u672c<\/strong>\uff1a\u5728\u5904\u7406\u591a\u8bed\u8a00\u6587\u672c\u65f6\uff0c\u9700\u8981\u6ce8\u610f\u5b57\u7b26\u7f16\u7801\u548c\u5b57\u8282\u957f\u5ea6\u3002\u4f8b\u5982\uff0c\u5728\u53d1\u9001\u77ed\u4fe1\u6216\u63a8\u9001\u901a\u77e5\u65f6\uff0c\u901a\u5e38\u4f1a\u9650\u5236\u6d88\u606f\u7684\u5b57\u8282\u957f\u5ea6\u3002<\/li>\n<\/ol>\n
      message = "\u4f60\u597d\uff0c\u4e16\u754c\uff01"<\/p>\n
      max_bytes = 20<\/p>\n
      if len(message.encode('utf-8')) > max_bytes:<\/p>\n
          print("Message is too long.")<\/p>\n
      else:<\/p>\n
          print("Message is within the byte limit.")<\/p>\n
      <\/code><\/pre>\n<\/p>\n
        \n
      1. \u6587\u672c\u5904\u7406\u4e0e\u5206\u6790<\/strong>\uff1a\u5728\u8fdb\u884c\u6587\u672c\u5904\u7406\u4e0e\u5206\u6790\u65f6\uff0c\u786e\u5b9a\u5b57\u7b26\u4e32\u957f\u5ea6\u662f\u4e00\u4e2a\u57fa\u672c\u64cd\u4f5c\u3002\u4f8b\u5982\uff0c\u5728\u81ea\u7136\u8bed\u8a00\u5904\u7406\uff08NLP\uff09\u4efb\u52a1\u4e2d\uff0c\u901a\u5e38\u9700\u8981\u8ba1\u7b97\u6587\u672c\u7684\u957f\u5ea6\uff0c\u4ee5\u4fbf\u8fdb\u884c\u8fdb\u4e00\u6b65\u7684\u5904\u7406\u548c\u5206\u6790\u3002<\/li>\n<\/ol>\n
        text = "This is a sample text for analysis."<\/p>\n
        word_count = len(text.split())<\/p>\n
        print(f"The text contAI<\/a>ns {word_count} words.")<\/p>\n
        <\/code><\/pre>\n<\/p>\n
        \u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528split()\u65b9\u6cd5\u5c06\u6587\u672c\u6309\u7a7a\u683c\u5206\u5272\u6210\u5355\u8bcd\u5217\u8868\uff0c\u7136\u540e\u4f7f\u7528len()\u51fd\u6570\u8ba1\u7b97\u5355\u8bcd\u7684\u6570\u91cf\u3002<\/p>\n<\/p>\n
        \u516d\u3001\u603b\u7ed3<\/p>\n<\/p>\n
        \u901a\u8fc7\u672c\u6587\uff0c\u6211\u4eec\u8be6\u7ec6\u4ecb\u7ecd\u4e86\u5728Python\u4e2d\u786e\u5b9a\u5b57\u7b26\u4e32\u957f\u5ea6\u7684\u591a\u79cd\u65b9\u6cd5\uff0c\u5305\u62ec\u4f7f\u7528\u5185\u7f6e\u51fd\u6570len()\u3001\u8ba1\u7b97\u5b57\u7b26\u6570\u91cf\u3001\u4f7f\u7528\u5b57\u7b26\u4e32\u65b9\u6cd5\u4ee5\u53ca\u5904\u7406\u591a\u5b57\u8282\u5b57\u7b26\u3002\u6700\u5e38\u7528\u7684\u65b9\u6cd5\u662f\u4f7f\u7528len()\u51fd\u6570\uff0c\u56e0\u4e3a\u5b83\u7b80\u5355\u4e14\u9ad8\u6548<\/strong>\u3002\u6b64\u5916\uff0c\u6211\u4eec\u8fd8\u8ba8\u8bba\u4e86\u786e\u5b9a\u5b57\u7b26\u4e32\u957f\u5ea6\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\u7684\u4e00\u4e9b\u5e38\u89c1\u573a\u666f\uff0c\u5982\u9a8c\u8bc1\u7528\u6237\u8f93\u5165\u3001\u5904\u7406\u591a\u8bed\u8a00\u6587\u672c\u4ee5\u53ca\u6587\u672c\u5904\u7406\u4e0e\u5206\u6790\u3002<\/p>\n<\/p>\n
        \u5728\u5b9e\u9645\u7f16\u7a0b\u4e2d\uff0c\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u6765\u786e\u5b9a\u5b57\u7b26\u4e32\u957f\u5ea6\u53d6\u51b3\u4e8e\u5177\u4f53\u7684\u5e94\u7528\u9700\u6c42\u3002\u5e0c\u671b\u672c\u6587\u80fd\u4e3a\u60a8\u63d0\u4f9b\u6709\u4ef7\u503c\u7684\u53c2\u8003\uff0c\u5e2e\u52a9\u60a8\u66f4\u597d\u5730\u7406\u89e3\u548c\u5e94\u7528\u8fd9\u4e9b\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
        \u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
         \u5982\u4f55\u5728Python\u4e2d\u8ba1\u7b97\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\uff1f<\/strong>
        \u5728Python\u4e2d\uff0c\u8ba1\u7b97\u5b57\u7b26\u4e32\u957f\u5ea6\u975e\u5e38\u7b80\u5355\u3002\u60a8\u53ef\u4ee5\u4f7f\u7528\u5185\u7f6e\u7684len()<\/code>\u51fd\u6570\u6765\u83b7\u53d6\u5b57\u7b26\u4e32\u4e2d\u7684\u5b57\u7b26\u6570\u3002\u4f8b\u5982\uff0clen("Hello, World!")<\/code>\u5c06\u8fd4\u56de13\uff0c\u56e0\u4e3a\u5305\u542b\u7a7a\u683c\u548c\u6807\u70b9\u7b26\u53f7\u5728\u5185\u7684\u5b57\u7b26\u603b\u6570\u4e3a13\u3002<\/p>\n
        \u5b57\u7b26\u4e32\u957f\u5ea6\u7684\u8ba1\u7b97\u662f\u5426\u4f1a\u8003\u8651\u7a7a\u683c\u548c\u7279\u6b8a\u5b57\u7b26\uff1f<\/strong>
        \u662f\u7684\uff0cPython\u4e2d\u7684len()<\/code>\u51fd\u6570\u4f1a\u5c06\u7a7a\u683c\u548c\u7279\u6b8a\u5b57\u7b26\u89c6\u4e3a\u5b57\u7b26\u4e32\u7684\u4e00\u90e8\u5206\u3002\u56e0\u6b64\uff0c\u5982\u679c\u60a8\u7684\u5b57\u7b26\u4e32\u5305\u542b\u7a7a\u683c\u6216\u7279\u6b8a\u7b26\u53f7\uff0c\u8fd9\u4e9b\u4e5f\u4f1a\u88ab\u8ba1\u5165\u603b\u957f\u5ea6\u3002\u4f8b\u5982\uff0clen("Hello World!")<\/code>\u5c06\u8fd4\u56de12\uff0c\u56e0\u4e3a\u5b83\u5305\u62ec\u4e00\u4e2a\u7a7a\u683c\u548c\u4e00\u4e2a\u611f\u53f9\u53f7\u3002<\/p>\n
        \u5982\u4f55\u5904\u7406\u5305\u542bUnicode\u5b57\u7b26\u7684\u5b57\u7b26\u4e32\u957f\u5ea6\uff1f<\/strong>
        \u5bf9\u4e8e\u5305\u542bUnicode\u5b57\u7b26\u7684\u5b57\u7b26\u4e32\uff0clen()<\/code>\u51fd\u6570\u540c\u6837\u53ef\u4ee5\u6b63\u5e38\u5de5\u4f5c\u3002\u5b83\u4f1a\u8ba1\u7b97\u5b9e\u9645\u7684\u5b57\u7b26\u6570\u91cf\uff0c\u800c\u4e0d\u662f\u5b57\u8282\u6570\u3002\u8fd9\u5bf9\u4e8e\u591a\u8bed\u8a00\u652f\u6301\u975e\u5e38\u91cd\u8981\u3002\u4f8b\u5982\uff0clen("\u4f60\u597d")<\/code>\u5c06\u8fd4\u56de2\uff0c\u56e0\u4e3a\u8fd9\u4e2a\u5b57\u7b26\u4e32\u5305\u542b\u4e24\u4e2a\u6c49\u5b57\u5b57\u7b26\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Python\u4e2d\uff0c\u786e\u5b9a\u5b57\u7b26\u4e32\u957f\u5ea6\u7684\u65b9\u6cd5\u6709\u5f88\u591a\uff0c\u6700\u5e38\u7528\u7684\u662f\u4f7f\u7528\u5185\u7f6e\u51fd\u6570len()\u3001\u8ba1\u7b97\u5b57\u7b26\u6570\u91cf\u3001\u4f7f\u7528\u5b57\u7b26\u4e32\u65b9\u6cd5\u7b49 […]","protected":false},"author":3,"featured_media":1050024,"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\/1050016"}],"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=1050016"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1050016\/revisions"}],"predecessor-version":[{"id":1050025,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1050016\/revisions\/1050025"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1050024"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1050016"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1050016"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1050016"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}