{"id":1132652,"date":"2025-01-08T20:59:15","date_gmt":"2025-01-08T12:59:15","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1132652.html"},"modified":"2025-01-08T20:59:18","modified_gmt":"2025-01-08T12:59:18","slug":"python%e4%b8%ad%e5%a6%82%e4%bd%95%e5%88%a0%e9%99%a4%e4%b8%80%e4%b8%aa%e5%ad%97%e5%85%b8","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1132652.html","title":{"rendered":"python\u4e2d\u5982\u4f55\u5220\u9664\u4e00\u4e2a\u5b57\u5178"},"content":{"rendered":"

\"python\u4e2d\u5982\u4f55\u5220\u9664\u4e00\u4e2a\u5b57\u5178\"<\/p>\n

\u5728Python\u4e2d\u5220\u9664\u4e00\u4e2a\u5b57\u5178\u7684\u65b9\u6cd5\u6709\u591a\u79cd\uff0c\u5305\u62ec\u4f7f\u7528del\u8bed\u53e5\u3001clear()\u65b9\u6cd5\u3001pop()\u65b9\u6cd5\u7b49<\/strong>\u3002\u8fd9\u4e9b\u65b9\u6cd5\u5404\u6709\u5176\u9002\u7528\u573a\u666f\u548c\u4f18\u7f3a\u70b9\uff0c\u4e0b\u9762\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u6bcf\u79cd\u65b9\u6cd5\u7684\u4f7f\u7528\u65b9\u5f0f\u53ca\u5176\u6ce8\u610f\u4e8b\u9879\u3002\u5176\u4e2d\uff0cdel<\/code>\u8bed\u53e5\u662f\u6700\u5e38\u7528\u548c\u9ad8\u6548\u7684\u65b9\u5f0f\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528 del<\/code> \u8bed\u53e5\u5220\u9664\u5b57\u5178<\/h3>\n<\/p>\n

\u4f7f\u7528 del<\/code> \u8bed\u53e5\u53ef\u4ee5\u5f7b\u5e95\u5220\u9664\u5b57\u5178\u5bf9\u8c61\u3002\u8fd9\u79cd\u65b9\u6cd5\u4e0d\u4ec5\u4f1a\u5220\u9664\u5b57\u5178\u4e2d\u7684\u6240\u6709\u952e\u503c\u5bf9\uff0c\u8fd8\u4f1a\u4ece\u5185\u5b58\u4e2d\u79fb\u9664\u6574\u4e2a\u5b57\u5178\u5bf9\u8c61\u3002<\/p>\n<\/p>\n

my_dict = {'a': 1, 'b': 2, 'c': 3}<\/p>\n
del my_dict<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e00\u65e6\u6267\u884c\u4e86 del<\/code> \u8bed\u53e5\uff0c\u8bd5\u56fe\u518d\u6b21\u8bbf\u95ee my_dict<\/code> \u5c06\u4f1a\u5f15\u53d1 NameError<\/code>\uff0c\u56e0\u4e3a\u8be5\u5b57\u5178\u5bf9\u8c61\u5df2\u7ecf\u4e0d\u518d\u5b58\u5728\u3002<\/p>\n<\/p>\n
try:<\/p>\n
    print(my_dict)<\/p>\n
except NameError:<\/p>\n
    print("my_dict is not defined.")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528 clear()<\/code> \u65b9\u6cd5\u6e05\u7a7a\u5b57\u5178<\/h3>\n<\/p>\n
\u4f7f\u7528 clear()<\/code> \u65b9\u6cd5\u53ef\u4ee5\u6e05\u7a7a\u5b57\u5178\u4e2d\u7684\u6240\u6709\u952e\u503c\u5bf9\uff0c\u4f46\u4e0d\u4f1a\u5220\u9664\u5b57\u5178\u5bf9\u8c61\u672c\u8eab\u3002\u8fd9\u5728\u9700\u8981\u4fdd\u7559\u5b57\u5178\u5bf9\u8c61\u4f46\u91cd\u7f6e\u5176\u5185\u5bb9\u65f6\u975e\u5e38\u6709\u7528\u3002<\/p>\n<\/p>\n
my_dict = {'a': 1, 'b': 2, 'c': 3}<\/p>\n
my_dict.clear()<\/p>\n
print(my_dict)  # \u8f93\u51fa: {}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528 pop()<\/code> \u65b9\u6cd5\u5220\u9664\u7279\u5b9a\u952e\u503c\u5bf9<\/h3>\n<\/p>\n
pop()<\/code> \u65b9\u6cd5\u53ef\u4ee5\u5220\u9664\u5b57\u5178\u4e2d\u7684\u7279\u5b9a\u952e\u503c\u5bf9\uff0c\u5e76\u8fd4\u56de\u88ab\u5220\u9664\u7684\u503c\u3002\u5982\u679c\u952e\u4e0d\u5b58\u5728\uff0c\u4f1a\u5f15\u53d1 KeyError<\/code>\uff0c\u9664\u975e\u63d0\u4f9b\u4e86\u9ed8\u8ba4\u503c\u3002<\/p>\n<\/p>\n
my_dict = {'a': 1, 'b': 2, 'c': 3}<\/p>\n
value = my_dict.pop('b')<\/p>\n
print(my_dict)  # \u8f93\u51fa: {'a': 1, 'c': 3}<\/p>\n
print(value)  # \u8f93\u51fa: 2<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u53ef\u4ee5\u63d0\u4f9b\u4e00\u4e2a\u9ed8\u8ba4\u503c\uff0c\u4ee5\u9632\u952e\u4e0d\u5b58\u5728\u65f6\u907f\u514d\u62a5\u9519\uff1a<\/p>\n<\/p>\n
value = my_dict.pop('d', 'Key not found')<\/p>\n
print(value)  # \u8f93\u51fa: Key not found<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u56db\u3001\u4f7f\u7528 popitem()<\/code> \u65b9\u6cd5\u5220\u9664\u6700\u540e\u4e00\u4e2a\u952e\u503c\u5bf9<\/h3>\n<\/p>\n
popitem()<\/code> \u65b9\u6cd5\u5220\u9664\u5e76\u8fd4\u56de\u5b57\u5178\u4e2d\u7684\u6700\u540e\u4e00\u4e2a\u952e\u503c\u5bf9\u3002\u6b64\u65b9\u6cd5\u5728Python 3.7\u53ca\u66f4\u9ad8\u7248\u672c\u4e2d\u4fdd\u8bc1\u4e86\u5b57\u5178\u7684\u63d2\u5165\u987a\u5e8f\u3002<\/p>\n<\/p>\n
my_dict = {'a': 1, 'b': 2, 'c': 3}<\/p>\n
key, value = my_dict.popitem()<\/p>\n
print(my_dict)  # \u8f93\u51fa: {'a': 1, 'b': 2}<\/p>\n
print(key, value)  # \u8f93\u51fa: c 3<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e94\u3001\u4f7f\u7528\u5b57\u5178\u63a8\u5bfc\u5f0f\u5220\u9664\u7279\u5b9a\u6761\u4ef6\u7684\u952e\u503c\u5bf9<\/h3>\n<\/p>\n
\u5b57\u5178\u63a8\u5bfc\u5f0f\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5b57\u5178\uff0c\u6392\u9664\u7b26\u5408\u7279\u5b9a\u6761\u4ef6\u7684\u952e\u503c\u5bf9\u3002\u8fd9\u79cd\u65b9\u6cd5\u4e0d\u4f1a\u4fee\u6539\u539f\u59cb\u5b57\u5178\uff0c\u800c\u662f\u751f\u6210\u4e00\u4e2a\u65b0\u7684\u5b57\u5178\u3002<\/p>\n<\/p>\n
my_dict = {'a': 1, 'b': 2, 'c': 3, 'd': 4}<\/p>\n
new_dict = {k: v for k, v in my_dict.items() if v % 2 == 0}<\/p>\n
print(new_dict)  # \u8f93\u51fa: {'b': 2, 'd': 4}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u516d\u3001\u4f7f\u7528 del<\/code> \u8bed\u53e5\u5220\u9664\u7279\u5b9a\u952e\u503c\u5bf9<\/h3>\n<\/p>\n
\u9664\u4e86\u5220\u9664\u6574\u4e2a\u5b57\u5178\uff0cdel<\/code> \u8bed\u53e5\u4e5f\u53ef\u4ee5\u7528\u6765\u5220\u9664\u7279\u5b9a\u7684\u952e\u503c\u5bf9\u3002\u5982\u679c\u952e\u4e0d\u5b58\u5728\uff0c\u4f1a\u5f15\u53d1 KeyError<\/code>\u3002<\/p>\n<\/p>\n
my_dict = {'a': 1, 'b': 2, 'c': 3}<\/p>\n
del my_dict['b']<\/p>\n
print(my_dict)  # \u8f93\u51fa: {'a': 1, 'c': 3}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e03\u3001\u4f7f\u7528 dict.pop()<\/code> \u65b9\u6cd5\u7684\u5176\u4ed6\u7528\u6cd5<\/h3>\n<\/p>\n
\u9664\u4e86\u5220\u9664\u7279\u5b9a\u952e\u503c\u5bf9\uff0cdict.pop()<\/code> \u8fd8\u53ef\u4ee5\u7528\u4e8e\u5904\u7406\u9ed8\u8ba4\u503c\u3002\u5982\u4e0b\u6240\u793a\uff0c\u5982\u679c\u952e\u4e0d\u5b58\u5728\uff0c\u8fd4\u56de\u9ed8\u8ba4\u503c\u800c\u4e0d\u662f\u5f15\u53d1\u9519\u8bef\u3002<\/p>\n<\/p>\n
my_dict = {'a': 1, 'b': 2, 'c': 3}<\/p>\n
value = my_dict.pop('d', None)<\/p>\n
print(value)  # \u8f93\u51fa: None<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u516b\u3001\u4f7f\u7528 popitem()<\/code> \u65b9\u6cd5\u5220\u9664\u548c\u8fd4\u56de\u952e\u503c\u5bf9<\/h3>\n<\/p>\n
popitem()<\/code> \u65b9\u6cd5\u9002\u7528\u4e8e\u9700\u8981\u9010\u4e2a\u5220\u9664\u952e\u503c\u5bf9\u7684\u60c5\u51b5\uff0c\u540c\u65f6\u83b7\u53d6\u88ab\u5220\u9664\u7684\u952e\u503c\u5bf9\u3002<\/p>\n<\/p>\n
my_dict = {'a': 1, 'b': 2, 'c': 3}<\/p>\n
while my_dict:<\/p>\n
    key, value = my_dict.popitem()<\/p>\n
    print(f"Removed ({key}, {value})")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e5d\u3001\u5220\u9664\u5b57\u5178\u4e2d\u7279\u5b9a\u6761\u4ef6\u7684\u952e\u503c\u5bf9<\/h3>\n<\/p>\n
\u6709\u65f6\u9700\u8981\u5220\u9664\u6ee1\u8db3\u7279\u5b9a\u6761\u4ef6\u7684\u952e\u503c\u5bf9\uff0c\u53ef\u4ee5\u4f7f\u7528\u5faa\u73af\u548c del<\/code> \u8bed\u53e5\u6765\u5b9e\u73b0\u3002<\/p>\n<\/p>\n
my_dict = {'a': 1, 'b': 2, 'c': 3, 'd': 4}<\/p>\n
keys_to_remove = [k for k, v in my_dict.items() if v % 2 == 0]<\/p>\n
for k in keys_to_remove:<\/p>\n
    del my_dict[k]<\/p>\n
print(my_dict)  # \u8f93\u51fa: {'a': 1, 'c': 3}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5341\u3001\u603b\u7ed3<\/h3>\n<\/p>\n
\u5728Python\u4e2d\u5220\u9664\u4e00\u4e2a\u5b57\u5178\u6216\u5176\u952e\u503c\u5bf9\u7684\u65b9\u6cd5\u591a\u79cd\u591a\u6837\uff0c\u5305\u62ecdel<\/code> \u8bed\u53e5\u3001clear()<\/code> \u65b9\u6cd5\u3001pop()<\/code> \u65b9\u6cd5\u3001popitem()<\/code> \u65b9\u6cd5\u3001\u5b57\u5178\u63a8\u5bfc\u5f0f<\/strong>\u7b49\u3002\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u53d6\u51b3\u4e8e\u5177\u4f53\u7684\u9700\u6c42\u548c\u4f7f\u7528\u573a\u666f\u3002del<\/code> \u8bed\u53e5\u7528\u4e8e\u5f7b\u5e95\u5220\u9664\u5b57\u5178\u5bf9\u8c61\uff0cclear()<\/code> \u65b9\u6cd5\u9002\u7528\u4e8e\u6e05\u7a7a\u5b57\u5178\u4f46\u4fdd\u7559\u5bf9\u8c61\uff0cpop()<\/code> \u548c popitem()<\/code> \u65b9\u6cd5\u7528\u4e8e\u5220\u9664\u7279\u5b9a\u6216\u6700\u540e\u4e00\u4e2a\u952e\u503c\u5bf9<\/strong>\u3002\u4e86\u89e3\u8fd9\u4e9b\u65b9\u6cd5\u7684\u4f18\u7f3a\u70b9\u548c\u9002\u7528\u573a\u666f\uff0c\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u66f4\u9ad8\u6548\u5730\u7ba1\u7406\u548c\u64cd\u4f5c\u5b57\u5178\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
 \u5728Python\u4e2d\uff0c\u5220\u9664\u5b57\u5178\u4e2d\u7684\u7279\u5b9a\u952e\u503c\u5bf9\u6709\u4ec0\u4e48\u65b9\u6cd5\uff1f<\/strong>
\u53ef\u4ee5\u4f7f\u7528del<\/code>\u8bed\u53e5\u6216pop()<\/code>\u65b9\u6cd5\u6765\u5220\u9664\u5b57\u5178\u4e2d\u7684\u7279\u5b9a\u952e\u503c\u5bf9\u3002\u4f7f\u7528del dict[key]<\/code>\u53ef\u4ee5\u76f4\u63a5\u5220\u9664\u952e\uff0c\u800c\u4f7f\u7528dict.pop(key)<\/code>\u5219\u4f1a\u8fd4\u56de\u88ab\u5220\u9664\u7684\u503c\u3002\u5982\u679c\u952e\u4e0d\u5b58\u5728\uff0cpop()<\/code>\u65b9\u6cd5\u8fd8\u53ef\u4ee5\u63d0\u4f9b\u4e00\u4e2a\u9ed8\u8ba4\u503c\u4ee5\u907f\u514d\u5f15\u53d1\u9519\u8bef\u3002<\/p>\n
\u5982\u679c\u6211\u60f3\u6e05\u7a7a\u6574\u4e2a\u5b57\u5178\uff0c\u5e94\u8be5\u600e\u4e48\u505a\uff1f<\/strong>
\u8981\u6e05\u7a7a\u6574\u4e2a\u5b57\u5178\uff0c\u53ef\u4ee5\u4f7f\u7528dict.clear()<\/code>\u65b9\u6cd5\u3002\u8fd9\u5c06\u79fb\u9664\u5b57\u5178\u4e2d\u7684\u6240\u6709\u952e\u503c\u5bf9\uff0c\u4f46\u4fdd\u7559\u5b57\u5178\u5bf9\u8c61\u672c\u8eab\u3002\u5982\u679c\u4f60\u5e0c\u671b\u5220\u9664\u5b57\u5178\u5e76\u91ca\u653e\u5185\u5b58\uff0c\u53ef\u4ee5\u4f7f\u7528del dict<\/code>\u6765\u5220\u9664\u5b57\u5178\u5bf9\u8c61\u3002<\/p>\n
\u5220\u9664\u5b57\u5178\u540e\uff0c\u5982\u4f55\u786e\u8ba4\u5b57\u5178\u662f\u5426\u5df2\u6210\u529f\u5220\u9664\uff1f<\/strong>
\u5728\u5220\u9664\u5b57\u5178\u540e\uff0c\u53ef\u4ee5\u5c1d\u8bd5\u8bbf\u95ee\u8be5\u5b57\u5178\u3002\u5982\u679c\u5b57\u5178\u5df2\u88ab\u5220\u9664\uff0c\u5c06\u5f15\u53d1NameError<\/code>\u3002\u5982\u679c\u53ea\u662f\u6e05\u7a7a\u5b57\u5178\uff0c\u4f7f\u7528len(dict)<\/code>\u51fd\u6570\u53ef\u4ee5\u68c0\u67e5\u5b57\u5178\u7684\u957f\u5ea6\uff0c\u8fd4\u56de\u503c\u5e94\u4e3a0\uff0c\u8868\u793a\u5b57\u5178\u5df2\u88ab\u6210\u529f\u6e05\u7a7a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Python\u4e2d\u5220\u9664\u4e00\u4e2a\u5b57\u5178\u7684\u65b9\u6cd5\u6709\u591a\u79cd\uff0c\u5305\u62ec\u4f7f\u7528del\u8bed\u53e5\u3001clear()\u65b9\u6cd5\u3001pop()\u65b9\u6cd5\u7b49\u3002\u8fd9\u4e9b\u65b9\u6cd5\u5404 […]","protected":false},"author":3,"featured_media":1132659,"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\/1132652"}],"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=1132652"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1132652\/revisions"}],"predecessor-version":[{"id":1132660,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1132652\/revisions\/1132660"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1132659"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1132652"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1132652"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1132652"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}