{"id":937408,"date":"2024-12-26T19:51:13","date_gmt":"2024-12-26T11:51:13","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/937408.html"},"modified":"2024-12-26T19:51:16","modified_gmt":"2024-12-26T11:51:16","slug":"python%e5%a6%82%e4%bd%95%e9%81%8d%e5%8e%86map","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/937408.html","title":{"rendered":"python\u5982\u4f55\u904d\u5386map"},"content":{"rendered":"

\"python\u5982\u4f55\u904d\u5386map\"<\/p>\n

\u5728Python\u4e2d\uff0c\u904d\u5386map\u53ef\u4ee5\u901a\u8fc7\u51e0\u79cd\u4e0d\u540c\u7684\u65b9\u6cd5\u6765\u5b9e\u73b0\uff0c\u4f7f\u7528for\u5faa\u73af\u904d\u5386\u3001\u4f7f\u7528items()\u65b9\u6cd5\u904d\u5386\u3001\u4f7f\u7528keys()\u65b9\u6cd5\u904d\u5386\u3001\u4f7f\u7528values()\u65b9\u6cd5\u904d\u5386<\/strong>\u3002\u5176\u4e2d\uff0c\u4f7f\u7528items()<\/code>\u65b9\u6cd5\u662f\u6700\u5e38\u7528\u7684\u65b9\u5f0f\uff0c\u56e0\u4e3a\u5b83\u53ef\u4ee5\u540c\u65f6\u83b7\u53d6\u952e\u548c\u503c\u3002\u4e0b\u9762\u6211\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u8fd9\u51e0\u79cd\u65b9\u6cd5\uff0c\u5e76\u63d0\u4f9b\u4ee3\u7801\u793a\u4f8b\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528FOR\u5faa\u73af\u904d\u5386<\/h3>\n<\/p>\n

Python\u4e2d\u7684\u5b57\u5178\uff08dictionary\uff09\u53ef\u4ee5\u88ab\u89c6\u4e3a\u4e00\u79cdmap\u7ed3\u6784\u3002\u6700\u7b80\u5355\u7684\u65b9\u6cd5\u662f\u76f4\u63a5\u4f7f\u7528for\u5faa\u73af\u6765\u904d\u5386\u5b57\u5178\u7684\u952e\uff1a<\/p>\n<\/p>\n

my_map = {'a': 1, 'b': 2, 'c': 3}<\/p>\n
for key in my_map:<\/p>\n
    print(f"Key: {key}, Value: {my_map[key]}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u76f4\u63a5\u904d\u5386my_map<\/code>\uff0c\u6bcf\u6b21\u5faa\u73af\u83b7\u53d6\u5b57\u5178\u4e2d\u7684\u4e00\u4e2a\u952e\uff0c\u901a\u8fc7\u952e\u6765\u8bbf\u95ee\u5bf9\u5e94\u7684\u503c\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528ITEMS()\u65b9\u6cd5\u904d\u5386<\/h3>\n<\/p>\n
\u4f7f\u7528items()<\/code>\u65b9\u6cd5\u662f\u904d\u5386map\u7684\u6700\u4f73\u65b9\u5f0f\uff0c\u56e0\u4e3a\u5b83\u53ef\u4ee5\u5728\u4e00\u6b21\u5faa\u73af\u4e2d\u540c\u65f6\u83b7\u53d6\u952e\u548c\u503c\uff1a<\/p>\n<\/p>\n
my_map = {'a': 1, 'b': 2, 'c': 3}<\/p>\n
for key, value in my_map.items():<\/p>\n
    print(f"Key: {key}, Value: {value}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u662f\u6700\u63a8\u8350\u7684\u65b9\u5f0f\uff0c\u56e0\u4e3a\u5b83\u7b80\u6d01\u660e\u4e86\uff0c\u6613\u4e8e\u7406\u89e3\u548c\u4f7f\u7528\u3002<\/strong> items()<\/code>\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u5305\u542b\u952e\u503c\u5bf9\u7684\u89c6\u56fe\u5bf9\u8c61\uff0c\u53ef\u4ee5\u65b9\u4fbf\u5730\u8fdb\u884c\u8fed\u4ee3\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528KEYS()\u65b9\u6cd5\u904d\u5386<\/h3>\n<\/p>\n
\u5982\u679c\u53ea\u9700\u8981\u8bbf\u95ee\u5b57\u5178\u4e2d\u7684\u952e\uff0c\u53ef\u4ee5\u4f7f\u7528keys()<\/code>\u65b9\u6cd5\uff1a<\/p>\n<\/p>\n
my_map = {'a': 1, 'b': 2, 'c': 3}<\/p>\n
for key in my_map.keys():<\/p>\n
    print(f"Key: {key}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
keys()<\/code>\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u89c6\u56fe\u5bf9\u8c61\uff0c\u8be5\u5bf9\u8c61\u5c55\u793a\u4e86\u5b57\u5178\u4e2d\u7684\u6240\u6709\u952e\u3002\u8fd9\u5bf9\u4e8e\u53ea\u9700\u8981\u952e\u800c\u4e0d\u9700\u8981\u503c\u7684\u573a\u666f\u662f\u975e\u5e38\u6709\u7528\u7684\u3002<\/p>\n<\/p>\n
\u56db\u3001\u4f7f\u7528VALUES()\u65b9\u6cd5\u904d\u5386<\/h3>\n<\/p>\n
\u7c7b\u4f3c\u4e8ekeys()<\/code>\u65b9\u6cd5\uff0c\u5982\u679c\u53ea\u9700\u8981\u8bbf\u95ee\u5b57\u5178\u4e2d\u7684\u503c\uff0c\u53ef\u4ee5\u4f7f\u7528values()<\/code>\u65b9\u6cd5\uff1a<\/p>\n<\/p>\n
my_map = {'a': 1, 'b': 2, 'c': 3}<\/p>\n
for value in my_map.values():<\/p>\n
    print(f"Value: {value}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
values()<\/code>\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u89c6\u56fe\u5bf9\u8c61\uff0c\u8be5\u5bf9\u8c61\u5c55\u793a\u4e86\u5b57\u5178\u4e2d\u7684\u6240\u6709\u503c\u3002\u8fd9\u5728\u53ea\u9700\u8981\u5904\u7406\u503c\u800c\u4e0d\u5173\u5fc3\u952e\u7684\u573a\u666f\u4e2d\u975e\u5e38\u5b9e\u7528\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u5728\u9ad8\u7ea7\u5e94\u7528\u4e2d\u7684\u904d\u5386<\/h3>\n<\/p>\n
\u5728\u67d0\u4e9b\u9ad8\u7ea7\u5e94\u7528\u4e2d\uff0c\u53ef\u80fd\u9700\u8981\u5bf9map\u8fdb\u884c\u66f4\u590d\u6742\u7684\u904d\u5386\uff0c\u4f8b\u5982\u5728\u5bf9\u6570\u636e\u8fdb\u884c\u6279\u91cf\u5904\u7406\u3001\u5206\u6790\u6216\u8fc7\u6ee4\u65f6\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u66f4\u9ad8\u7ea7\u7684\u904d\u5386\u6280\u5de7\uff1a<\/p>\n<\/p>\n
1. \u4f7f\u7528\u5217\u8868\u63a8\u5bfc\u5f0f<\/h4>\n<\/p>\n
\u53ef\u4ee5\u4f7f\u7528\u5217\u8868\u63a8\u5bfc\u5f0f\u6765\u521b\u5efa\u4e00\u4e2a\u57fa\u4e8emap\u7684\u5217\u8868\u3002\u4f8b\u5982\uff0c\u63d0\u53d6\u6240\u6709\u503c\u5927\u4e8e1\u7684\u952e\uff1a<\/p>\n<\/p>\n
my_map = {'a': 1, 'b': 2, 'c': 3}<\/p>\n
filtered_keys = [key for key, value in my_map.items() if value > 1]<\/p>\n
print(filtered_keys)<\/p>\n
<\/code><\/pre>\n<\/p>\n
2. \u7ed3\u5408\u679a\u4e3e\u548c\u7d22\u5f15<\/h4>\n<\/p>\n
\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u53ef\u80fd\u9700\u8981\u5728\u904d\u5386\u65f6\u83b7\u53d6\u7d22\u5f15\uff0c\u53ef\u4ee5\u7ed3\u5408enumerate<\/code>\u51fd\u6570\uff1a<\/p>\n<\/p>\n
my_map = {'a': 1, 'b': 2, 'c': 3}<\/p>\n
for index, (key, value) in enumerate(my_map.items()):<\/p>\n
    print(f"Index: {index}, Key: {key}, Value: {value}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
3. \u5904\u7406\u5d4c\u5957\u5b57\u5178<\/h4>\n<\/p>\n
\u5728\u5904\u7406\u590d\u6742\u6570\u636e\u7ed3\u6784\u65f6\uff0c\u53ef\u80fd\u4f1a\u9047\u5230\u5d4c\u5957\u5b57\u5178\uff0c\u8fd9\u65f6\u53ef\u4ee5\u901a\u8fc7\u9012\u5f52\u904d\u5386\u6240\u6709\u5c42\u7ea7\uff1a<\/p>\n<\/p>\n
nested_map = {'a': 1, 'b': {'b1': 2, 'b2': 3}, 'c': 4}<\/p>\n
def recursive_traverse(d):<\/p>\n
    for key, value in d.items():<\/p>\n
        if isinstance(value, dict):<\/p>\n
            print(f"Key: {key} (nested)")<\/p>\n
            recursive_traverse(value)<\/p>\n
        else:<\/p>\n
            print(f"Key: {key}, Value: {value}")<\/p>\n
recursive_traverse(nested_map)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u516d\u3001\u603b\u7ed3<\/h3>\n<\/p>\n
Python\u63d0\u4f9b\u4e86\u591a\u79cd\u65b9\u5f0f\u6765\u904d\u5386map\uff08\u5b57\u5178\uff09\uff0c\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u9700\u6c42\u9009\u62e9\u9002\u5408\u7684\u65b9\u6cd5\u3002\u4f7f\u7528items()\u65b9\u6cd5\u662f\u6700\u5e38\u7528\u4e14\u63a8\u8350\u7684\u65b9\u5f0f<\/strong>\uff0c\u56e0\u4e3a\u5b83\u80fd\u591f\u540c\u65f6\u8bbf\u95ee\u952e\u548c\u503c\uff0c\u975e\u5e38\u65b9\u4fbf\u3002\u5728\u9ad8\u7ea7\u5e94\u7528\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u7ed3\u5408\u5217\u8868\u63a8\u5bfc\u5f0f\u3001enumerate<\/code>\u51fd\u6570\u4ee5\u53ca\u9012\u5f52\u7b49\u65b9\u6cd5\uff0c\u6765\u5b9e\u73b0\u66f4\u590d\u6742\u7684\u6570\u636e\u5904\u7406\u548c\u5206\u6790\u3002\u901a\u8fc7\u638c\u63e1\u8fd9\u4e9b\u6280\u5de7\uff0c\u53ef\u4ee5\u5728Python\u7f16\u7a0b\u4e2d\u66f4\u9ad8\u6548\u5730\u5904\u7406map\u6570\u636e\u7ed3\u6784\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
 \u5982\u4f55\u5728Python\u4e2d\u6709\u6548\u5730\u904d\u5386\u5b57\u5178\uff08map\uff09\uff1f<\/strong>
\u5728Python\u4e2d\uff0c\u5b57\u5178\u662f\u4e00\u79cd\u5e38\u7528\u7684\u6570\u636e\u7ed3\u6784\uff0c\u53ef\u4ee5\u4f7f\u7528\u591a\u79cd\u65b9\u5f0f\u8fdb\u884c\u904d\u5386\u3002\u6700\u5e38\u7528\u7684\u65b9\u6cd5\u662f\u4f7f\u7528for<\/code>\u5faa\u73af\u904d\u5386\u5b57\u5178\u7684\u952e\uff0c\u503c\u6216\u952e\u503c\u5bf9\u3002\u60a8\u53ef\u4ee5\u4f7f\u7528items()<\/code>\u65b9\u6cd5\u83b7\u53d6\u6240\u6709\u952e\u503c\u5bf9\uff0c\u4f7f\u7528keys()<\/code>\u65b9\u6cd5\u83b7\u53d6\u6240\u6709\u952e\uff0c\u6216\u4f7f\u7528values()<\/code>\u65b9\u6cd5\u83b7\u53d6\u6240\u6709\u503c\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
my_dict = {'a': 1, 'b': 2, 'c': 3}\n\n# \u904d\u5386\u952e\nfor key in my_dict.keys():\n    print(key)\n\n# \u904d\u5386\u503c\nfor value in my_dict.values():\n    print(value)\n\n# \u904d\u5386\u952e\u503c\u5bf9\nfor key, value in my_dict.items():\n    print(key, value)\n<\/code><\/pre>\n
\u5728\u904d\u5386\u5b57\u5178\u65f6\u662f\u5426\u53ef\u4ee5\u4fee\u6539\u5b57\u5178\u7684\u5185\u5bb9\uff1f<\/strong>
\u5728\u904d\u5386\u5b57\u5178\u65f6\u76f4\u63a5\u4fee\u6539\u5b57\u5178\u7684\u7ed3\u6784\uff08\u5982\u6dfb\u52a0\u6216\u5220\u9664\u952e\u503c\u5bf9\uff09\u662f\u4e0d\u63a8\u8350\u7684\u3002\u8fd9\u53ef\u80fd\u5bfc\u81f4\u8fd0\u884c\u65f6\u9519\u8bef\u6216\u4e0d\u4e00\u81f4\u7684\u7ed3\u679c\u3002\u82e5\u9700\u8981\u5728\u904d\u5386\u65f6\u5bf9\u5b57\u5178\u8fdb\u884c\u4fee\u6539\uff0c\u53ef\u4ee5\u8003\u8651\u5148\u5c06\u9700\u8981\u4fee\u6539\u7684\u9879\u5b58\u50a8\u5728\u4e00\u4e2a\u5217\u8868\u4e2d\uff0c\u904d\u5386\u5b8c\u6210\u540e\u518d\u8fdb\u884c\u4fee\u6539\u3002<\/p>\n
\u5982\u4f55\u5904\u7406\u904d\u5386\u5b57\u5178\u65f6\u7684\u987a\u5e8f\u95ee\u9898\uff1f<\/strong>
Python 3.7\u53ca\u4ee5\u540e\u7684\u7248\u672c\u5b57\u5178\u662f\u4fdd\u6301\u63d2\u5165\u987a\u5e8f\u7684\u3002\u5982\u679c\u60a8\u5e0c\u671b\u6309\u7167\u7279\u5b9a\u7684\u987a\u5e8f\u904d\u5386\u5b57\u5178\uff0c\u4f8b\u5982\u6309\u952e\u7684\u5b57\u6bcd\u987a\u5e8f\u6216\u6309\u503c\u7684\u5927\u5c0f\uff0c\u53ef\u4ee5\u4f7f\u7528sorted()<\/code>\u51fd\u6570\u5bf9\u5b57\u5178\u7684\u952e\u6216\u503c\u8fdb\u884c\u6392\u5e8f\uff0c\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
# \u6309\u952e\u6392\u5e8f\nfor key in sorted(my_dict.keys()):\n    print(key, my_dict[key])\n\n# \u6309\u503c\u6392\u5e8f\nfor key in sorted(my_dict, key=my_dict.get):\n    print(key, my_dict[key])\n<\/code><\/pre>\n
\u901a\u8fc7\u8fd9\u4e9b\u65b9\u6cd5\uff0c\u60a8\u53ef\u4ee5\u7075\u6d3b\u5730\u904d\u5386Python\u4e2d\u7684\u5b57\u5178\uff0c\u6ee1\u8db3\u4e0d\u540c\u7684\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Python\u4e2d\uff0c\u904d\u5386map\u53ef\u4ee5\u901a\u8fc7\u51e0\u79cd\u4e0d\u540c\u7684\u65b9\u6cd5\u6765\u5b9e\u73b0\uff0c\u4f7f\u7528for\u5faa\u73af\u904d\u5386\u3001\u4f7f\u7528items()\u65b9\u6cd5\u904d\u5386\u3001\u4f7f\u7528 […]","protected":false},"author":3,"featured_media":937409,"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\/937408"}],"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=937408"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/937408\/revisions"}],"predecessor-version":[{"id":937410,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/937408\/revisions\/937410"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/937409"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=937408"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=937408"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=937408"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}