{"id":1130040,"date":"2025-01-08T20:35:19","date_gmt":"2025-01-08T12:35:19","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1130040.html"},"modified":"2025-01-08T20:35:23","modified_gmt":"2025-01-08T12:35:23","slug":"python%e5%a6%82%e4%bd%95%e6%9f%a5%e7%9c%8b%e4%ba%8c%e8%bf%9b%e5%88%b6%e6%9c%80%e5%a4%a7%e4%bd%8d%e6%95%b0","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1130040.html","title":{"rendered":"python\u5982\u4f55\u67e5\u770b\u4e8c\u8fdb\u5236\u6700\u5927\u4f4d\u6570"},"content":{"rendered":"

\"python\u5982\u4f55\u67e5\u770b\u4e8c\u8fdb\u5236\u6700\u5927\u4f4d\u6570\"<\/p>\n

\u901a\u8fc7Python\u67e5\u770b\u4e8c\u8fdb\u5236\u6700\u5927\u4f4d\u6570\u7684\u6838\u5fc3\u65b9\u6cd5\u5305\u62ec\uff1a\u4f7f\u7528bit_length()<\/code>\u65b9\u6cd5\u3001\u624b\u52a8\u8ba1\u7b97\u4e8c\u8fdb\u5236\u4f4d\u6570\u3001\u4f7f\u7528bin()<\/code>\u51fd\u6570\u3002<\/strong> \u5176\u4e2d\uff0c\u6700\u5e38\u7528\u548c\u6700\u7b80\u6d01\u7684\u65b9\u6cd5\u662f\u4f7f\u7528Python\u5185\u7f6e\u7684bit_length()<\/code>\u65b9\u6cd5\u3002<\/p>\n<\/p>\n

Python\u7684bit_length()<\/code>\u65b9\u6cd5\u662f\u4e00\u4e2a\u975e\u5e38\u65b9\u4fbf\u7684\u5de5\u5177\uff0c\u7528\u4e8e\u8ba1\u7b97\u4e00\u4e2a\u6574\u6570\u7684\u4e8c\u8fdb\u5236\u8868\u793a\u4e2d\u6700\u5de6\u8fb9\u76841\u6240\u5360\u636e\u7684\u4f4d\u6570\u3002\u6bd4\u5982\uff0c\u5bf9\u4e8e\u6574\u657018\uff0c\u5176\u4e8c\u8fdb\u5236\u8868\u793a\u4e3a10010<\/code>\uff0c\u8c03\u752818.bit_length()<\/code>\u5c06\u8fd4\u56de5\u3002\u8fd9\u610f\u5473\u7740\uff0c18\u7684\u4e8c\u8fdb\u5236\u8868\u793a\u9700\u89815\u4f4d\u3002\u6b64\u5916\uff0c\u624b\u52a8\u8ba1\u7b97\u4e8c\u8fdb\u5236\u4f4d\u6570\u548c\u4f7f\u7528bin()<\/code>\u51fd\u6570\u4e5f\u662f\u6709\u6548\u7684\u65b9\u6cd5\uff0c\u4f46\u76f8\u5bf9\u6765\u8bf4\uff0cbit_length()<\/code>\u66f4\u52a0\u7b80\u6d01\u548c\u76f4\u89c2\u3002<\/p>\n<\/p>\n

\u63a5\u4e0b\u6765\uff0c\u6211\u5c06\u8be6\u7ec6\u9610\u8ff0\u8fd9\u4e9b\u65b9\u6cd5\uff0c\u5e76\u63d0\u4f9b\u4ee3\u7801\u793a\u4f8b\u548c\u5b9e\u9645\u5e94\u7528\u573a\u666f\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528 bit_length()<\/code> \u65b9\u6cd5<\/h3>\n<\/p>\n

1\u3001\u7b80\u4ecb<\/h4>\n<\/p>\n

bit_length()<\/code> \u65b9\u6cd5\u662fPython\u6574\u6570\u5bf9\u8c61\u7684\u4e00\u90e8\u5206\uff0c\u7528\u4e8e\u8fd4\u56de\u6574\u6570\u7684\u4e8c\u8fdb\u5236\u8868\u793a\u4e2d\u6240\u9700\u7684\u4f4d\u6570\u3002\u8fd9\u662f\u6700\u76f4\u63a5\u548c\u5e38\u7528\u7684\u65b9\u6cd5\u3002<\/p>\n<\/p>\n

2\u3001\u793a\u4f8b\u4ee3\u7801<\/h4>\n<\/p>\n

num = 18<\/p>\n
print(num.bit_length())  # \u8f93\u51fa: 5<\/p>\n
<\/code><\/pre>\n<\/p>\n
3\u3001\u8be6\u7ec6\u63cf\u8ff0<\/h4>\n<\/p>\n
bit_length()<\/code>\u65b9\u6cd5\u53ef\u4ee5\u6709\u6548\u5730\u8ba1\u7b97\u4e00\u4e2a\u6574\u6570\u5728\u4e8c\u8fdb\u5236\u8868\u793a\u4e2d\u6240\u9700\u7684\u4f4d\u6570\u3002\u4f8b\u5982\uff0c\u5bf9\u4e8e\u6574\u657018\uff0c\u5176\u4e8c\u8fdb\u5236\u8868\u793a\u4e3a10010<\/code>\uff0c\u9700\u89815\u4f4d\u3002\u56e0\u6b64\uff0c18.bit_length()<\/code>\u5c06\u8fd4\u56de5\u3002\u8fd9\u4e2a\u65b9\u6cd5\u7684\u4f18\u70b9\u662f\u975e\u5e38\u7b80\u6d01\uff0c\u4e14\u76f4\u63a5\u8c03\u7528\u6574\u6570\u5bf9\u8c61\u7684\u65b9\u6cd5\uff0c\u65e0\u9700\u989d\u5916\u7684\u8ba1\u7b97\u6216\u8f6c\u6362\u3002<\/p>\n<\/p>\n
4\u3001\u5b9e\u9645\u5e94\u7528<\/h4>\n<\/p>\n
\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0cbit_length()<\/code>\u65b9\u6cd5\u5e38\u7528\u4e8e\u9700\u8981\u5904\u7406\u4e8c\u8fdb\u5236\u6570\u636e\u7684\u573a\u666f\uff0c\u5982\u52a0\u5bc6\u7b97\u6cd5\u3001\u538b\u7f29\u7b97\u6cd5\u548c\u786c\u4ef6\u63a5\u53e3\u7b49\u3002\u4f8b\u5982\uff0c\u5728\u6570\u636e\u538b\u7f29\u4e2d\uff0c\u4e86\u89e3\u6570\u636e\u6240\u9700\u7684\u6700\u5c0f\u4f4d\u6570\u53ef\u4ee5\u5e2e\u52a9\u4f18\u5316\u5b58\u50a8\u6548\u7387\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u624b\u52a8\u8ba1\u7b97\u4e8c\u8fdb\u5236\u4f4d\u6570<\/h3>\n<\/p>\n
1\u3001\u7b80\u4ecb<\/h4>\n<\/p>\n
\u624b\u52a8\u8ba1\u7b97\u4e8c\u8fdb\u5236\u4f4d\u6570\u7684\u65b9\u6cd5\u4e3b\u8981\u6d89\u53ca\u6570\u5b66\u8fd0\u7b97\uff0c\u5982\u4f7f\u7528\u5bf9\u6570\u51fd\u6570\u3002<\/p>\n<\/p>\n
2\u3001\u793a\u4f8b\u4ee3\u7801<\/h4>\n<\/p>\n
import math<\/p>\n
num = 18<\/p>\n
bit_length = math.floor(math.log2(num)) + 1<\/p>\n
print(bit_length)  # \u8f93\u51fa: 5<\/p>\n
<\/code><\/pre>\n<\/p>\n
3\u3001\u8be6\u7ec6\u63cf\u8ff0<\/h4>\n<\/p>\n
\u624b\u52a8\u8ba1\u7b97\u4e8c\u8fdb\u5236\u4f4d\u6570\u7684\u65b9\u6cd5\u9700\u8981\u4f7f\u7528\u6570\u5b66\u5e93\u4e2d\u7684\u5bf9\u6570\u51fd\u6570\u3002\u5177\u4f53\u6765\u8bf4\uff0c\u53ef\u4ee5\u4f7f\u7528math.log2(num)<\/code>\u8ba1\u7b97\u4e00\u4e2a\u6570\u7684\u4e8c\u8fdb\u5236\u5bf9\u6570\uff0c\u7136\u540e\u4f7f\u7528math.floor()<\/code>\u51fd\u6570\u53d6\u6574\uff0c\u518d\u52a01\u5f97\u5230\u4f4d\u6570\u3002\u4f8b\u5982\uff0c\u5bf9\u4e8e\u6574\u657018\uff0c\u5176\u4e8c\u8fdb\u5236\u5bf9\u6570\u7ea6\u4e3a4.17\uff0c\u53d6\u6574\u540e\u52a01\u5f97\u52305\u3002\u8fd9\u79cd\u65b9\u6cd5\u76f8\u5bf9bit_length()<\/code>\u7a0d\u663e\u590d\u6742\uff0c\u4f46\u5728\u67d0\u4e9b\u7279\u5b9a\u573a\u666f\u4e0b\u53ef\u80fd\u9700\u8981\u4f7f\u7528\u3002<\/p>\n<\/p>\n
4\u3001\u5b9e\u9645\u5e94\u7528<\/h4>\n<\/p>\n
\u624b\u52a8\u8ba1\u7b97\u4e8c\u8fdb\u5236\u4f4d\u6570\u7684\u65b9\u6cd5\u5728\u67d0\u4e9b\u9ad8\u7cbe\u5ea6\u8ba1\u7b97\u6216\u9700\u8981\u81ea\u5b9a\u4e49\u7b97\u6cd5\u7684\u573a\u666f\u4e0b\u53ef\u80fd\u66f4\u4e3a\u5408\u9002\u3002\u4f8b\u5982\uff0c\u5728\u4e00\u4e9b\u81ea\u5b9a\u4e49\u7684\u52a0\u5bc6\u7b97\u6cd5\u4e2d\uff0c\u53ef\u80fd\u9700\u8981\u7cbe\u786e\u63a7\u5236\u4e8c\u8fdb\u5236\u4f4d\u6570\u7684\u8ba1\u7b97\u65b9\u5f0f\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528 bin()<\/code> \u51fd\u6570<\/h3>\n<\/p>\n
1\u3001\u7b80\u4ecb<\/h4>\n<\/p>\n
bin()<\/code> \u51fd\u6570\u662fPython\u5185\u7f6e\u51fd\u6570\uff0c\u7528\u4e8e\u5c06\u6574\u6570\u8f6c\u6362\u4e3a\u4e8c\u8fdb\u5236\u5b57\u7b26\u4e32\u3002<\/p>\n<\/p>\n
2\u3001\u793a\u4f8b\u4ee3\u7801<\/h4>\n<\/p>\n
num = 18<\/p>\n
bin_representation = bin(num)<\/p>\n
bit_length = len(bin_representation) - 2  # \u51cf\u53bb'0b'\u524d\u7f00<\/p>\n
print(bit_length)  # \u8f93\u51fa: 5<\/p>\n
<\/code><\/pre>\n<\/p>\n
3\u3001\u8be6\u7ec6\u63cf\u8ff0<\/h4>\n<\/p>\n
bin()<\/code>\u51fd\u6570\u53ef\u4ee5\u5c06\u4e00\u4e2a\u6574\u6570\u8f6c\u6362\u4e3a\u4e8c\u8fdb\u5236\u5b57\u7b26\u4e32\u3002\u4f8b\u5982\uff0c\u5bf9\u4e8e\u6574\u657018\uff0cbin(18)<\/code>\u5c06\u8fd4\u56de'0b10010'<\/code>\u3002\u7136\u540e\uff0c\u901a\u8fc7\u8ba1\u7b97\u5b57\u7b26\u4e32\u957f\u5ea6\u5e76\u51cf\u53bb\u524d\u7f00'0b'<\/code>\u7684\u957f\u5ea6\uff0c\u53ef\u4ee5\u5f97\u5230\u4e8c\u8fdb\u5236\u4f4d\u6570\u3002\u8fd9\u79cd\u65b9\u6cd5\u7684\u4f18\u70b9\u662f\u76f4\u89c2\uff0c\u4f46\u76f8\u5bf9\u6765\u8bf4\u4e0d\u5982bit_length()<\/code>\u7b80\u6d01\u3002<\/p>\n<\/p>\n
4\u3001\u5b9e\u9645\u5e94\u7528<\/h4>\n<\/p>\n
\u5728\u5904\u7406\u9700\u8981\u5c06\u6574\u6570\u8f6c\u6362\u4e3a\u4e8c\u8fdb\u5236\u5b57\u7b26\u4e32\u7684\u573a\u666f\u4e2d\uff0cbin()<\/code>\u51fd\u6570\u975e\u5e38\u6709\u7528\u3002\u4f8b\u5982\uff0c\u5728\u4e00\u4e9b\u8c03\u8bd5\u548c\u65e5\u5fd7\u8bb0\u5f55\u4e2d\uff0c\u53ef\u80fd\u9700\u8981\u5c06\u6574\u6570\u4ee5\u4e8c\u8fdb\u5236\u5f62\u5f0f\u8f93\u51fa\uff0c\u4ee5\u4fbf\u66f4\u6e05\u6670\u5730\u7406\u89e3\u6570\u636e\u7684\u4e8c\u8fdb\u5236\u7ed3\u6784\u3002<\/p>\n<\/p>\n
\u56db\u3001\u603b\u7ed3<\/h3>\n<\/p>\n
\u901a\u8fc7\u4e0a\u8ff0\u4e09\u79cd\u65b9\u6cd5\uff0c\u6211\u4eec\u53ef\u4ee5\u6e05\u695a\u5730\u770b\u5230\uff0c\u4f7f\u7528bit_length()<\/code>\u65b9\u6cd5\u662f\u6700\u7b80\u6d01\u548c\u9ad8\u6548\u7684\u65b9\u5f0f<\/strong>\uff0c\u7279\u522b\u662f\u5728\u9700\u8981\u9891\u7e41\u8ba1\u7b97\u4e8c\u8fdb\u5236\u4f4d\u6570\u7684\u573a\u666f\u4e2d\u3002\u624b\u52a8\u8ba1\u7b97\u548c\u4f7f\u7528bin()<\/code>\u51fd\u6570\u867d\u7136\u4e5f\u80fd\u8fbe\u5230\u76ee\u7684\uff0c\u4f46\u5728\u4ee3\u7801\u7b80\u6d01\u6027\u548c\u53ef\u8bfb\u6027\u4e0a\u7565\u900a\u4e00\u7b79\u3002<\/p>\n<\/p>\n
\u5728\u5b9e\u9645\u9879\u76ee\u4e2d\uff0c\u6839\u636e\u5177\u4f53\u9700\u6c42\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u975e\u5e38\u91cd\u8981\u3002\u5982\u679c\u4ee3\u7801\u9700\u8981\u9ad8\u6548\u4e14\u7b80\u6d01\uff0c\u90a3\u4e48bit_length()<\/code>\u65e0\u7591\u662f\u6700\u4f73\u9009\u62e9\uff1b\u5982\u679c\u9700\u8981\u81ea\u5b9a\u4e49\u7b97\u6cd5\u6216\u8fdb\u884c\u9ad8\u7cbe\u5ea6\u8ba1\u7b97\uff0c\u624b\u52a8\u8ba1\u7b97\u53ef\u80fd\u66f4\u4e3a\u5408\u9002\uff1b\u800c\u5728\u9700\u8981\u8fdb\u884c\u8c03\u8bd5\u6216\u65e5\u5fd7\u8bb0\u5f55\u65f6\uff0cbin()<\/code>\u51fd\u6570\u5219\u63d0\u4f9b\u4e86\u76f4\u89c2\u7684\u4e8c\u8fdb\u5236\u8868\u793a\u3002<\/p>\n<\/p>\n
\u65e0\u8bba\u9009\u62e9\u54ea\u79cd\u65b9\u6cd5\uff0c\u90fd\u9700\u8981\u6839\u636e\u5177\u4f53\u7684\u5e94\u7528\u573a\u666f\u8fdb\u884c\u6743\u8861\uff0c\u4ee5\u786e\u4fdd\u4ee3\u7801\u7684\u6548\u7387\u548c\u53ef\u7ef4\u62a4\u6027\u3002\u901a\u8fc7\u6df1\u5165\u7406\u89e3\u8fd9\u4e9b\u65b9\u6cd5\u7684\u539f\u7406\u548c\u5e94\u7528\uff0c\u6211\u4eec\u53ef\u4ee5\u66f4\u7075\u6d3b\u5730\u5904\u7406\u5404\u79cd\u4e0e\u4e8c\u8fdb\u5236\u4f4d\u6570\u76f8\u5173\u7684\u95ee\u9898\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
 \u5982\u4f55\u5728Python\u4e2d\u83b7\u53d6\u4e00\u4e2a\u6574\u6570\u7684\u4e8c\u8fdb\u5236\u4f4d\u6570\uff1f<\/strong>
\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u5185\u7f6e\u7684bin()<\/code>\u51fd\u6570\u6765\u5c06\u6574\u6570\u8f6c\u6362\u4e3a\u4e8c\u8fdb\u5236\u5b57\u7b26\u4e32\uff0c\u7136\u540e\u901a\u8fc7\u8ba1\u7b97\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\u6765\u83b7\u53d6\u5176\u4e8c\u8fdb\u5236\u4f4d\u6570\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a  <\/p>\n
num = 42\nbinary_length = len(bin(num)) - 2  # \u51cf\u53bb '0b' \u524d\u7f00\nprint(f"{num} \u7684\u4e8c\u8fdb\u5236\u4f4d\u6570\u662f: {binary_length}")\n<\/code><\/pre>\n
Python\u4e2d\u662f\u5426\u6709\u5185\u7f6e\u51fd\u6570\u6765\u83b7\u53d6\u6574\u6570\u7684\u6700\u5927\u4e8c\u8fdb\u5236\u4f4d\u6570\uff1f<\/strong>
Python\u5e76\u6ca1\u6709\u76f4\u63a5\u63d0\u4f9b\u83b7\u53d6\u6574\u6570\u6700\u5927\u4e8c\u8fdb\u5236\u4f4d\u6570\u7684\u5185\u7f6e\u51fd\u6570\uff0c\u4f46\u53ef\u4ee5\u901a\u8fc7\u8ba1\u7b97\u6700\u5927\u503c\u548c\u4f7f\u7528bit_length()<\/code>\u65b9\u6cd5\u6765\u5b9e\u73b0\u3002bit_length()<\/code>\u8fd4\u56de\u4e00\u4e2a\u6574\u6570\u7684\u4e8c\u8fdb\u5236\u8868\u793a\u4e2d\u6240\u9700\u7684\u4f4d\u6570\uff0c\u4e0d\u5305\u62ec\u7b26\u53f7\u4f4d\u3002\u4f8b\u5982\uff1a  <\/p>\n
max_num = 255\nmax_bit_length = max_num.bit_length()\nprint(f"\u6700\u5927\u503c {max_num} \u7684\u4e8c\u8fdb\u5236\u4f4d\u6570\u662f: {max_bit_length}")\n<\/code><\/pre>\n
\u5982\u4f55\u5904\u7406\u8d1f\u6570\u5728\u4e8c\u8fdb\u5236\u8868\u793a\u4e2d\u7684\u4f4d\u6570\u95ee\u9898\uff1f<\/strong>
\u5728Python\u4e2d\uff0c\u8d1f\u6570\u7684\u4e8c\u8fdb\u5236\u8868\u793a\u901a\u5e38\u91c7\u7528\u8865\u7801\u5f62\u5f0f\u3002\u53ef\u4ee5\u4f7f\u7528bit_length()<\/code>\u65b9\u6cd5\u83b7\u53d6\u5176\u7edd\u5bf9\u503c\u7684\u4f4d\u6570\u3002\u82e5\u9700\u8981\u83b7\u53d6\u8d1f\u6570\u7684\u6709\u6548\u4f4d\u6570\uff0c\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u8ba1\u7b97\uff1a  <\/p>\n
num = -42\nabs_bit_length = abs(num).bit_length()\nprint(f"{num} \u7684\u7edd\u5bf9\u503c\u7684\u4e8c\u8fdb\u5236\u4f4d\u6570\u662f: {abs_bit_length}")\n<\/code><\/pre>\n
\u8bf7\u6ce8\u610f\uff0c\u8d1f\u6570\u7684\u4e8c\u8fdb\u5236\u4f4d\u6570\u901a\u5e38\u4e0e\u5176\u6b63\u6570\u90e8\u5206\u76f8\u540c\uff0c\u4f46\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\u53ef\u80fd\u9700\u8981\u8003\u8651\u7b26\u53f7\u4f4d\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u901a\u8fc7Python\u67e5\u770b\u4e8c\u8fdb\u5236\u6700\u5927\u4f4d\u6570\u7684\u6838\u5fc3\u65b9\u6cd5\u5305\u62ec\uff1a\u4f7f\u7528bit_length()\u65b9\u6cd5\u3001\u624b\u52a8\u8ba1\u7b97\u4e8c\u8fdb\u5236\u4f4d\u6570\u3001\u4f7f\u7528b […]","protected":false},"author":3,"featured_media":1130047,"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\/1130040"}],"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=1130040"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1130040\/revisions"}],"predecessor-version":[{"id":1130051,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1130040\/revisions\/1130051"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1130047"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1130040"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1130040"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1130040"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}