{"id":989088,"date":"2024-12-27T08:08:20","date_gmt":"2024-12-27T00:08:20","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/989088.html"},"modified":"2024-12-27T08:08:23","modified_gmt":"2024-12-27T00:08:23","slug":"%e5%a6%82%e4%bd%95python%e5%88%97%e8%a1%a8%e7%9a%84%e4%b8%8b%e8%a1%a8","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/989088.html","title":{"rendered":"\u5982\u4f55python\u5217\u8868\u7684\u4e0b\u8868"},"content":{"rendered":"

\"\u5982\u4f55python\u5217\u8868\u7684\u4e0b\u8868\"<\/p>\n

\u5728Python\u4e2d\uff0c\u83b7\u53d6\u5217\u8868\u7684\u4e0b\u6807\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u6cd5\u5b9e\u73b0\uff0c\u5305\u62ec\u4f7f\u7528enumerate()<\/code>\u51fd\u6570\u3001index()<\/code>\u65b9\u6cd5\u7b49\u3002\u4f7f\u7528enumerate()<\/code>\u51fd\u6570\u53ef\u4ee5\u5728\u904d\u5386\u5217\u8868\u65f6\u540c\u65f6\u83b7\u53d6\u5143\u7d20\u53ca\u5176\u4e0b\u6807\uff0c\u800cindex()<\/code>\u65b9\u6cd5\u5219\u7528\u4e8e\u67e5\u627e\u7279\u5b9a\u5143\u7d20\u7684\u4e0b\u6807\u3002<\/strong><\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528 enumerate()<\/code> \u51fd\u6570<\/p>\n<\/p>\n

enumerate()<\/code> \u51fd\u6570\u662fPython\u5185\u7f6e\u7684\u4e00\u4e2a\u975e\u5e38\u5b9e\u7528\u7684\u51fd\u6570\uff0c\u53ef\u4ee5\u5728\u904d\u5386\u5217\u8868\u65f6\u540c\u65f6\u83b7\u53d6\u5143\u7d20\u53ca\u5176\u4e0b\u6807\u3002\u8fd9\u4e2a\u65b9\u6cd5\u7279\u522b\u9002\u7528\u4e8e\u9700\u8981\u5bf9\u5217\u8868\u8fdb\u884c\u8fed\u4ee3\u7684\u573a\u5408\uff0c\u56e0\u4e3a\u5b83\u80fd\u591f\u5728\u4e00\u6b21\u5faa\u73af\u4e2d\u540c\u65f6\u83b7\u53d6\u5230\u5143\u7d20\u548c\u7d22\u5f15\u3002<\/p>\n<\/p>\n

fruits = ['apple', 'banana', 'cherry']<\/p>\n
for index, fruit in enumerate(fruits):<\/p>\n
    print(f"The index of {fruit} is {index}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u5229\u7528 enumerate()<\/code> \u51fd\u6570\u904d\u5386\u4e86 fruits<\/code> \u5217\u8868\uff0c\u5e76\u5728\u5faa\u73af\u8fc7\u7a0b\u4e2d\u540c\u65f6\u83b7\u53d6\u6bcf\u4e2a\u5143\u7d20\u53ca\u5176\u5bf9\u5e94\u7684\u4e0b\u6807\u3002enumerate()<\/code> \u51fd\u6570\u9ed8\u8ba4\u4ece0\u5f00\u59cb\u8ba1\u6570\uff0c\u4f46\u662f\u53ef\u4ee5\u901a\u8fc7 start<\/code> \u53c2\u6570\u6307\u5b9a\u8d77\u59cb\u503c\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528 index()<\/code> \u65b9\u6cd5<\/p>\n<\/p>\n
index()<\/code> \u65b9\u6cd5\u7528\u4e8e\u83b7\u53d6\u5217\u8868\u4e2d\u6307\u5b9a\u5143\u7d20\u7684\u4e0b\u6807\u3002\u5f53\u5217\u8868\u4e2d\u5b58\u5728\u91cd\u590d\u5143\u7d20\u65f6\uff0cindex()<\/code> \u65b9\u6cd5\u53ea\u4f1a\u8fd4\u56de\u7b2c\u4e00\u4e2a\u5339\u914d\u5143\u7d20\u7684\u4e0b\u6807\u3002\u56e0\u6b64\uff0c\u5728\u4f7f\u7528\u8be5\u65b9\u6cd5\u65f6\u9700\u8981\u786e\u4fdd\u5217\u8868\u4e2d\u6ca1\u6709\u91cd\u590d\u7684\u76ee\u6807\u5143\u7d20\uff0c\u6216\u8005\u660e\u786e\u53ea\u9700\u8981\u7b2c\u4e00\u4e2a\u5339\u914d\u9879\u7684\u4e0b\u6807\u3002<\/p>\n<\/p>\n
fruits = ['apple', 'banana', 'cherry']<\/p>\n
index_of_banana = fruits.index('banana')<\/p>\n
print(f"The index of 'banana' is {index_of_banana}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528 index()<\/code> \u65b9\u6cd5\u67e5\u627e\u4e86 'banana'<\/code> \u5728 fruits<\/code> \u5217\u8868\u4e2d\u7684\u4e0b\u6807\u3002\u5982\u679c 'banana'<\/code> \u4e0d\u5728\u5217\u8868\u4e2d\uff0cindex()<\/code> \u65b9\u6cd5\u5c06\u5f15\u53d1 ValueError<\/code> \u5f02\u5e38\u3002\u56e0\u6b64\uff0c\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u53ef\u4ee5\u7ed3\u5408\u5f02\u5e38\u5904\u7406\u673a\u5236\u6765\u63d0\u9ad8\u4ee3\u7801\u7684\u5065\u58ee\u6027\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u901a\u8fc7\u5217\u8868\u63a8\u5bfc\u5f0f\u83b7\u53d6\u4e0b\u6807<\/p>\n<\/p>\n
\u9664\u4e86\u4e0a\u8ff0\u65b9\u6cd5\uff0c\u8fd8\u53ef\u4ee5\u4f7f\u7528\u5217\u8868\u63a8\u5bfc\u5f0f\u7ed3\u5408\u6761\u4ef6\u5224\u65ad\u6765\u83b7\u53d6\u7279\u5b9a\u6761\u4ef6\u4e0b\u7684\u5143\u7d20\u4e0b\u6807\u3002\u8fd9\u79cd\u65b9\u6cd5\u7075\u6d3b\u6027\u8f83\u9ad8\uff0c\u9002\u5408\u7528\u4e8e\u9700\u8981\u5bf9\u5217\u8868\u8fdb\u884c\u590d\u6742\u6761\u4ef6\u7b5b\u9009\u7684\u573a\u5408\u3002<\/p>\n<\/p>\n
fruits = ['apple', 'banana', 'cherry', 'banana']<\/p>\n
indexes_of_banana = [index for index, fruit in enumerate(fruits) if fruit == 'banana']<\/p>\n
print(f"The indexes of 'banana' are {indexes_of_banana}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8be5\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528\u5217\u8868\u63a8\u5bfc\u5f0f\u7ed3\u5408 enumerate()<\/code> \u51fd\u6570\u5b9e\u73b0\u4e86\u5bf9 fruits<\/code> \u5217\u8868\u7684\u6761\u4ef6\u7b5b\u9009\uff0c\u83b7\u53d6\u5230\u6240\u6709 'banana'<\/code> \u5143\u7d20\u7684\u4e0b\u6807\u3002<\/p>\n<\/p>\n
\u56db\u3001\u4f7f\u7528 numpy<\/code> \u5e93\u8fdb\u884c\u64cd\u4f5c<\/p>\n<\/p>\n
\u5bf9\u4e8e\u5927\u578b\u6570\u636e\u96c6\u6216\u9700\u8981\u8fdb\u884c\u590d\u6742\u6570\u636e\u5206\u6790\u7684\u573a\u5408\uff0c\u53ef\u4ee5\u4f7f\u7528 numpy<\/code> \u5e93\u6765\u83b7\u53d6\u5217\u8868\u7684\u4e0b\u6807\u3002numpy<\/code> \u63d0\u4f9b\u4e86\u9ad8\u6548\u7684\u6570\u7ec4\u64cd\u4f5c\u548c\u9ad8\u7ea7\u51fd\u6570\uff0c\u4f7f\u5176\u5728\u79d1\u5b66\u8ba1\u7b97\u548c\u6570\u636e\u5206\u6790\u9886\u57df\u975e\u5e38\u6d41\u884c\u3002<\/p>\n<\/p>\n
import numpy as np<\/p>\n
fruits = np.array(['apple', 'banana', 'cherry', 'banana'])<\/p>\n
indexes_of_banana = np.where(fruits == 'banana')[0]<\/p>\n
print(f"The indexes of 'banana' are {indexes_of_banana}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528 numpy<\/code> \u7684 where<\/code> \u51fd\u6570\u67e5\u627e\u4e86 'banana'<\/code> \u7684\u6240\u6709\u4e0b\u6807\u3002numpy<\/code> \u7684\u6570\u7ec4\u64cd\u4f5c\u5728\u6027\u80fd\u4e0a\u4f18\u4e8ePython\u7684\u5185\u7f6e\u5217\u8868\uff0c\u9002\u5408\u5904\u7406\u5927\u89c4\u6a21\u6570\u636e\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u83b7\u53d6\u591a\u7ef4\u5217\u8868\u7684\u4e0b\u6807<\/p>\n<\/p>\n
\u5728\u5904\u7406\u591a\u7ef4\u5217\u8868\u65f6\uff0c\u83b7\u53d6\u5143\u7d20\u7684\u4e0b\u6807\u76f8\u5bf9\u590d\u6742\u3002\u53ef\u4ee5\u901a\u8fc7\u5d4c\u5957\u5faa\u73af\u6216\u8005\u9012\u5f52\u51fd\u6570\u6765\u83b7\u53d6\u591a\u7ef4\u5217\u8868\u4e2d\u5143\u7d20\u7684\u4e0b\u6807\u3002<\/p>\n<\/p>\n
matrix = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]<\/p>\n
for i, row in enumerate(matrix):<\/p>\n
    for j, value in enumerate(row):<\/p>\n
        print(f"The index of {value} is ({i}, {j})")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528\u5d4c\u5957\u5faa\u73af\u904d\u5386\u4e86\u4e00\u4e2a\u4e8c\u7ef4\u5217\u8868 matrix<\/code>\uff0c\u5e76\u83b7\u53d6\u5230\u6bcf\u4e2a\u5143\u7d20\u7684\u4e8c\u7ef4\u4e0b\u6807\u3002<\/p>\n<\/p>\n
\u516d\u3001\u7ed3\u5408\u6761\u4ef6\u7b5b\u9009\u83b7\u53d6\u4e0b\u6807<\/p>\n<\/p>\n
\u5728\u67d0\u4e9b\u573a\u5408\uff0c\u6211\u4eec\u9700\u8981\u6839\u636e\u7279\u5b9a\u6761\u4ef6\u7b5b\u9009\u51fa\u7b26\u5408\u6761\u4ef6\u7684\u5143\u7d20\u4e0b\u6807\u3002\u8fd9\u53ef\u4ee5\u901a\u8fc7\u7ed3\u5408\u6761\u4ef6\u5224\u65ad\u548c enumerate()<\/code> \u51fd\u6570\u5b9e\u73b0\u3002<\/p>\n<\/p>\n
numbers = [10, 20, 30, 40, 50]<\/p>\n
indexes_of_large_numbers = [index for index, number in enumerate(numbers) if number > 25]<\/p>\n
print(f"The indexes of numbers greater than 25 are {indexes_of_large_numbers}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u6b64\u4f8b\u4e2d\uff0c\u6211\u4eec\u901a\u8fc7\u5217\u8868\u63a8\u5bfc\u5f0f\u7ed3\u5408\u6761\u4ef6\u5224\u65ad\u7b5b\u9009\u51fa numbers<\/code> \u5217\u8868\u4e2d\u6240\u6709\u5927\u4e8e25\u7684\u5143\u7d20\u7684\u4e0b\u6807\u3002<\/p>\n<\/p>\n
\u4e03\u3001\u5728\u5b57\u5178\u4e2d\u4f7f\u7528\u4e0b\u6807\u6982\u5ff5<\/p>\n<\/p>\n
\u867d\u7136\u5b57\u5178\u662f\u952e\u503c\u5bf9\u7684\u96c6\u5408\uff0c\u901a\u5e38\u6ca1\u6709\u4e0b\u6807\u7684\u6982\u5ff5\uff0c\u4f46\u5728\u67d0\u4e9b\u573a\u5408\u53ef\u4ee5\u901a\u8fc7\u5c06\u5b57\u5178\u7684\u952e\u6216\u503c\u89c6\u4e3a\u5217\u8868\u6765\u83b7\u53d6\u201c\u4e0b\u6807\u201d\u3002\u8fd9\u5728\u9700\u8981\u904d\u5386\u5b57\u5178\u5e76\u83b7\u53d6\u952e\u6216\u503c\u7684\u201c\u4f4d\u7f6e\u201d\u65f6\u975e\u5e38\u6709\u7528\u3002<\/p>\n<\/p>\n
fruit_prices = {'apple': 1.2, 'banana': 0.5, 'cherry': 1.5}<\/p>\n
keys = list(fruit_prices.keys())<\/p>\n
values = list(fruit_prices.values())<\/p>\n
index_of_banana = keys.index('banana')<\/p>\n
print(f"The index of 'banana' in keys is {index_of_banana}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u5c06\u5b57\u5178\u7684\u952e\u548c\u503c\u8f6c\u5316\u4e3a\u5217\u8868\uff0c\u4ece\u800c\u53ef\u4ee5\u4f7f\u7528 index()<\/code> \u65b9\u6cd5\u83b7\u53d6\u7279\u5b9a\u952e\u7684\u201c\u4e0b\u6807\u201d\u3002<\/p>\n<\/p>\n
\u901a\u8fc7\u4e0a\u8ff0\u591a\u79cd\u65b9\u6cd5\uff0c\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u9700\u6c42\u7075\u6d3b\u9009\u62e9\u83b7\u53d6Python\u5217\u8868\u4e0b\u6807\u7684\u65b9\u5f0f\u3002\u65e0\u8bba\u662f\u7b80\u5355\u7684\u7d22\u5f15\u83b7\u53d6\uff0c\u8fd8\u662f\u590d\u6742\u7684\u6761\u4ef6\u7b5b\u9009\uff0cPython\u90fd\u63d0\u4f9b\u4e86\u5f3a\u5927\u7684\u5de5\u5177\u652f\u6301\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
 Python\u5217\u8868\u7684\u4e0b\u6807\u662f\u4ec0\u4e48\uff1f\u5982\u4f55\u4f7f\u7528\u5b83\u4eec\uff1f<\/strong>
Python\u5217\u8868\u7684\u4e0b\u6807\u662f\u6307\u5217\u8868\u4e2d\u6bcf\u4e2a\u5143\u7d20\u7684\u7d22\u5f15\u4f4d\u7f6e\uff0c\u901a\u5e38\u4ece0\u5f00\u59cb\u3002\u4f8b\u5982\uff0c\u5728\u4e00\u4e2a\u5305\u542b\u4e94\u4e2a\u5143\u7d20\u7684\u5217\u8868\u4e2d\uff0c\u7b2c\u4e00\u4e2a\u5143\u7d20\u7684\u4e0b\u6807\u662f0\uff0c\u7b2c\u4e8c\u4e2a\u5143\u7d20\u662f1\uff0c\u4ee5\u6b64\u7c7b\u63a8\u3002\u4f7f\u7528\u4e0b\u6807\u53ef\u4ee5\u65b9\u4fbf\u5730\u8bbf\u95ee\u6216\u4fee\u6539\u7279\u5b9a\u4f4d\u7f6e\u7684\u5143\u7d20\uff0c\u5982my_list[0]<\/code>\u83b7\u53d6\u7b2c\u4e00\u4e2a\u5143\u7d20\uff0cmy_list[2] = '\u65b0\u503c'<\/code>\u53ef\u4ee5\u5c06\u7b2c\u4e09\u4e2a\u5143\u7d20\u66f4\u6539\u4e3a\u201c\u65b0\u503c\u201d\u3002<\/p>\n
\u5982\u4f55\u5728Python\u4e2d\u627e\u5230\u5217\u8868\u4e2d\u7279\u5b9a\u5143\u7d20\u7684\u4e0b\u6807\uff1f<\/strong>
\u8981\u627e\u5230\u5217\u8868\u4e2d\u67d0\u4e2a\u7279\u5b9a\u5143\u7d20\u7684\u4e0b\u6807\uff0c\u53ef\u4ee5\u4f7f\u7528index()<\/code>\u65b9\u6cd5\u3002\u6bd4\u5982\uff0c\u5982\u679c\u6709\u4e00\u4e2a\u5217\u8868my_list = [10, 20, 30, 40]<\/code>\uff0c\u8981\u627e\u5230\u5143\u7d2030\u7684\u4e0b\u6807\uff0c\u53ef\u4ee5\u4f7f\u7528my_list.index(30)<\/code>\uff0c\u8fd9\u5c06\u8fd4\u56de2\uff0c\u56e0\u4e3a30\u662f\u5217\u8868\u4e2d\u7684\u7b2c\u4e09\u4e2a\u5143\u7d20\u3002<\/p>\n
Python\u5217\u8868\u652f\u6301\u8d1f\u4e0b\u6807\u5417\uff1f\u5982\u4f55\u4f7f\u7528\uff1f<\/strong>
\u662f\u7684\uff0cPython\u5217\u8868\u652f\u6301\u8d1f\u4e0b\u6807\uff0c\u8fd9\u6837\u53ef\u4ee5\u4ece\u5217\u8868\u7684\u672b\u5c3e\u5f00\u59cb\u8bbf\u95ee\u5143\u7d20\u3002\u4f8b\u5982\uff0cmy_list[-1]<\/code>\u4ee3\u8868\u5217\u8868\u4e2d\u7684\u6700\u540e\u4e00\u4e2a\u5143\u7d20\uff0cmy_list[-2]<\/code>\u4ee3\u8868\u5012\u6570\u7b2c\u4e8c\u4e2a\u5143\u7d20\u3002\u8fd9\u79cd\u65b9\u5f0f\u7279\u522b\u65b9\u4fbf\uff0c\u53ef\u4ee5\u5feb\u901f\u8bbf\u95ee\u5217\u8868\u5c3e\u90e8\u7684\u6570\u636e\uff0c\u800c\u65e0\u9700\u8ba1\u7b97\u603b\u957f\u5ea6\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Python\u4e2d\uff0c\u83b7\u53d6\u5217\u8868\u7684\u4e0b\u6807\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u6cd5\u5b9e\u73b0\uff0c\u5305\u62ec\u4f7f\u7528enumerate()\u51fd\u6570\u3001index()\u65b9\u6cd5\u7b49 […]","protected":false},"author":3,"featured_media":989101,"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\/989088"}],"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=989088"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/989088\/revisions"}],"predecessor-version":[{"id":989102,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/989088\/revisions\/989102"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/989101"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=989088"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=989088"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=989088"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}