{"id":921370,"date":"2024-12-26T14:11:51","date_gmt":"2024-12-26T06:11:51","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/921370.html"},"modified":"2024-12-26T14:11:53","modified_gmt":"2024-12-26T06:11:53","slug":"python%e5%a6%82%e4%bd%95%e9%81%8d%e5%8e%86%e5%ad%97%e5%85%b8","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/921370.html","title":{"rendered":"python\u5982\u4f55\u904d\u5386\u5b57\u5178"},"content":{"rendered":"

\"python\u5982\u4f55\u904d\u5386\u5b57\u5178\"<\/p>\n

\u5728Python\u4e2d\uff0c\u904d\u5386\u5b57\u5178\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u5f0f\u5b9e\u73b0\uff0c\u5305\u62ec\u4f7f\u7528for\u5faa\u73af\u904d\u5386\u952e\u3001\u503c\u6216\u952e\u503c\u5bf9\uff0c\u5229\u7528\u5b57\u5178\u7684\u5185\u7f6e\u65b9\u6cd5\u5982.items()\u3001.keys()\u548c.values()\u7b49\u3002\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u9700\u6c42\u548c\u4ee3\u7801\u98ce\u683c\u8fdb\u884c\u3002\u4f8b\u5982\uff0c\u4f7f\u7528.items()\u65b9\u6cd5\u53ef\u4ee5\u540c\u65f6\u83b7\u53d6\u952e\u548c\u503c\uff0c\u8fd9\u5728\u9700\u8981\u540c\u65f6\u5904\u7406\u4e24\u8005\u65f6\u975e\u5e38\u65b9\u4fbf\u3002<\/strong><\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528for\u5faa\u73af\u904d\u5386\u952e<\/p>\n<\/p>\n

\u5728Python\u4e2d\uff0c\u5b57\u5178\u7684\u9ed8\u8ba4\u904d\u5386\u662f\u5bf9\u952e\u8fdb\u884c\u904d\u5386\u3002\u4f7f\u7528for\u5faa\u73af\u904d\u5386\u5b57\u5178\u65f6\uff0c\u53ef\u4ee5\u76f4\u63a5\u83b7\u53d6\u6bcf\u4e2a\u952e\u3002\u901a\u8fc7\u952e\u8fd8\u53ef\u4ee5\u8f7b\u677e\u8bbf\u95ee\u5bf9\u5e94\u7684\u503c\u3002<\/p>\n<\/p>\n

my_dict = {'a': 1, 'b': 2, 'c': 3}<\/p>\n
for key in my_dict:<\/p>\n
    print(f"Key: {key}, Value: {my_dict[key]}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4ee5\u4e0a\u4ee3\u7801\u4e2d\uff0cmy_dict<\/code>\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u5b57\u5178\uff0cfor\u5faa\u73af\u76f4\u63a5\u904d\u5386\u5b57\u5178\u7684\u952e\uff0c\u7136\u540e\u901a\u8fc7\u952e\u8bbf\u95ee\u5bf9\u5e94\u7684\u503c\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528.items()\u65b9\u6cd5\u904d\u5386\u952e\u503c\u5bf9<\/p>\n<\/p>\n
.items()\u65b9\u6cd5\u662f\u5b57\u5178\u5bf9\u8c61\u7684\u4e00\u4e2a\u65b9\u6cd5\uff0c\u5b83\u8fd4\u56de\u5b57\u5178\u4e2d\u6240\u6709\u952e\u503c\u5bf9\u7684\u89c6\u56fe\u3002\u901a\u8fc7\u4f7f\u7528for\u5faa\u73af\u904d\u5386.items()\uff0c\u53ef\u4ee5\u76f4\u63a5\u83b7\u53d6\u6bcf\u4e2a\u952e\u503c\u5bf9\u3002<\/p>\n<\/p>\n
my_dict = {'a': 1, 'b': 2, 'c': 3}<\/p>\n
for key, value in my_dict.items():<\/p>\n
    print(f"Key: {key}, Value: {value}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u5728\u9700\u8981\u540c\u65f6\u8bbf\u95ee\u952e\u548c\u503c\u7684\u573a\u5408\u4e0b\u5c24\u5176\u6709\u7528\uff0c\u56e0\u4e3a\u5b83\u907f\u514d\u4e86\u5728\u6bcf\u6b21\u8fed\u4ee3\u65f6\u9700\u8981\u901a\u8fc7\u952e\u5355\u72ec\u8bbf\u95ee\u503c\u7684\u6b65\u9aa4\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528.keys()\u65b9\u6cd5\u904d\u5386\u952e<\/p>\n<\/p>\n
\u867d\u7136\u5b57\u5178\u9ed8\u8ba4\u8fed\u4ee3\u952e\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u660e\u786e\u8c03\u7528.keys()\u65b9\u6cd5\u53ef\u4ee5\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u3002\u8fd9\u79cd\u65b9\u6cd5\u7279\u522b\u9002\u7528\u4e8e\u9700\u8981\u5bf9\u952e\u8fdb\u884c\u8fdb\u4e00\u6b65\u64cd\u4f5c\u7684\u573a\u5408\u3002<\/p>\n<\/p>\n
my_dict = {'a': 1, 'b': 2, 'c': 3}<\/p>\n
for key in my_dict.keys():<\/p>\n
    print(f"Key: {key}, Value: {my_dict[key]}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4f7f\u7528.keys()\u65b9\u6cd5\u660e\u786e\u8868\u660e\u6211\u4eec\u53ea\u5bf9\u952e\u611f\u5174\u8da3\uff0c\u8fd9\u79cd\u4ee3\u7801\u98ce\u683c\u6709\u52a9\u4e8e\u5176\u4ed6\u5f00\u53d1\u8005\u5feb\u901f\u7406\u89e3\u4ee3\u7801\u610f\u56fe\u3002<\/p>\n<\/p>\n
\u56db\u3001\u4f7f\u7528.values()\u65b9\u6cd5\u904d\u5386\u503c<\/p>\n<\/p>\n
.values()\u65b9\u6cd5\u8fd4\u56de\u5b57\u5178\u4e2d\u6240\u6709\u503c\u7684\u89c6\u56fe\u3002\u5f53\u53ea\u9700\u8981\u5904\u7406\u5b57\u5178\u4e2d\u7684\u503c\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528.values()\u65b9\u6cd5\u8fdb\u884c\u904d\u5386\u3002<\/p>\n<\/p>\n
my_dict = {'a': 1, 'b': 2, 'c': 3}<\/p>\n
for value in my_dict.values():<\/p>\n
    print(f"Value: {value}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u5728\u53ea\u5173\u6ce8\u5b57\u5178\u503c\u7684\u60c5\u51b5\u4e0b\u975e\u5e38\u6709\u6548\uff0c\u907f\u514d\u4e86\u4e0d\u5fc5\u8981\u7684\u952e\u503c\u5bf9\u5904\u7406\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u5b57\u5178\u63a8\u5bfc\u5f0f<\/p>\n<\/p>\n
\u5b57\u5178\u63a8\u5bfc\u5f0f\u662fPython\u63d0\u4f9b\u7684\u4e00\u79cd\u7b80\u6d01\u7684\u5b57\u5178\u6784\u9020\u65b9\u5f0f\uff0c\u5b83\u53ef\u4ee5\u5728\u904d\u5386\u5b57\u5178\u65f6\u521b\u5efa\u65b0\u7684\u5b57\u5178\u6216\u4fee\u6539\u539f\u6709\u5b57\u5178\u3002<\/p>\n<\/p>\n
my_dict = {'a': 1, 'b': 2, 'c': 3}<\/p>\n
new_dict = {key: value * 2 for key, value in my_dict.items()}<\/p>\n
print(new_dict)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u6b64\u793a\u4f8b\u4e2d\uff0c\u5b57\u5178\u63a8\u5bfc\u5f0f\u7528\u4e8e\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5b57\u5178\uff0c\u5176\u4e2d\u6bcf\u4e2a\u503c\u90fd\u88ab\u4e58\u4ee52\u3002\u5b57\u5178\u63a8\u5bfc\u5f0f\u63d0\u4f9b\u4e86\u4e00\u79cd\u7b80\u6d01\u800c\u5f3a\u5927\u7684\u65b9\u5f0f\u6765\u64cd\u4f5c\u5b57\u5178\u3002<\/p>\n<\/p>\n
\u516d\u3001\u904d\u5386\u5d4c\u5957\u5b57\u5178<\/p>\n<\/p>\n
\u5728\u5904\u7406\u590d\u6742\u6570\u636e\u7ed3\u6784\u65f6\uff0c\u53ef\u80fd\u9700\u8981\u904d\u5386\u5d4c\u5957\u5b57\u5178\u3002\u8fd9\u79cd\u60c5\u51b5\u901a\u5e38\u9700\u8981\u9012\u5f52\u51fd\u6570\u6765\u904d\u5386\u6240\u6709\u5c42\u7ea7\u7684\u952e\u548c\u503c\u3002<\/p>\n<\/p>\n
nested_dict = {'a': 1, 'b': {'c': 2, 'd': 3}, 'e': 4}<\/p>\n
def traverse_dict(d):<\/p>\n
    for key, value in d.items():<\/p>\n
        if isinstance(value, dict):<\/p>\n
            traverse_dict(value)<\/p>\n
        else:<\/p>\n
            print(f"Key: {key}, Value: {value}")<\/p>\n
traverse_dict(nested_dict)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u6b64\u793a\u4f8b\u4e2d\uff0ctraverse_dict<\/code>\u51fd\u6570\u9012\u5f52\u5730\u904d\u5386\u6240\u6709\u5c42\u7ea7\u7684\u5b57\u5178\uff0c\u5904\u7406\u6bcf\u4e2a\u952e\u548c\u503c\u3002\u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u5904\u7406\u4e0d\u786e\u5b9a\u5c42\u7ea7\u7684\u5d4c\u5957\u5b57\u5178\u3002<\/p>\n<\/p>\n
\u4e03\u3001\u4f7f\u7528enumerate()\u51fd\u6570<\/p>\n<\/p>\n
\u867d\u7136enumerate()<\/code>\u51fd\u6570\u901a\u5e38\u7528\u4e8e\u904d\u5386\u5217\u8868\u548c\u83b7\u53d6\u7d22\u5f15\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u4e5f\u53ef\u4ee5\u5c06\u5176\u4e0e\u5b57\u5178\u7684\u89c6\u56fe\u5bf9\u8c61\u4e00\u8d77\u4f7f\u7528\uff0c\u4ee5\u83b7\u53d6\u7d22\u5f15\u548c\u952e\u503c\u5bf9\u3002<\/p>\n<\/p>\n
my_dict = {'a': 1, 'b': 2, 'c': 3}<\/p>\n
for index, (key, value) in enumerate(my_dict.items()):<\/p>\n
    print(f"Index: {index}, Key: {key}, Value: {value}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u6b64\u65b9\u6cd5\u5728\u9700\u8981\u5bf9\u904d\u5386\u7684\u952e\u503c\u5bf9\u8fdb\u884c\u7d22\u5f15\u65f6\u7279\u522b\u6709\u7528\u3002<\/p>\n<\/p>\n
\u516b\u3001\u603b\u7ed3<\/p>\n<\/p>\n
\u5728Python\u4e2d\uff0c\u6709\u591a\u79cd\u65b9\u5f0f\u53ef\u4ee5\u904d\u5386\u5b57\u5178\uff0c\u6bcf\u79cd\u65b9\u5f0f\u90fd\u6709\u5176\u7279\u5b9a\u7684\u5e94\u7528\u573a\u666f\u3002\u901a\u8fc7\u4e86\u89e3\u548c\u638c\u63e1\u8fd9\u4e9b\u4e0d\u540c\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u9700\u6c42\u9009\u62e9\u6700\u5408\u9002\u7684\u904d\u5386\u65b9\u5f0f\uff0c\u4ece\u800c\u7f16\u5199\u51fa\u66f4\u9ad8\u6548\u548c\u53ef\u8bfb\u6027\u66f4\u5f3a\u7684\u4ee3\u7801\u3002\u5728\u5b9e\u9645\u7f16\u7a0b\u4e2d\uff0c\u9009\u62e9\u5408\u9002\u7684\u5b57\u5178\u904d\u5386\u65b9\u5f0f\u53ef\u4ee5\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u7ef4\u62a4\u6027\u548c\u6548\u7387\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
 \u5982\u4f55\u4f7f\u7528Python\u4e2d\u7684for\u5faa\u73af\u904d\u5386\u5b57\u5178\uff1f<\/strong>
\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7for\u5faa\u73af\u8f7b\u677e\u904d\u5386\u5b57\u5178\u3002\u4f7f\u7528for key in dict:<\/code>\u7684\u5f62\u5f0f\u53ef\u4ee5\u904d\u5386\u5b57\u5178\u7684\u952e\uff0c\u800c\u4f7f\u7528for value in dict.values():<\/code>\u5219\u53ef\u76f4\u63a5\u8bbf\u95ee\u5b57\u5178\u7684\u503c\u3002\u5982\u679c\u9700\u8981\u540c\u65f6\u8bbf\u95ee\u952e\u548c\u503c\uff0c\u53ef\u4ee5\u4f7f\u7528for key, value in dict.items():<\/code>\uff0c\u8fd9\u6837\u53ef\u4ee5\u5728\u4e00\u4e2a\u5faa\u73af\u4e2d\u83b7\u53d6\u5230\u6bcf\u4e2a\u952e\u5bf9\u5e94\u7684\u503c\u3002<\/p>\n
\u662f\u5426\u53ef\u4ee5\u4f7f\u7528\u5217\u8868\u63a8\u5bfc\u5f0f\u904d\u5386\u5b57\u5178\u5e76\u751f\u6210\u65b0\u5217\u8868\uff1f<\/strong>
\u662f\u7684\uff0c\u5217\u8868\u63a8\u5bfc\u5f0f\u662f\u4e00\u79cd\u4f18\u96c5\u7684\u65b9\u5f0f\uff0c\u53ef\u4ee5\u5728\u904d\u5386\u5b57\u5178\u7684\u540c\u65f6\u751f\u6210\u65b0\u5217\u8868\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528[value * 2 for value in my_dict.values()]<\/code>\u6765\u904d\u5386\u5b57\u5178\u7684\u503c\u5e76\u751f\u6210\u4e00\u4e2a\u65b0\u5217\u8868\uff0c\u5176\u4e2d\u5305\u542b\u6bcf\u4e2a\u503c\u4e58\u4ee52\u7684\u7ed3\u679c\u3002\u8fd9\u79cd\u65b9\u5f0f\u7b80\u6d01\u4e14\u9ad8\u6548\uff0c\u9002\u5408\u5bf9\u5b57\u5178\u6570\u636e\u8fdb\u884c\u5feb\u901f\u5904\u7406\u3002<\/p>\n
\u904d\u5386\u5b57\u5178\u65f6\u5982\u4f55\u5904\u7406\u5d4c\u5957\u5b57\u5178\u7684\u60c5\u51b5\uff1f<\/strong>
\u5728\u5904\u7406\u5d4c\u5957\u5b57\u5178\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528\u9012\u5f52\u51fd\u6570\u6765\u904d\u5386\u6240\u6709\u5c42\u7ea7\u7684\u952e\u548c\u503c\u3002\u5b9a\u4e49\u4e00\u4e2a\u51fd\u6570\uff0c\u5728\u51fd\u6570\u5185\u90e8\u5224\u65ad\u5f53\u524d\u9879\u662f\u5426\u4e3a\u5b57\u5178\u7c7b\u578b\u3002\u5982\u679c\u662f\uff0c\u5219\u7ee7\u7eed\u9012\u5f52\u8c03\u7528\u8be5\u51fd\u6570\uff1b\u5982\u679c\u4e0d\u662f\uff0c\u5219\u53ef\u4ee5\u76f4\u63a5\u5904\u7406\u8be5\u9879\u7684\u503c\u3002\u8fd9\u79cd\u65b9\u6cd5\u53ef\u4ee5\u786e\u4fdd\u4f60\u80fd\u591f\u8bbf\u95ee\u5230\u5b57\u5178\u4e2d\u7684\u6240\u6709\u6570\u636e\uff0c\u9002\u5408\u7528\u4e8e\u590d\u6742\u7684\u6570\u636e\u7ed3\u6784\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Python\u4e2d\uff0c\u904d\u5386\u5b57\u5178\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u5f0f\u5b9e\u73b0\uff0c\u5305\u62ec\u4f7f\u7528for\u5faa\u73af\u904d\u5386\u952e\u3001\u503c\u6216\u952e\u503c\u5bf9\uff0c\u5229\u7528\u5b57\u5178\u7684\u5185\u7f6e\u65b9\u6cd5\u5982.i […]","protected":false},"author":3,"featured_media":921374,"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\/921370"}],"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=921370"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/921370\/revisions"}],"predecessor-version":[{"id":921376,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/921370\/revisions\/921376"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/921374"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=921370"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=921370"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=921370"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}