{"id":965839,"date":"2024-12-27T04:41:49","date_gmt":"2024-12-26T20:41:49","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/965839.html"},"modified":"2024-12-27T04:41:52","modified_gmt":"2024-12-26T20:41:52","slug":"python%e4%b8%ad%e5%88%97%e8%a1%a8%e5%a6%82%e4%bd%95%e8%ae%a1%e6%95%b0","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/965839.html","title":{"rendered":"python\u4e2d\u5217\u8868\u5982\u4f55\u8ba1\u6570"},"content":{"rendered":"

\"python\u4e2d\u5217\u8868\u5982\u4f55\u8ba1\u6570\"<\/p>\n

\u5728Python\u4e2d\uff0c\u5217\u8868\u8ba1\u6570\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528count()\u65b9\u6cd5\u3001\u4f7f\u7528Counter\u7c7b\u3001\u4ee5\u53ca\u904d\u5386\u5217\u8868\u8fdb\u884c\u624b\u52a8\u8ba1\u6570\u3002<\/strong> \u5176\u4e2d\uff0c\u4f7f\u7528count()\u65b9\u6cd5\u662f\u6700\u76f4\u63a5\u548c\u7b80\u4fbf\u7684\u65b9\u5f0f\uff0c\u5b83\u53ef\u4ee5\u8fd4\u56de\u5217\u8868\u4e2d\u67d0\u4e2a\u6307\u5b9a\u5143\u7d20\u51fa\u73b0\u7684\u6b21\u6570\u3002\u901a\u8fc7Counter\u7c7b\u53ef\u4ee5\u5b9e\u73b0\u66f4\u4e3a\u590d\u6742\u7684\u7edf\u8ba1\u529f\u80fd\uff0c\u9002\u7528\u4e8e\u9700\u8981\u7edf\u8ba1\u591a\u4e2a\u5143\u7d20\u9891\u6b21\u7684\u60c5\u51b5\u3002\u624b\u52a8\u904d\u5386\u5217\u8868\u5219\u662f\u6700\u57fa\u672c\u7684\u8ba1\u6570\u65b9\u6cd5\uff0c\u9002\u5408\u7528\u4e8e\u9700\u8981\u81ea\u5b9a\u4e49\u8ba1\u6570\u903b\u8f91\u7684\u573a\u666f\u3002<\/p>\n<\/p>\n

\u4f7f\u7528count()\u65b9\u6cd5\u662f\u4e00\u79cd\u5e38\u89c1\u4e14\u7b80\u5355\u7684\u65b9\u6cd5\u3002\u5b83\u7684\u4f7f\u7528\u975e\u5e38\u76f4\u63a5\uff0c\u53ea\u9700\u8c03\u7528\u5217\u8868\u5bf9\u8c61\u7684count()\u65b9\u6cd5\uff0c\u5e76\u4f20\u5165\u9700\u8981\u8ba1\u6570\u7684\u5143\u7d20\u4f5c\u4e3a\u53c2\u6570\uff0c\u5373\u53ef\u8fd4\u56de\u8be5\u5143\u7d20\u5728\u5217\u8868\u4e2d\u51fa\u73b0\u7684\u6b21\u6570\u3002\u6bd4\u5982\uff0c\u6211\u4eec\u6709\u4e00\u4e2a\u5217\u8868my_list = [1, 2, 2, 3, 4, 4, 4]<\/code>\uff0c\u5982\u679c\u6211\u4eec\u60f3\u8981\u8ba1\u7b97\u6570\u5b574\u51fa\u73b0\u7684\u6b21\u6570\uff0c\u53ea\u9700\u4f7f\u7528my_list.count(4)<\/code>\uff0c\u7ed3\u679c\u4f1a\u8fd4\u56de3\u3002<\/p>\n<\/p>\n

\n

\u4e00\u3001\u4f7f\u7528count()\u65b9\u6cd5<\/h3>\n<\/p>\n

\u4f7f\u7528count()\u65b9\u6cd5\u662fPython\u4e2d\u8ba1\u6570\u5217\u8868\u5143\u7d20\u6700\u7b80\u5355\u7684\u65b9\u6cd5\u4e4b\u4e00\u3002\u5b83\u76f4\u63a5\u63d0\u4f9b\u4e86\u4e00\u4e2a\u5185\u7f6e\u51fd\u6570\uff0c\u80fd\u591f\u5feb\u901f\u7edf\u8ba1\u5217\u8868\u4e2d\u67d0\u4e2a\u5143\u7d20\u51fa\u73b0\u7684\u6b21\u6570\u3002<\/p>\n<\/p>\n

\u4f7f\u7528\u65b9\u6cd5<\/h4>\n<\/p>\n

count()<\/code>\u65b9\u6cd5\u7684\u57fa\u672c\u7528\u6cd5\u662f\u901a\u8fc7\u5217\u8868\u5bf9\u8c61\u8c03\u7528\uff0c\u4f20\u5165\u8981\u8ba1\u6570\u7684\u5143\u7d20\u4f5c\u4e3a\u53c2\u6570\u3002\u5177\u4f53\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n<\/p>\n

list_name.count(element)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u793a\u4f8b<\/h4>\n<\/p>\n
\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u5217\u8868\uff1a<\/p>\n<\/p>\n
colors = ['red', 'blue', 'red', 'green', 'blue', 'blue']<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5982\u679c\u6211\u4eec\u60f3\u77e5\u9053'blue'\u5728\u5217\u8868\u4e2d\u51fa\u73b0\u7684\u6b21\u6570\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n<\/p>\n
count_blue = colors.count('blue')<\/p>\n
print(count_blue)  # \u8f93\u51fa: 3<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u4e2a\u65b9\u6cd5\u5728\u6570\u636e\u91cf\u8f83\u5c0f\u65f6\u975e\u5e38\u9ad8\u6548\uff0c\u56e0\u4e3a\u5b83\u53ea\u9700\u8981\u904d\u5386\u4e00\u6b21\u5217\u8868\u5373\u53ef\u5b8c\u6210\u8ba1\u6570\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528Counter\u7c7b<\/h3>\n<\/p>\n
Counter\u7c7b\u662fcollections\u6a21\u5757\u4e2d\u7684\u4e00\u4e2a\u5b50\u7c7b\uff0c\u5b83\u63d0\u4f9b\u4e86\u66f4\u4e3a\u7075\u6d3b\u548c\u5f3a\u5927\u7684\u8ba1\u6570\u529f\u80fd\uff0c\u7279\u522b\u9002\u5408\u7528\u4e8e\u7edf\u8ba1\u591a\u4e2a\u5143\u7d20\u7684\u9891\u6b21\u3002<\/p>\n<\/p>\n
\u4f7f\u7528\u65b9\u6cd5<\/h4>\n<\/p>\n
\u9996\u5148\u9700\u8981\u5bfc\u5165collections\u6a21\u5757\uff0c\u7136\u540e\u5229\u7528Counter\u7c7b\u4f20\u5165\u5217\u8868\uff0c\u8fd4\u56de\u4e00\u4e2a\u5b57\u5178\u5f62\u5f0f\u7684\u7ed3\u679c\uff0c\u952e\u4e3a\u5143\u7d20\uff0c\u503c\u4e3a\u51fa\u73b0\u6b21\u6570\u3002<\/p>\n<\/p>\n
from collections import Counter<\/p>\n
counter = Counter(list_name)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u793a\u4f8b<\/h4>\n<\/p>\n
\u540c\u6837\u4ee5\u989c\u8272\u5217\u8868\u4e3a\u4f8b\uff1a<\/p>\n<\/p>\n
from collections import Counter<\/p>\n
colors = ['red', 'blue', 'red', 'green', 'blue', 'blue']<\/p>\n
color_count = Counter(colors)<\/p>\n
print(color_count)  # \u8f93\u51fa: Counter({'blue': 3, 'red': 2, 'green': 1})<\/p>\n
<\/code><\/pre>\n<\/p>\n
Counter\u4e0d\u4ec5\u8fd4\u56de\u5355\u4e2a\u5143\u7d20\u7684\u8ba1\u6570\uff0c\u8fd8\u53ef\u4ee5\u76f4\u63a5\u63d0\u4f9b\u6574\u4e2a\u5217\u8868\u7684\u6240\u6709\u5143\u7d20\u7684\u8ba1\u6570\u7ed3\u679c\u3002\u5bf9\u4e8e\u9700\u8981\u8fdb\u884c\u590d\u6742\u6570\u636e\u5206\u6790\u7684\u60c5\u51b5\uff0c\u8fd9\u79cd\u65b9\u6cd5\u975e\u5e38\u6709\u7528\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u624b\u52a8\u904d\u5386\u5217\u8868\u8ba1\u6570<\/h3>\n<\/p>\n
\u624b\u52a8\u904d\u5386\u5217\u8868\u8ba1\u6570\u662f\u4e00\u79cd\u57fa\u672c\u7684\u65b9\u6cd5\uff0c\u867d\u7136\u4e0d\u5982\u4e0a\u8ff0\u65b9\u6cd5\u7b80\u6d01\uff0c\u4f46\u5b83\u7075\u6d3b\u6027\u9ad8\uff0c\u53ef\u4ee5\u5bf9\u8ba1\u6570\u8fc7\u7a0b\u8fdb\u884c\u8be6\u7ec6\u63a7\u5236\u3002<\/p>\n<\/p>\n
\u4f7f\u7528\u65b9\u6cd5<\/h4>\n<\/p>\n
\u901a\u8fc7\u521b\u5efa\u4e00\u4e2a\u8ba1\u6570\u5668\u53d8\u91cf\uff0c\u7136\u540e\u904d\u5386\u5217\u8868\uff0c\u9047\u5230\u6307\u5b9a\u5143\u7d20\u65f6\uff0c\u5c06\u8ba1\u6570\u5668\u52a01\u3002<\/p>\n<\/p>\n
count = 0<\/p>\n
for item in list_name:<\/p>\n
    if item == element:<\/p>\n
        count += 1<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u793a\u4f8b<\/h4>\n<\/p>\n
\u4ecd\u7136\u4ee5\u989c\u8272\u5217\u8868\u4e3a\u4f8b\uff0c\u624b\u52a8\u8ba1\u6570'green'\u7684\u51fa\u73b0\u6b21\u6570\uff1a<\/p>\n<\/p>\n
colors = ['red', 'blue', 'red', 'green', 'blue', 'blue']<\/p>\n
count_green = 0<\/p>\n
for color in colors:<\/p>\n
    if color == 'green':<\/p>\n
        count_green += 1<\/p>\n
print(count_green)  # \u8f93\u51fa: 1<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u867d\u7136\u4ee3\u7801\u8f83\u591a\uff0c\u4f46\u5728\u9700\u8981\u5bf9\u8ba1\u6570\u903b\u8f91\u8fdb\u884c\u590d\u6742\u63a7\u5236\u65f6\uff08\u4f8b\u5982\u6761\u4ef6\u8ba1\u6570\uff09\u975e\u5e38\u5b9e\u7528\u3002<\/p>\n<\/p>\n
\u56db\u3001\u7ed3\u5408\u5176\u4ed6\u65b9\u6cd5\u8fdb\u884c\u9ad8\u7ea7\u8ba1\u6570<\/h3>\n<\/p>\n
\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u6211\u4eec\u53ef\u80fd\u9700\u8981\u7ed3\u5408\u5176\u4ed6\u6570\u636e\u5904\u7406\u6280\u672f\u8fdb\u884c\u66f4\u590d\u6742\u7684\u8ba1\u6570\u4efb\u52a1\u3002\u4f8b\u5982\uff0c\u7ed3\u5408\u5217\u8868\u63a8\u5bfc\u5f0f\u3001lambda\u51fd\u6570\u7b49\u3002<\/p>\n<\/p>\n
\u5217\u8868\u63a8\u5bfc\u5f0f\u7ed3\u5408count<\/h4>\n<\/p>\n
\u4f7f\u7528\u5217\u8868\u63a8\u5bfc\u5f0f\u53ef\u4ee5\u5728\u4e00\u4e2a\u8bed\u53e5\u4e2d\u5b8c\u6210\u8ba1\u6570\u4efb\u52a1\uff0c\u9002\u7528\u4e8e\u7b80\u5355\u7684\u6761\u4ef6\u8ba1\u6570\u3002<\/p>\n<\/p>\n
colors = ['red', 'blue', 'red', 'green', 'blue', 'blue']<\/p>\n
count_red = sum([1 for color in colors if color == 'red'])<\/p>\n
print(count_red)  # \u8f93\u51fa: 2<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4f7f\u7528lambda\u51fd\u6570<\/h4>\n<\/p>\n
\u901a\u8fc7lambda\u51fd\u6570\u7ed3\u5408filter\u51fd\u6570\uff0c\u53ef\u4ee5\u5b9e\u73b0\u5bf9\u67d0\u4e2a\u6761\u4ef6\u7684\u8ba1\u6570\u3002<\/p>\n<\/p>\n
colors = ['red', 'blue', 'red', 'green', 'blue', 'blue']<\/p>\n
count_blue = len(list(filter(lambda x: x == 'blue', colors)))<\/p>\n
print(count_blue)  # \u8f93\u51fa: 3<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u5c06\u8ba1\u6570\u903b\u8f91\u5c01\u88c5\u5728filter\u4e2d\uff0c\u66f4\u52a0\u7075\u6d3b\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u5e94\u7528\u573a\u666f\u53ca\u6700\u4f73\u5b9e\u8df5<\/h3>\n<\/p>\n
\u5728\u4e0d\u540c\u7684\u573a\u666f\u4e0b\uff0c\u9009\u62e9\u5408\u9002\u7684\u8ba1\u6570\u65b9\u6cd5\u53ef\u4ee5\u63d0\u9ad8\u7a0b\u5e8f\u7684\u6548\u7387\u548c\u53ef\u8bfb\u6027\u3002<\/p>\n<\/p>\n
\u5c0f\u89c4\u6a21\u6570\u636e<\/h4>\n<\/p>\n
\u5bf9\u4e8e\u5c0f\u89c4\u6a21\u7684\u6570\u636e\u96c6\uff0c\u4f7f\u7528count()\u65b9\u6cd5\u662f\u6700\u76f4\u63a5\u548c\u9ad8\u6548\u7684\u9009\u62e9\u3002\u5176\u4ee3\u7801\u7b80\u6d01\u4e14\u6613\u4e8e\u7406\u89e3\u3002<\/p>\n<\/p>\n
\u5927\u89c4\u6a21\u6570\u636e\u53ca\u590d\u6742\u8ba1\u6570<\/h4>\n<\/p>\n
\u5728\u5904\u7406\u5927\u89c4\u6a21\u6570\u636e\u65f6\uff0cCounter\u7c7b\u66f4\u4e3a\u9ad8\u6548\u3002\u5b83\u4e0d\u4ec5\u53ef\u4ee5\u4e00\u6b21\u6027\u5f97\u5230\u6240\u6709\u5143\u7d20\u7684\u8ba1\u6570\u7ed3\u679c\uff0c\u8fd8\u80fd\u8f7b\u677e\u5b9e\u73b0\u591a\u4e2a\u5143\u7d20\u7684\u7edf\u8ba1\u3002<\/p>\n<\/p>\n
\u81ea\u5b9a\u4e49\u8ba1\u6570\u903b\u8f91<\/h4>\n<\/p>\n
\u5f53\u9700\u8981\u5b9e\u73b0\u590d\u6742\u7684\u81ea\u5b9a\u4e49\u8ba1\u6570\u903b\u8f91\u65f6\uff0c\u624b\u52a8\u904d\u5386\u6216\u7ed3\u5408\u5176\u4ed6\u51fd\u6570\uff08\u5982\u5217\u8868\u63a8\u5bfc\u5f0f\u3001lambda\uff09\u662f\u66f4\u4e3a\u7075\u6d3b\u7684\u9009\u62e9\u3002<\/p>\n<\/p>\n
\u603b\u7ed3\u6765\u8bf4\uff0cPython\u63d0\u4f9b\u4e86\u591a\u79cd\u65b9\u6cd5\u6765\u6ee1\u8db3\u4e0d\u540c\u573a\u666f\u4e0b\u7684\u5217\u8868\u8ba1\u6570\u9700\u6c42\u3002\u6839\u636e\u5177\u4f53\u7684\u5e94\u7528\u573a\u666f\uff0c\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u53ef\u4ee5\u6709\u6548\u63d0\u9ad8\u4ee3\u7801\u7684\u6548\u7387\u548c\u53ef\u8bfb\u6027\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
 \u5982\u4f55\u5728Python\u4e2d\u7edf\u8ba1\u5217\u8868\u4e2d\u67d0\u4e2a\u5143\u7d20\u7684\u51fa\u73b0\u6b21\u6570\uff1f<\/strong>
\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528count()<\/code>\u65b9\u6cd5\u6765\u7edf\u8ba1\u5217\u8868\u4e2d\u67d0\u4e2a\u7279\u5b9a\u5143\u7d20\u7684\u51fa\u73b0\u6b21\u6570\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4f60\u6709\u4e00\u4e2a\u5217\u8868my_list = [1, 2, 3, 2, 4]<\/code>\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528my_list.count(2)<\/code>\u6765\u83b7\u53d6\u6570\u5b572\u5728\u5217\u8868\u4e2d\u51fa\u73b0\u7684\u6b21\u6570\uff0c\u7ed3\u679c\u5c06\u8fd4\u56de2\u3002<\/p>\n
Python\u4e2d\u7684\u5217\u8868\u8ba1\u6570\u529f\u80fd\u6709\u54ea\u4e9b\u5e38\u7528\u65b9\u6cd5\uff1f<\/strong>
\u9664\u4e86\u4f7f\u7528count()<\/code>\u65b9\u6cd5\uff0cPython\u8fd8\u63d0\u4f9b\u4e86\u5176\u4ed6\u4e00\u4e9b\u65b9\u6cd5\u6765\u8fdb\u884c\u8ba1\u6570\u3002\u4f8b\u5982\uff0c\u4f7f\u7528collections<\/code>\u6a21\u5757\u4e2d\u7684Counter<\/code>\u7c7b\uff0c\u53ef\u4ee5\u66f4\u65b9\u4fbf\u5730\u7edf\u8ba1\u5217\u8868\u4e2d\u6240\u6709\u5143\u7d20\u7684\u51fa\u73b0\u6b21\u6570\u3002\u901a\u8fc7from collections import Counter<\/code>\u5f15\u5165Counter\u540e\uff0c\u8c03\u7528Counter(my_list)<\/code>\u4f1a\u8fd4\u56de\u4e00\u4e2a\u5b57\u5178\uff0c\u5b57\u5178\u7684\u952e\u662f\u5217\u8868\u4e2d\u7684\u5143\u7d20\uff0c\u503c\u662f\u5b83\u4eec\u7684\u51fa\u73b0\u6b21\u6570\u3002<\/p>\n
\u5982\u4f55\u4f7f\u7528\u5b57\u5178\u6765\u5bf9Python\u5217\u8868\u4e2d\u7684\u5143\u7d20\u8fdb\u884c\u8ba1\u6570\uff1f<\/strong>
\u53ef\u4ee5\u901a\u8fc7\u904d\u5386\u5217\u8868\u5e76\u5c06\u5143\u7d20\u4f5c\u4e3a\u5b57\u5178\u7684\u952e\u6765\u5b9e\u73b0\u8ba1\u6570\u3002\u521d\u59cb\u5316\u4e00\u4e2a\u7a7a\u5b57\u5178\uff0c\u7136\u540e\u5bf9\u4e8e\u5217\u8868\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\uff0c\u68c0\u67e5\u5176\u662f\u5426\u5728\u5b57\u5178\u4e2d\u3002\u5982\u679c\u5728\uff0c\u589e\u52a0\u8ba1\u6570\uff1b\u5982\u679c\u4e0d\u5728\uff0c\u521d\u59cb\u5316\u8ba1\u6570\u4e3a1\u3002\u8fd9\u79cd\u65b9\u6cd5\u5728\u5904\u7406\u8f83\u5927\u5217\u8868\u65f6\u975e\u5e38\u6709\u6548\uff0c\u80fd\u591f\u81ea\u5b9a\u4e49\u8ba1\u6570\u7684\u903b\u8f91\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Python\u4e2d\uff0c\u5217\u8868\u8ba1\u6570\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528count()\u65b9\u6cd5\u3001\u4f7f\u7528Counter\u7c7b\u3001\u4ee5\u53ca\u904d\u5386\u5217\u8868\u8fdb\u884c\u624b\u52a8\u8ba1\u6570\u3002 \u5176 […]","protected":false},"author":3,"featured_media":965851,"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\/965839"}],"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=965839"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/965839\/revisions"}],"predecessor-version":[{"id":965852,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/965839\/revisions\/965852"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/965851"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=965839"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=965839"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=965839"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}