{"id":1159621,"date":"2025-01-13T18:55:00","date_gmt":"2025-01-13T10:55:00","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1159621.html"},"modified":"2025-01-13T18:55:03","modified_gmt":"2025-01-13T10:55:03","slug":"python%e6%95%b0%e7%bb%84%e4%b8%ba%e7%a9%ba%e5%a6%82%e4%bd%95%e5%88%a4%e6%96%ad","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1159621.html","title":{"rendered":"python\u6570\u7ec4\u4e3a\u7a7a\u5982\u4f55\u5224\u65ad"},"content":{"rendered":"

\"python\u6570\u7ec4\u4e3a\u7a7a\u5982\u4f55\u5224\u65ad\"<\/p>\n

\u5728Python\u4e2d\u5224\u65ad\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u7684\u51e0\u79cd\u65b9\u6cd5\u5305\u62eclen()\u51fd\u6570\u3001\u76f4\u63a5\u5224\u65ad\u3001not\u8fd0\u7b97\u7b26\u3001Numpy\u5e93<\/strong>\u7b49\u3002len()\u51fd\u6570<\/strong>\u662f\u6700\u5e38\u7528\u7684\u65b9\u6cd5\uff0c\u4ee5\u4e0b\u662f\u5bf9\u5b83\u7684\u8be6\u7ec6\u63cf\u8ff0\u3002\u4f7f\u7528len()\u51fd\u6570\u5224\u65ad\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u662f\u6700\u7b80\u5355\u4e14\u76f4\u89c2\u7684\u65b9\u6cd5\u3002len()\u51fd\u6570\u4f1a\u8fd4\u56de\u6570\u7ec4\u7684\u957f\u5ea6\uff0c\u5982\u679c\u957f\u5ea6\u4e3a0\uff0c\u5219\u6570\u7ec4\u4e3a\u7a7a\u3002<\/p>\n<\/p>\n

\u4e00\u3001len()\u51fd\u6570<\/h3>\n<\/p>\n

\u4f7f\u7528len()\u51fd\u6570\u5224\u65ad\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u662f\u6700\u5e38\u89c1\u4e14\u76f4\u89c2\u7684\u65b9\u6cd5\u3002len()\u51fd\u6570\u53ef\u4ee5\u8fd4\u56de\u6570\u7ec4\u7684\u957f\u5ea6\uff0c\u5982\u679c\u6570\u7ec4\u7684\u957f\u5ea6\u4e3a0\uff0c\u5219\u6570\u7ec4\u4e3a\u7a7a\u3002<\/p>\n<\/p>\n

arr = []<\/p>\n
if len(arr) == 0:<\/p>\n
    print("Array is empty")<\/p>\n
else:<\/p>\n
    print("Array is not empty")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u9996\u5148\u5b9a\u4e49\u4e86\u4e00\u4e2a\u7a7a\u7684\u6570\u7ec4arr<\/code>\uff0c\u7136\u540e\u901a\u8fc7len(arr)<\/code>\u83b7\u53d6\u6570\u7ec4\u7684\u957f\u5ea6\u3002\u5982\u679c\u6570\u7ec4\u7684\u957f\u5ea6\u4e3a0\uff0c\u5219\u8f93\u51fa"Array is empty"\uff0c\u5426\u5219\u8f93\u51fa"Array is not empty"\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u76f4\u63a5\u5224\u65ad<\/h3>\n<\/p>\n
\u53e6\u4e00\u79cd\u65b9\u6cd5\u662f\u76f4\u63a5\u5224\u65ad\u6570\u7ec4\u672c\u8eab\u3002\u5728Python\u4e2d\uff0c\u7a7a\u6570\u7ec4\u88ab\u8ba4\u4e3a\u662fFalse<\/code>\uff0c\u975e\u7a7a\u6570\u7ec4\u88ab\u8ba4\u4e3a\u662fTrue<\/code>\u3002\u56e0\u6b64\uff0c\u6211\u4eec\u53ef\u4ee5\u76f4\u63a5\u5728\u6761\u4ef6\u8bed\u53e5\u4e2d\u5224\u65ad\u6570\u7ec4\u3002<\/p>\n<\/p>\n
arr = []<\/p>\n
if not arr:<\/p>\n
    print("Array is empty")<\/p>\n
else:<\/p>\n
    print("Array is not empty")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528\u4e86not<\/code>\u8fd0\u7b97\u7b26\u6765\u5224\u65ad\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u3002\u5982\u679c\u6570\u7ec4\u4e3a\u7a7a\uff0cnot arr<\/code>\u4e3aTrue<\/code>\uff0c\u5219\u8f93\u51fa"Array is empty"\uff0c\u5426\u5219\u8f93\u51fa"Array is not empty"\u3002<\/p>\n<\/p>\n
\u4e09\u3001Numpy\u5e93<\/h3>\n<\/p>\n
\u5bf9\u4e8e\u4f7f\u7528Numpy\u5e93\u7684\u6570\u7ec4\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528Numpy\u7684size<\/code>\u5c5e\u6027\u6765\u5224\u65ad\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u3002Numpy\u662f\u4e00\u4e2a\u5f3a\u5927\u7684\u6570\u503c\u8ba1\u7b97\u5e93\uff0c\u5e7f\u6cdb\u5e94\u7528\u4e8e\u6570\u636e\u79d1\u5b66\u548c\u673a\u5668\u5b66\u4e60<\/a>\u9886\u57df\u3002<\/p>\n<\/p>\n
import numpy as np<\/p>\n
arr = np.array([])<\/p>\n
if arr.size == 0:<\/p>\n
    print("Array is empty")<\/p>\n
else:<\/p>\n
    print("Array is not empty")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u9996\u5148\u5bfc\u5165\u4e86Numpy\u5e93\uff0c\u5e76\u521b\u5efa\u4e86\u4e00\u4e2a\u7a7a\u7684Numpy\u6570\u7ec4arr<\/code>\u3002\u901a\u8fc7arr.size<\/code>\u83b7\u53d6\u6570\u7ec4\u7684\u5927\u5c0f\uff0c\u5982\u679c\u6570\u7ec4\u7684\u5927\u5c0f\u4e3a0\uff0c\u5219\u8f93\u51fa"Array is empty"\uff0c\u5426\u5219\u8f93\u51fa"Array is not empty"\u3002<\/p>\n<\/p>\n
\u56db\u3001\u5224\u65ad\u591a\u7ef4\u6570\u7ec4<\/h3>\n<\/p>\n
\u5728\u5224\u65ad\u591a\u7ef4\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u65f6\uff0c\u4f7f\u7528len()<\/code>\u51fd\u6570\u548cNumpy\u5e93\u7684\u65b9\u6cd5\u4ecd\u7136\u9002\u7528\uff0c\u4f46\u9700\u8981\u6ce8\u610f\u591a\u7ef4\u6570\u7ec4\u7684\u7ed3\u6784\u3002<\/p>\n<\/p>\n
import numpy as np<\/p>\n
arr = np.array([[]])<\/p>\n
if arr.size == 0:<\/p>\n
    print("Array is empty")<\/p>\n
else:<\/p>\n
    print("Array is not empty")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u521b\u5efa\u4e86\u4e00\u4e2a\u4e8c\u7ef4\u7a7a\u6570\u7ec4arr<\/code>\uff0c\u5e76\u901a\u8fc7arr.size<\/code>\u5224\u65ad\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u3002\u5982\u679c\u6570\u7ec4\u7684\u5927\u5c0f\u4e3a0\uff0c\u5219\u8f93\u51fa"Array is empty"\uff0c\u5426\u5219\u8f93\u51fa"Array is not empty"\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u7a7a\u5217\u8868\u7684\u5b9e\u9645\u5e94\u7528<\/h3>\n<\/p>\n
\u5224\u65ad\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\u975e\u5e38\u91cd\u8981\u3002\u4f8b\u5982\uff0c\u5728\u6570\u636e\u5904\u7406\u8fc7\u7a0b\u4e2d\uff0c\u6211\u4eec\u53ef\u80fd\u9700\u8981\u5904\u7406\u5927\u91cf\u7684\u6570\u636e\u6570\u7ec4\uff0c\u5e76\u5728\u6bcf\u4e2a\u6b65\u9aa4\u4e2d\u5224\u65ad\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\uff0c\u4ee5\u786e\u4fdd\u4ee3\u7801\u7684\u6b63\u786e\u6027\u548c\u5065\u58ee\u6027\u3002<\/p>\n<\/p>\n
    \n
  1. \u6570\u636e\u6e05\u6d17<\/li>\n<\/ol>\n
    \u5728\u6570\u636e\u6e05\u6d17\u8fc7\u7a0b\u4e2d\uff0c\u6211\u4eec\u9700\u8981\u5904\u7406\u5927\u91cf\u7684\u6570\u636e\u6570\u7ec4\uff0c\u5e76\u6839\u636e\u6570\u636e\u7684\u7279\u6027\u8fdb\u884c\u76f8\u5e94\u7684\u5904\u7406\u3002\u5224\u65ad\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u8fc7\u6ee4\u6389\u65e0\u6548\u7684\u6570\u636e\uff0c\u786e\u4fdd\u6570\u636e\u7684\u8d28\u91cf\u3002<\/p>\n<\/p>\n
    data = [[], [1, 2, 3], [], [4, 5, 6]]<\/p>\n
    cleaned_data = [arr for arr in data if len(arr) > 0]<\/p>\n
    print(cleaned_data)<\/p>\n
    <\/code><\/pre>\n<\/p>\n
    \u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a\u5305\u542b\u591a\u4e2a\u6570\u7ec4\u7684\u5217\u8868data<\/code>\uff0c\u5e76\u901a\u8fc7\u5217\u8868\u63a8\u5bfc\u5f0f\u8fc7\u6ee4\u6389\u7a7a\u6570\u7ec4\uff0c\u5f97\u5230\u6e05\u6d17\u540e\u7684\u6570\u636ecleaned_data<\/code>\u3002<\/p>\n<\/p>\n
      \n
    1. \u6570\u636e\u5206\u6790<\/li>\n<\/ol>\n
      \u5728\u6570\u636e\u5206\u6790\u8fc7\u7a0b\u4e2d\uff0c\u6211\u4eec\u53ef\u80fd\u9700\u8981\u5bf9\u591a\u4e2a\u6570\u636e\u6570\u7ec4\u8fdb\u884c\u7edf\u8ba1\u5206\u6790\u3002\u5224\u65ad\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u6392\u9664\u65e0\u6548\u7684\u6570\u636e\uff0c\u786e\u4fdd\u5206\u6790\u7ed3\u679c\u7684\u51c6\u786e\u6027\u3002<\/p>\n<\/p>\n
      data = [[], [1, 2, 3], [], [4, 5, 6]]<\/p>\n
      for arr in data:<\/p>\n
          if len(arr) > 0:<\/p>\n
              print(f"Mean: {sum(arr) \/ len(arr)}")<\/p>\n
      <\/code><\/pre>\n<\/p>\n
      \u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a\u5305\u542b\u591a\u4e2a\u6570\u7ec4\u7684\u5217\u8868data<\/code>\uff0c\u5e76\u901a\u8fc7\u5faa\u73af\u904d\u5386\u6bcf\u4e2a\u6570\u7ec4\uff0c\u5bf9\u975e\u7a7a\u6570\u7ec4\u8fdb\u884c\u5747\u503c\u8ba1\u7b97\u5e76\u8f93\u51fa\u7ed3\u679c\u3002<\/p>\n<\/p>\n
      \u516d\u3001Python\u4e2d\u7684\u7a7a\u6570\u7ec4\u64cd\u4f5c<\/h3>\n<\/p>\n
      \u5728\u5b9e\u9645\u7f16\u7a0b\u4e2d\uff0c\u64cd\u4f5c\u7a7a\u6570\u7ec4\u4e5f\u662f\u975e\u5e38\u5e38\u89c1\u7684\u3002\u4f8b\u5982\u5728\u6570\u636e\u5904\u7406\u548c\u79d1\u5b66\u8ba1\u7b97\u4e2d\uff0c\u5f80\u5f80\u9700\u8981\u5904\u7406\u7a7a\u6570\u7ec4\u7684\u60c5\u51b5\u3002\u8fd9\u91cc\u4ecb\u7ecd\u4e00\u4e9b\u4e0e\u7a7a\u6570\u7ec4\u76f8\u5173\u7684\u64cd\u4f5c\u548c\u6ce8\u610f\u4e8b\u9879\u3002<\/p>\n<\/p>\n
      1. \u6dfb\u52a0\u5143\u7d20<\/h4>\n<\/p>\n
      \u5411\u7a7a\u6570\u7ec4\u4e2d\u6dfb\u52a0\u5143\u7d20\u662f\u6700\u5e38\u89c1\u7684\u64cd\u4f5c\u4e4b\u4e00\u3002\u53ef\u4ee5\u4f7f\u7528append()<\/code>\u65b9\u6cd5\u6216extend()<\/code>\u65b9\u6cd5\u6765\u5b9e\u73b0\u3002<\/p>\n<\/p>\n
      arr = []<\/p>\n
      arr.append(1)<\/p>\n
      arr.extend([2, 3])<\/p>\n
      print(arr)  # \u8f93\u51fa [1, 2, 3]<\/p>\n
      <\/code><\/pre>\n<\/p>\n
      \u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u9996\u5148\u521b\u5efa\u4e86\u4e00\u4e2a\u7a7a\u6570\u7ec4arr<\/code>\uff0c\u7136\u540e\u4f7f\u7528append()<\/code>\u65b9\u6cd5\u6dfb\u52a0\u5355\u4e2a\u5143\u7d201\uff0c\u4f7f\u7528extend()<\/code>\u65b9\u6cd5\u6dfb\u52a0\u591a\u4e2a\u5143\u7d202\u548c3\uff0c\u6700\u540e\u8f93\u51fa\u6570\u7ec4\u7684\u5185\u5bb9\u3002<\/p>\n<\/p>\n
      2. \u5220\u9664\u5143\u7d20<\/h4>\n<\/p>\n
      \u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u53ef\u80fd\u9700\u8981\u4ece\u6570\u7ec4\u4e2d\u5220\u9664\u5143\u7d20\u3002\u53ef\u4ee5\u4f7f\u7528remove()<\/code>\u65b9\u6cd5\u6216pop()<\/code>\u65b9\u6cd5\u6765\u5b9e\u73b0\u3002<\/p>\n<\/p>\n
      arr = [1, 2, 3]<\/p>\n
      arr.remove(2)<\/p>\n
      print(arr)  # \u8f93\u51fa [1, 3]<\/p>\n
      arr.pop()<\/p>\n
      print(arr)  # \u8f93\u51fa [1]<\/p>\n
      <\/code><\/pre>\n<\/p>\n
      \u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u9996\u5148\u521b\u5efa\u4e86\u4e00\u4e2a\u5305\u542b\u5143\u7d201\u30012\u30013\u7684\u6570\u7ec4arr<\/code>\uff0c\u7136\u540e\u4f7f\u7528remove()<\/code>\u65b9\u6cd5\u5220\u9664\u5143\u7d202\uff0c\u4f7f\u7528pop()<\/code>\u65b9\u6cd5\u5220\u9664\u6700\u540e\u4e00\u4e2a\u5143\u7d20\uff0c\u6700\u540e\u8f93\u51fa\u6570\u7ec4\u7684\u5185\u5bb9\u3002<\/p>\n<\/p>\n
      3. \u6570\u7ec4\u62fc\u63a5<\/h4>\n<\/p>\n
      \u5728\u6570\u636e\u5904\u7406\u8fc7\u7a0b\u4e2d\uff0c\u6211\u4eec\u53ef\u80fd\u9700\u8981\u5c06\u591a\u4e2a\u6570\u7ec4\u62fc\u63a5\u6210\u4e00\u4e2a\u6570\u7ec4\u3002\u53ef\u4ee5\u4f7f\u7528+<\/code>\u64cd\u4f5c\u7b26\u6216extend()<\/code>\u65b9\u6cd5\u6765\u5b9e\u73b0\u3002<\/p>\n<\/p>\n
      arr1 = [1, 2]<\/p>\n
      arr2 = [3, 4]<\/p>\n
      arr3 = arr1 + arr2<\/p>\n
      print(arr3)  # \u8f93\u51fa [1, 2, 3, 4]<\/p>\n
      arr1.extend(arr2)<\/p>\n
      print(arr1)  # \u8f93\u51fa [1, 2, 3, 4]<\/p>\n
      <\/code><\/pre>\n<\/p>\n
      \u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u9996\u5148\u521b\u5efa\u4e86\u4e24\u4e2a\u6570\u7ec4arr1<\/code>\u548carr2<\/code>\uff0c\u7136\u540e\u4f7f\u7528+<\/code>\u64cd\u4f5c\u7b26\u5c06\u4e24\u4e2a\u6570\u7ec4\u62fc\u63a5\u6210\u4e00\u4e2a\u65b0\u6570\u7ec4arr3<\/code>\uff0c\u4f7f\u7528extend()<\/code>\u65b9\u6cd5\u5c06arr2<\/code>\u7684\u5185\u5bb9\u6dfb\u52a0\u5230arr1<\/code>\u4e2d\uff0c\u6700\u540e\u8f93\u51fa\u6570\u7ec4\u7684\u5185\u5bb9\u3002<\/p>\n<\/p>\n
      \u4e03\u3001\u4f7f\u7528\u7a7a\u6570\u7ec4\u63d0\u9ad8\u4ee3\u7801\u5065\u58ee\u6027<\/h3>\n<\/p>\n
      \u5728\u7f16\u5199\u4ee3\u7801\u65f6\uff0c\u5904\u7406\u7a7a\u6570\u7ec4\u53ef\u4ee5\u63d0\u9ad8\u4ee3\u7801\u7684\u5065\u58ee\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002\u901a\u8fc7\u5408\u7406\u7684\u7a7a\u6570\u7ec4\u5224\u65ad\u548c\u64cd\u4f5c\uff0c\u53ef\u4ee5\u907f\u514d\u7a0b\u5e8f\u56e0\u7a7a\u6570\u7ec4\u5f15\u53d1\u7684\u9519\u8bef\uff0c\u5e76\u63d0\u9ad8\u4ee3\u7801\u7684\u5bb9\u9519\u6027\u3002<\/p>\n<\/p>\n
      1. \u9519\u8bef\u5904\u7406<\/h4>\n<\/p>\n
      \u5728\u5904\u7406\u6570\u7ec4\u64cd\u4f5c\u65f6\uff0c\u5408\u7406\u7684\u9519\u8bef\u5904\u7406\u53ef\u4ee5\u907f\u514d\u56e0\u7a7a\u6570\u7ec4\u5f15\u53d1\u7684\u5f02\u5e38\u3002\u4f8b\u5982\uff0c\u5728\u8ba1\u7b97\u6570\u7ec4\u5747\u503c\u65f6\uff0c\u53ef\u4ee5\u5148\u5224\u65ad\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\uff0c\u907f\u514d\u9664\u96f6\u9519\u8bef\u3002<\/p>\n<\/p>\n
      arr = []<\/p>\n
      if len(arr) > 0:<\/p>\n
          mean = sum(arr) \/ len(arr)<\/p>\n
          print(f"Mean: {mean}")<\/p>\n
      else:<\/p>\n
          print("Array is empty, cannot calculate mean.")<\/p>\n
      <\/code><\/pre>\n<\/p>\n
      \u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u5148\u5224\u65ad\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\uff0c\u5982\u679c\u6570\u7ec4\u4e0d\u4e3a\u7a7a\uff0c\u5219\u8ba1\u7b97\u5e76\u8f93\u51fa\u5747\u503c\uff1b\u5426\u5219\u8f93\u51fa\u63d0\u793a\u4fe1\u606f\uff0c\u907f\u514d\u9664\u96f6\u9519\u8bef\u3002<\/p>\n<\/p>\n
      2. \u6570\u636e\u9a8c\u8bc1<\/h4>\n<\/p>\n
      \u5728\u5904\u7406\u5916\u90e8\u6570\u636e\u65f6\uff0c\u53ef\u4ee5\u901a\u8fc7\u7a7a\u6570\u7ec4\u5224\u65ad\u8fdb\u884c\u6570\u636e\u9a8c\u8bc1\uff0c\u786e\u4fdd\u6570\u636e\u7684\u5b8c\u6574\u6027\u548c\u6709\u6548\u6027\u3002\u4f8b\u5982\uff0c\u5728\u4ece\u6587\u4ef6\u8bfb\u53d6\u6570\u636e\u65f6\uff0c\u53ef\u4ee5\u5148\u5224\u65ad\u8bfb\u53d6\u7ed3\u679c\u662f\u5426\u4e3a\u7a7a\uff0c\u518d\u8fdb\u884c\u540e\u7eed\u5904\u7406\u3002<\/p>\n<\/p>\n
      data = []<\/p>\n
      with open('data.txt', 'r') as file:<\/p>\n
          for line in file:<\/p>\n
              data.append(line.strip())<\/p>\n
      if len(data) > 0:<\/p>\n
          print("Data read successfully.")<\/p>\n
      else:<\/p>\n
          print("No data found in the file.")<\/p>\n
      <\/code><\/pre>\n<\/p>\n
      \u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u4ece\u6587\u4ef6data.txt<\/code>\u4e2d\u8bfb\u53d6\u6570\u636e\uff0c\u5e76\u5c06\u6bcf\u884c\u6570\u636e\u6dfb\u52a0\u5230\u6570\u7ec4data<\/code>\u4e2d\u3002\u8bfb\u53d6\u5b8c\u6210\u540e\uff0c\u5224\u65ad\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\uff0c\u8f93\u51fa\u76f8\u5e94\u7684\u63d0\u793a\u4fe1\u606f\u3002<\/p>\n<\/p>\n
      \u516b\u3001\u603b\u7ed3<\/h3>\n<\/p>\n
      \u5224\u65adPython\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u7684\u65b9\u6cd5\u5305\u62eclen()\u51fd\u6570\u3001\u76f4\u63a5\u5224\u65ad\u3001not\u8fd0\u7b97\u7b26\u3001Numpy\u5e93<\/strong>\u7b49\u3002\u4f7f\u7528len()<\/code>\u51fd\u6570\u662f\u6700\u5e38\u7528\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u901a\u8fc7\u5224\u65ad\u6570\u7ec4\u7684\u957f\u5ea6\u662f\u5426\u4e3a0\u6765\u786e\u5b9a\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u3002\u76f4\u63a5\u5224\u65ad\u6570\u7ec4\u672c\u8eab\u4e5f\u975e\u5e38\u7b80\u5355\uff0c\u5728\u6761\u4ef6\u8bed\u53e5\u4e2d\u4f7f\u7528not<\/code>\u8fd0\u7b97\u7b26\u5373\u53ef\u3002\u5bf9\u4e8e\u4f7f\u7528Numpy\u5e93\u7684\u6570\u7ec4\uff0c\u53ef\u4ee5\u901a\u8fc7size<\/code>\u5c5e\u6027\u5224\u65ad\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u3002\u5728\u5b9e\u9645\u7f16\u7a0b\u4e2d\uff0c\u5408\u7406\u7684\u7a7a\u6570\u7ec4\u5224\u65ad\u548c\u64cd\u4f5c\u53ef\u4ee5\u63d0\u9ad8\u4ee3\u7801\u7684\u5065\u58ee\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002\u901a\u8fc7\u5408\u7406\u7684\u9519\u8bef\u5904\u7406\u548c\u6570\u636e\u9a8c\u8bc1\uff0c\u53ef\u4ee5\u907f\u514d\u7a0b\u5e8f\u56e0\u7a7a\u6570\u7ec4\u5f15\u53d1\u7684\u9519\u8bef\uff0c\u5e76\u63d0\u9ad8\u4ee3\u7801\u7684\u5bb9\u9519\u6027\u3002<\/p>\n<\/p>\n
      \u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
       \u5982\u4f55\u5224\u65ad\u4e00\u4e2aPython\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\uff1f<\/strong>
      \u5728Python\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528\u6761\u4ef6\u8bed\u53e5\u76f4\u63a5\u5224\u65ad\u6570\u7ec4\u7684\u957f\u5ea6\u6765\u786e\u5b9a\u5176\u662f\u5426\u4e3a\u7a7a\u3002\u53ef\u4ee5\u4f7f\u7528len()<\/code>\u51fd\u6570\uff0c\u5982\u679c\u8fd4\u56de\u503c\u4e3a0\uff0c\u5219\u8868\u793a\u6570\u7ec4\u4e3a\u7a7a\u3002\u4f8b\u5982\uff0cif len(my_array) == 0:<\/code> \u53ef\u4ee5\u7528\u6765\u68c0\u67e5\u6570\u7ec4my_array<\/code>\u662f\u5426\u4e3a\u7a7a\u3002<\/p>\n
      \u7a7a\u6570\u7ec4\u548cNone\u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/strong>
      \u7a7a\u6570\u7ec4\u662f\u4e00\u4e2a\u6709\u6548\u7684\u5bf9\u8c61\uff0c\u8868\u793a\u6ca1\u6709\u4efb\u4f55\u5143\u7d20\uff0c\u6bd4\u5982[]<\/code>\u3002\u800cNone<\/code>\u662f\u4e00\u4e2a\u7279\u6b8a\u7684\u503c\uff0c\u8868\u793a\u6ca1\u6709\u6570\u636e\u3002\u5224\u65ad\u4e00\u4e2a\u6570\u7ec4\u662f\u5426\u4e3aNone<\/code>\u53ef\u4ee5\u4f7f\u7528if my_array is None:<\/code>\uff0c\u800c\u5224\u65ad\u662f\u5426\u4e3a\u7a7a\u5219\u4f7f\u7528len()<\/code>\u51fd\u6570\u3002<\/p>\n
      \u5728\u5904\u7406\u7a7a\u6570\u7ec4\u65f6\uff0c\u6709\u54ea\u4e9b\u5e38\u89c1\u7684\u9519\u8bef\u9700\u8981\u907f\u514d\uff1f<\/strong>
      \u5904\u7406\u7a7a\u6570\u7ec4\u65f6\uff0c\u5e38\u89c1\u7684\u9519\u8bef\u5305\u62ec\u5c1d\u8bd5\u8bbf\u95ee\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u800c\u4e0d\u5148\u68c0\u67e5\u5176\u662f\u5426\u4e3a\u7a7a\uff0c\u8fd9\u4f1a\u5bfc\u81f4IndexError<\/code>\u3002\u5728\u8fdb\u884c\u8ba1\u7b97\u6216\u6570\u636e\u5904\u7406\u4e4b\u524d\uff0c\u786e\u4fdd\u901a\u8fc7if my_array:<\/code> \u6216 if len(my_array) > 0:<\/code> \u8fdb\u884c\u68c0\u67e5\uff0c\u907f\u514d\u7a0b\u5e8f\u5d29\u6e83\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Python\u4e2d\u5224\u65ad\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u7684\u51e0\u79cd\u65b9\u6cd5\u5305\u62eclen()\u51fd\u6570\u3001\u76f4\u63a5\u5224\u65ad\u3001not\u8fd0\u7b97\u7b26\u3001Numpy\u5e93\u7b49\u3002len( […]","protected":false},"author":3,"featured_media":1159629,"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\/1159621"}],"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=1159621"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1159621\/revisions"}],"predecessor-version":[{"id":1159632,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1159621\/revisions\/1159632"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1159629"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1159621"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1159621"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1159621"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}