{"id":1001117,"date":"2024-12-27T09:57:14","date_gmt":"2024-12-27T01:57:14","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1001117.html"},"modified":"2024-12-27T09:57:19","modified_gmt":"2024-12-27T01:57:19","slug":"%e5%a6%82%e4%bd%95%e7%94%a8python%e7%bb%9f%e8%ae%a1count","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1001117.html","title":{"rendered":"\u5982\u4f55\u7528Python\u7edf\u8ba1count"},"content":{"rendered":"

\"\u5982\u4f55\u7528Python\u7edf\u8ba1count\"<\/p>\n

\u4f7f\u7528Python\u7edf\u8ba1count\u7684\u65b9\u6cd5\u6709\u591a\u79cd\uff0c\u5305\u62ec\u4f7f\u7528\u5185\u7f6e\u51fd\u6570\u3001collections\u6a21\u5757\u3001pandas\u5e93\u7b49\u3002\u5bf9\u4e8e\u4e0d\u540c\u7684\u6570\u636e\u7ed3\u6784\u548c\u5e94\u7528\u573a\u666f\uff0c\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u53ef\u4ee5\u63d0\u9ad8\u4ee3\u7801\u7684\u6548\u7387\u548c\u53ef\u8bfb\u6027\u3002<\/strong>\u5176\u4e2d\uff0c\u6700\u5e38\u7528\u7684\u65b9\u6cd5\u662f\u4f7f\u7528Python\u5185\u7f6e\u7684count<\/code>\u65b9\u6cd5\u6765\u7edf\u8ba1\u5b57\u7b26\u4e32\u4e2d\u67d0\u4e2a\u5b57\u7b26\u6216\u5b50\u5b57\u7b26\u4e32\u7684\u51fa\u73b0\u6b21\u6570\uff0c\u4f7f\u7528collections.Counter<\/code>\u7c7b\u53ef\u4ee5\u65b9\u4fbf\u5730\u7edf\u8ba1\u5217\u8868\u6216\u5176\u4ed6\u53ef\u8fed\u4ee3\u5bf9\u8c61\u4e2d\u5143\u7d20\u7684\u51fa\u73b0\u6b21\u6570\uff0c\u800c\u5bf9\u4e8e\u5904\u7406\u5927\u89c4\u6a21\u6570\u636e\u7684\u9700\u6c42\uff0cpandas<\/code>\u5e93\u7684value_counts<\/code>\u65b9\u6cd5\u5219\u63d0\u4f9b\u4e86\u5f3a\u5927\u7684\u529f\u80fd\u3002\u63a5\u4e0b\u6765\uff0c\u6211\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u5982\u4f55\u5728\u4e0d\u540c\u60c5\u51b5\u4e0b\u4f7f\u7528\u8fd9\u4e9b\u65b9\u6cd5\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528\u5185\u7f6ecount\u65b9\u6cd5<\/h3>\n<\/p>\n

Python\u5b57\u7b26\u4e32\u548c\u5217\u8868\u5bf9\u8c61\u90fd\u63d0\u4f9b\u4e86count<\/code>\u65b9\u6cd5\uff0c\u7528\u4e8e\u7edf\u8ba1\u67d0\u4e2a\u5143\u7d20\u51fa\u73b0\u7684\u6b21\u6570\u3002<\/p>\n<\/p>\n

1. \u5b57\u7b26\u4e32\u4e2d\u7684count\u65b9\u6cd5<\/h4>\n<\/p>\n

\u5bf9\u4e8e\u5b57\u7b26\u4e32\u5bf9\u8c61\uff0ccount<\/code>\u65b9\u6cd5\u7528\u4e8e\u7edf\u8ba1\u4e00\u4e2a\u5b50\u5b57\u7b26\u4e32\u5728\u5b57\u7b26\u4e32\u4e2d\u51fa\u73b0\u7684\u6b21\u6570\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u793a\u4f8b\uff1a<\/p>\n<\/p>\n

text = "hello world, hello Python"<\/p>\n
count_hello = text.count("hello")<\/p>\n
print(f"'hello'\u51fa\u73b0\u7684\u6b21\u6570\u662f: {count_hello}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528\u4e86count<\/code>\u65b9\u6cd5\u6765\u7edf\u8ba1\u5b57\u7b26\u4e32"hello"<\/code>\u5728text<\/code>\u4e2d\u51fa\u73b0\u7684\u6b21\u6570\u3002<\/p>\n<\/p>\n
2. \u5217\u8868\u4e2d\u7684count\u65b9\u6cd5<\/h4>\n<\/p>\n
\u5bf9\u4e8e\u5217\u8868\u5bf9\u8c61\uff0ccount<\/code>\u65b9\u6cd5\u7528\u4e8e\u7edf\u8ba1\u5217\u8868\u4e2d\u67d0\u4e2a\u5143\u7d20\u51fa\u73b0\u7684\u6b21\u6570\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u793a\u4f8b\uff1a<\/p>\n<\/p>\n
numbers = [1, 2, 3, 4, 5, 3, 2, 3]<\/p>\n
count_of_3 = numbers.count(3)<\/p>\n
print(f"\u6570\u5b573\u51fa\u73b0\u7684\u6b21\u6570\u662f: {count_of_3}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528\u4e86count<\/code>\u65b9\u6cd5\u6765\u7edf\u8ba1\u6570\u5b573<\/code>\u5728\u5217\u8868numbers<\/code>\u4e2d\u51fa\u73b0\u7684\u6b21\u6570\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528collections\u6a21\u5757<\/h3>\n<\/p>\n
collections<\/code>\u6a21\u5757\u63d0\u4f9b\u4e86\u4e00\u4e2a\u5f3a\u5927\u7684Counter<\/code>\u7c7b\uff0c\u7528\u4e8e\u7edf\u8ba1\u53ef\u8fed\u4ee3\u5bf9\u8c61\u4e2d\u5143\u7d20\u7684\u51fa\u73b0\u6b21\u6570\u3002\u5b83\u4e0d\u4ec5\u53ef\u4ee5\u7528\u4e8e\u5217\u8868\u548c\u5b57\u7b26\u4e32\uff0c\u8fd8\u53ef\u4ee5\u7528\u4e8e\u5176\u4ed6\u4efb\u4f55\u53ef\u8fed\u4ee3\u5bf9\u8c61\u3002<\/p>\n<\/p>\n
1. \u4f7f\u7528Counter\u7edf\u8ba1\u5217\u8868\u5143\u7d20<\/h4>\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)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528Counter<\/code>\u6765\u7edf\u8ba1\u5217\u8868colors<\/code>\u4e2d\u5404\u4e2a\u989c\u8272\u51fa\u73b0\u7684\u6b21\u6570\u3002Counter<\/code>\u8fd4\u56de\u4e00\u4e2a\u5b57\u5178\uff0c\u5176\u4e2d\u952e\u662f\u5143\u7d20\uff0c\u503c\u662f\u51fa\u73b0\u7684\u6b21\u6570\u3002<\/p>\n<\/p>\n
2. \u4f7f\u7528Counter\u7edf\u8ba1\u5b57\u7b26\u4e32\u5b57\u7b26<\/h4>\n<\/p>\n
from collections import Counter<\/p>\n
word = "abracadabra"<\/p>\n
letter_count = Counter(word)<\/p>\n
print(letter_count)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cCounter<\/code>\u7edf\u8ba1\u5b57\u7b26\u4e32word<\/code>\u4e2d\u6bcf\u4e2a\u5b57\u7b26\u51fa\u73b0\u7684\u6b21\u6570\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528pandas\u5e93<\/h3>\n<\/p>\n
\u5bf9\u4e8e\u9700\u8981\u5904\u7406\u5927\u89c4\u6a21\u6570\u636e\u7684\u5e94\u7528\uff0cpandas<\/code>\u5e93\u63d0\u4f9b\u4e86\u66f4\u4e3a\u5f3a\u5927\u7684\u529f\u80fd\u3002pandas<\/code>\u7684Series<\/code>\u5bf9\u8c61\u6709\u4e00\u4e2avalue_counts<\/code>\u65b9\u6cd5\uff0c\u53ef\u4ee5\u65b9\u4fbf\u5730\u7edf\u8ba1\u6570\u636e\u3002<\/p>\n<\/p>\n
1. \u4f7f\u7528pandas\u7edf\u8ba1\u6570\u636e\u5217\u7684\u9891\u7387<\/h4>\n<\/p>\n
import pandas as pd<\/p>\n
data = pd.Series(['apple', 'banana', 'apple', 'orange', 'banana', 'banana'])<\/p>\n
fruit_count = data.value_counts()<\/p>\n
print(fruit_count)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u521b\u5efa\u4e86\u4e00\u4e2apandas<\/code>\u7684Series<\/code>\u5bf9\u8c61\uff0c\u5e76\u4f7f\u7528value_counts<\/code>\u65b9\u6cd5\u7edf\u8ba1\u5176\u4e2d\u6bcf\u79cd\u6c34\u679c\u51fa\u73b0\u7684\u6b21\u6570\u3002<\/p>\n<\/p>\n
\u56db\u3001\u5e94\u7528\u573a\u666f\u4e0e\u9009\u62e9<\/h3>\n<\/p>\n
\u6839\u636e\u4e0d\u540c\u7684\u5e94\u7528\u573a\u666f\uff0c\u9009\u62e9\u5408\u9002\u7684\u7edf\u8ba1\u65b9\u6cd5\u53ef\u4ee5\u63d0\u9ad8\u6548\u7387\u548c\u4ee3\u7801\u53ef\u8bfb\u6027\u3002<\/p>\n<\/p>\n
1. \u5c0f\u89c4\u6a21\u6570\u636e<\/h4>\n<\/p>\n
\u5bf9\u4e8e\u5c0f\u89c4\u6a21\u6570\u636e\uff08\u5982\u7b80\u5355\u7684\u5b57\u7b26\u4e32\u6216\u77ed\u5217\u8868\uff09\uff0c\u4f7f\u7528\u5185\u7f6e\u7684count<\/code>\u65b9\u6cd5\u662f\u6700\u7b80\u5355\u76f4\u63a5\u7684\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
2. \u9700\u8981\u7edf\u8ba1\u9891\u7387\u5206\u5e03<\/h4>\n<\/p>\n
\u5982\u679c\u9700\u8981\u7edf\u8ba1\u9891\u7387\u5206\u5e03\uff0c\u5e76\u4e14\u6570\u636e\u91cf\u4e2d\u7b49\uff0c\u53ef\u4ee5\u4f7f\u7528collections.Counter<\/code>\u3002\u5b83\u63d0\u4f9b\u4e86\u7075\u6d3b\u7684\u529f\u80fd\uff0c\u5e76\u4e14\u53ef\u4ee5\u4e0e\u5176\u4ed6collections<\/code>\u5de5\u5177\u7ed3\u5408\u4f7f\u7528\u3002<\/p>\n<\/p>\n
3. \u5927\u89c4\u6a21\u6570\u636e\u5904\u7406<\/h4>\n<\/p>\n
\u5bf9\u4e8e\u5927\u89c4\u6a21\u6570\u636e\u5904\u7406\uff0c\u5c24\u5176\u662f\u6570\u636e\u5206\u6790\u4efb\u52a1\uff0cpandas<\/code>\u5e93\u7684value_counts<\/code>\u65b9\u6cd5\u662f\u6700\u4f73\u9009\u62e9\u3002\u5b83\u4e0d\u4ec5\u529f\u80fd\u5f3a\u5927\uff0c\u8fd8\u80fd\u4e0epandas<\/code>\u7684\u5176\u4ed6\u5206\u6790\u5de5\u5177\u65e0\u7f1d\u96c6\u6210\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u6027\u80fd\u8003\u8651<\/h3>\n<\/p>\n
\u5728\u9009\u62e9\u7edf\u8ba1\u65b9\u6cd5\u65f6\uff0c\u6027\u80fd\u662f\u4e00\u4e2a\u91cd\u8981\u7684\u8003\u8651\u56e0\u7d20\u3002\u4e00\u822c\u6765\u8bf4\uff0c\u5185\u7f6e\u65b9\u6cd5\u548ccollections.Counter<\/code>\u5bf9\u4e8e\u5c0f\u6570\u636e\u96c6\u7684\u6027\u80fd\u76f8\u5bf9\u8f83\u597d\uff0c\u800cpandas<\/code>\u5728\u5904\u7406\u5927\u6570\u636e\u65f6\u8868\u73b0\u51fa\u8272\u3002<\/p>\n<\/p>\n
1. \u5185\u7f6e\u65b9\u6cd5\u7684\u6027\u80fd<\/h4>\n<\/p>\n
\u5185\u7f6e\u7684count<\/code>\u65b9\u6cd5\u5728\u5904\u7406\u7b80\u5355\u6570\u636e\u65f6\u6027\u80fd\u4f18\u5f02\uff0c\u56e0\u4e3a\u5b83\u76f4\u63a5\u5728C\u7ea7\u522b\u5b9e\u73b0\uff0c\u6548\u7387\u975e\u5e38\u9ad8\u3002<\/p>\n<\/p>\n
2. Counter\u7684\u6027\u80fd<\/h4>\n<\/p>\n
Counter<\/code>\u5728\u5904\u7406\u4e2d\u7b49\u89c4\u6a21\u7684\u6570\u636e\u65f6\u6027\u80fd\u826f\u597d\uff0c\u5c24\u5176\u662f\u5728\u9700\u8981\u9891\u7387\u5206\u5e03\u7684\u60c5\u51b5\u4e0b\uff0c\u5b83\u7684\u5b57\u5178\u5b9e\u73b0\u4f7f\u5f97\u67e5\u627e\u548c\u66f4\u65b0\u64cd\u4f5c\u975e\u5e38\u9ad8\u6548\u3002<\/p>\n<\/p>\n
3. pandas\u7684\u6027\u80fd<\/h4>\n<\/p>\n
pandas<\/code>\u7684value_counts<\/code>\u5728\u5904\u7406\u5927\u89c4\u6a21\u6570\u636e\u65f6\u8868\u73b0\u51fa\u8272\uff0c\u56e0\u4e3apandas<\/code>\u5e95\u5c42\u4f7f\u7528\u4e86\u9ad8\u5ea6\u4f18\u5316\u7684C\u548cCython\u4ee3\u7801\uff0c\u53ef\u4ee5\u5feb\u901f\u5730\u5904\u7406\u6570\u636e\u3002<\/p>\n<\/p>\n
\u516d\u3001\u603b\u7ed3\u4e0e\u5efa\u8bae<\/h3>\n<\/p>\n
\u5728\u4f7f\u7528Python\u8fdb\u884c\u6570\u636e\u7edf\u8ba1\u65f6\uff0c\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u53ef\u4ee5\u663e\u8457\u63d0\u9ad8\u4ee3\u7801\u7684\u6548\u7387\u548c\u7b80\u6d01\u6027\u3002\u5bf9\u4e8e\u7b80\u5355\u7684\u4efb\u52a1\uff0c\u5185\u7f6e\u7684count<\/code>\u65b9\u6cd5\u5df2\u7ecf\u8db3\u591f\uff1b\u5bf9\u4e8e\u9700\u8981\u66f4\u590d\u6742\u7edf\u8ba1\u7684\u4efb\u52a1\uff0ccollections.Counter<\/code>\u63d0\u4f9b\u4e86\u7075\u6d3b\u6027\uff1b\u800c\u5728\u5927\u6570\u636e\u73af\u5883\u4e0b\uff0cpandas<\/code>\u7684\u5f3a\u5927\u529f\u80fd\u5219\u662f\u4e0d\u53ef\u6216\u7f3a\u7684\u3002\u6839\u636e\u5177\u4f53\u7684\u5e94\u7528\u573a\u666f\u548c\u6570\u636e\u89c4\u6a21\uff0c\u5408\u7406\u9009\u62e9\u5de5\u5177\u662f\u5173\u952e\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
 \u5982\u4f55\u5728Python\u4e2d\u7edf\u8ba1\u5b57\u7b26\u4e32\u4e2d\u6bcf\u4e2a\u5b57\u7b26\u7684\u51fa\u73b0\u6b21\u6570\uff1f<\/strong>
\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528collections<\/code>\u6a21\u5757\u4e2d\u7684Counter<\/code>\u7c7b\u6765\u7edf\u8ba1\u5b57\u7b26\u4e32\u4e2d\u6bcf\u4e2a\u5b57\u7b26\u7684\u51fa\u73b0\u6b21\u6570\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\u4ee3\u7801\uff1a  <\/p>\n
from collections import Counter\n\ntext = "hello world"\ncount = Counter(text)\nprint(count)\n<\/code><\/pre>\n
\u8fd9\u5c06\u8f93\u51fa\u4e00\u4e2a\u5b57\u5178\uff0c\u663e\u793a\u6bcf\u4e2a\u5b57\u7b26\u53ca\u5176\u51fa\u73b0\u7684\u6b21\u6570\u3002<\/p>\n
\u5728Python\u4e2d\u5982\u4f55\u7edf\u8ba1\u5217\u8868\u4e2d\u5143\u7d20\u7684\u9891\u7387\uff1f<\/strong>
\u8981\u7edf\u8ba1\u5217\u8868\u4e2d\u6bcf\u4e2a\u5143\u7d20\u7684\u9891\u7387\uff0cCounter<\/code>\u7c7b\u540c\u6837\u9002\u7528\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\uff1a  <\/p>\n
from collections import Counter\n\nmy_list = [1, 2, 2, 3, 3, 3, 4]\ncount = Counter(my_list)\nprint(count)\n<\/code><\/pre>\n
\u8fd9\u6bb5\u4ee3\u7801\u5c06\u8fd4\u56de\u6bcf\u4e2a\u5143\u7d20\u53ca\u5176\u5728\u5217\u8868\u4e2d\u51fa\u73b0\u7684\u6b21\u6570\uff0c\u65b9\u4fbf\u8fdb\u884c\u6570\u636e\u5206\u6790\u3002<\/p>\n
\u4f7f\u7528Pandas\u5e93\u7edf\u8ba1DataFrame\u4e2d\u67d0\u5217\u7684\u503c\u51fa\u73b0\u6b21\u6570\u7684\u6700\u4f73\u65b9\u6cd5\u662f\u4ec0\u4e48\uff1f<\/strong>
\u5728Pandas\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528value_counts()<\/code>\u51fd\u6570\u6765\u7edf\u8ba1DataFrame\u67d0\u5217\u4e2d\u6bcf\u4e2a\u503c\u7684\u51fa\u73b0\u6b21\u6570\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a  <\/p>\n
import pandas as pd\n\ndata = {'Name': ['Alice', 'Bob', 'Alice', 'Charlie', 'Bob']}\ndf = pd.DataFrame(data)\ncount = df['Name'].value_counts()\nprint(count)\n<\/code><\/pre>\n
\u8fd9\u5c06\u8fd4\u56de\u4e00\u4e2aSeries\uff0c\u663e\u793a\u6bcf\u4e2a\u540d\u5b57\u53ca\u5176\u51fa\u73b0\u7684\u6b21\u6570\uff0c\u975e\u5e38\u9002\u5408\u8fdb\u884c\u6570\u636e\u5206\u6790\u548c\u53ef\u89c6\u5316\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u4f7f\u7528Python\u7edf\u8ba1count\u7684\u65b9\u6cd5\u6709\u591a\u79cd\uff0c\u5305\u62ec\u4f7f\u7528\u5185\u7f6e\u51fd\u6570\u3001collections\u6a21\u5757\u3001pandas\u5e93\u7b49\u3002\u5bf9 […]","protected":false},"author":3,"featured_media":1001132,"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\/1001117"}],"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=1001117"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1001117\/revisions"}],"predecessor-version":[{"id":1001133,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1001117\/revisions\/1001133"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1001132"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1001117"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1001117"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1001117"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}