{"id":1187019,"date":"2025-01-15T20:00:01","date_gmt":"2025-01-15T12:00:01","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1187019.html"},"modified":"2025-01-15T20:00:04","modified_gmt":"2025-01-15T12:00:04","slug":"%e5%a6%82%e4%bd%95%e5%88%a4%e6%96%adpython%e6%98%af%e5%90%a6%e6%98%af%e7%a9%ba","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1187019.html","title":{"rendered":"\u5982\u4f55\u5224\u65adpython\u662f\u5426\u662f\u7a7a"},"content":{"rendered":"

\"\u5982\u4f55\u5224\u65adpython\u662f\u5426\u662f\u7a7a\"<\/p>\n

\u5224\u65adPython\u53d8\u91cf\u662f\u5426\u4e3a\u7a7a\u7684\u65b9\u6cd5\u6709\u591a\u79cd\uff1a\u4f7f\u7528\u5e03\u5c14\u4e0a\u4e0b\u6587\u3001\u4f7f\u7528\u6761\u4ef6\u8bed\u53e5\u3001\u4f7f\u7528\u5185\u5efa\u51fd\u6570len()\u3001\u4f7f\u7528\u5185\u5efa\u51fd\u6570isinstance()\u3002<\/strong> \u5176\u4e2d\uff0c\u4f7f\u7528\u5e03\u5c14\u4e0a\u4e0b\u6587<\/strong> \u662f\u6700\u5e38\u7528\u7684\u65b9\u6cd5\uff0c\u56e0\u4e3a\u5b83\u7b80\u5355\u76f4\u89c2\u3002\u5e03\u5c14\u4e0a\u4e0b\u6587\u662f\u6307\u5728\u9700\u8981\u5e03\u5c14\u503c\u7684\u5730\u65b9\u4f7f\u7528\u5bf9\u8c61\u65f6\uff0cPython\u4f1a\u81ea\u52a8\u8c03\u7528\u8be5\u5bf9\u8c61\u7684\u7279\u6b8a\u65b9\u6cd5 bool<\/strong>() \u6216 len<\/strong>() \u5c06\u5176\u8f6c\u6362\u4e3a\u5e03\u5c14\u503c\u3002\u4f8b\u5982\uff0c\u7a7a\u5217\u8868\u3001\u7a7a\u5b57\u7b26\u4e32\u3001\u7a7a\u5b57\u5178\u5728\u5e03\u5c14\u4e0a\u4e0b\u6587\u4e2d\u90fd\u88ab\u8ba4\u4e3a\u662fFalse\uff0c\u800c\u975e\u7a7a\u7684\u5217\u8868\u3001\u5b57\u7b26\u4e32\u3001\u5b57\u5178\u5219\u88ab\u8ba4\u4e3a\u662fTrue\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u5e03\u5c14\u4e0a\u4e0b\u6587<\/h3>\n<\/p>\n

\u5e03\u5c14\u4e0a\u4e0b\u6587\u662f\u5224\u65ad\u4e00\u4e2a\u53d8\u91cf\u662f\u5426\u4e3a\u7a7a\u7684\u6700\u5e38\u7528\u65b9\u6cd5\u3002\u5728Python\u4e2d\uff0c\u4efb\u4f55\u5bf9\u8c61\u5728\u5e03\u5c14\u4e0a\u4e0b\u6587\u4e2d\u90fd\u53ef\u4ee5\u88ab\u81ea\u52a8\u8f6c\u6362\u4e3a\u5e03\u5c14\u503c\u3002\u7a7a\u7684\u5bf9\u8c61\uff08\u5982\u7a7a\u5217\u8868\u3001\u7a7a\u5b57\u5178\u3001\u7a7a\u5b57\u7b26\u4e32\u7b49\uff09\u5728\u5e03\u5c14\u4e0a\u4e0b\u6587\u4e2d\u90fd\u88ab\u8ba4\u4e3a\u662fFalse\uff0c\u800c\u975e\u7a7a\u5bf9\u8c61\u5219\u88ab\u8ba4\u4e3a\u662fTrue\u3002<\/p>\n<\/p>\n

\u4f8b\u5982\uff1a<\/p>\n<\/p>\n

my_list = []<\/p>\n
if not my_list:<\/p>\n
    print("List is empty")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0cmy_list<\/code>\u662f\u4e00\u4e2a\u7a7a\u5217\u8868\uff0c\u5728\u5e03\u5c14\u4e0a\u4e0b\u6587\u4e2d\u88ab\u8ba4\u4e3a\u662fFalse\uff0c\u56e0\u6b64\u6761\u4ef6not my_list<\/code>\u4e3aTrue\uff0c\u6253\u5370\u51fa"List is empty"\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u6761\u4ef6\u8bed\u53e5<\/h3>\n<\/p>\n
\u6761\u4ef6\u8bed\u53e5\u662f\u5224\u65ad\u53d8\u91cf\u662f\u5426\u4e3a\u7a7a\u7684\u53e6\u4e00\u79cd\u5e38\u7528\u65b9\u6cd5\u3002\u901a\u8fc7if<\/code>\u6216while<\/code>\u8bed\u53e5\u6765\u5224\u65ad\u53d8\u91cf\u7684\u771f\u5047\u503c\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n
my_dict = {}<\/p>\n
if my_dict:<\/p>\n
    print("Dictionary is not empty")<\/p>\n
else:<\/p>\n
    print("Dictionary is empty")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0cmy_dict<\/code>\u662f\u4e00\u4e2a\u7a7a\u5b57\u5178\uff0c\u5728\u5e03\u5c14\u4e0a\u4e0b\u6587\u4e2d\u88ab\u8ba4\u4e3a\u662fFalse\uff0c\u56e0\u6b64\u6253\u5370\u51fa"Dictionary is empty"\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528\u5185\u5efa\u51fd\u6570len()<\/h3>\n<\/p>\n
\u5185\u5efa\u51fd\u6570len()<\/code>\u53ef\u4ee5\u7528\u6765\u68c0\u67e5\u5bf9\u8c61\u7684\u957f\u5ea6\uff0c\u5982\u679c\u5bf9\u8c61\u7684\u957f\u5ea6\u4e3a0\uff0c\u5219\u8ba4\u4e3a\u5bf9\u8c61\u4e3a\u7a7a\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n
my_string = ""<\/p>\n
if len(my_string) == 0:<\/p>\n
    print("String is empty")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0cmy_string<\/code>\u662f\u4e00\u4e2a\u7a7a\u5b57\u7b26\u4e32\uff0c\u5b83\u7684\u957f\u5ea6\u4e3a0\uff0c\u56e0\u6b64\u6253\u5370\u51fa"String is empty"\u3002<\/p>\n<\/p>\n
\u56db\u3001\u4f7f\u7528\u5185\u5efa\u51fd\u6570isinstance()<\/h3>\n<\/p>\n
\u5185\u5efa\u51fd\u6570isinstance()<\/code>\u53ef\u4ee5\u7528\u6765\u68c0\u67e5\u5bf9\u8c61\u7684\u7c7b\u578b\uff0c\u5e76\u7ed3\u5408\u5176\u4ed6\u65b9\u6cd5\u5224\u65ad\u5bf9\u8c61\u662f\u5426\u4e3a\u7a7a\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n
my_tuple = ()<\/p>\n
if isinstance(my_tuple, tuple) and len(my_tuple) == 0:<\/p>\n
    print("Tuple is empty")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0cisinstance(my_tuple, tuple)<\/code>\u68c0\u67e5my_tuple<\/code>\u662f\u5426\u4e3a\u5143\u7ec4\u7c7b\u578b\uff0clen(my_tuple) == 0<\/code>\u68c0\u67e5\u5143\u7ec4\u7684\u957f\u5ea6\u662f\u5426\u4e3a0\uff0c\u5982\u679c\u4e24\u4e2a\u6761\u4ef6\u90fd\u6ee1\u8db3\uff0c\u5219\u6253\u5370\u51fa"Tuple is empty"\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u4f7f\u7528PEP 8\u63a8\u8350\u7684\u65b9\u6cd5<\/h3>\n<\/p>\n
PEP 8\u662fPython\u7684\u5b98\u65b9\u7f16\u7801\u89c4\u8303\uff0c\u5b83\u63a8\u8350\u4e86\u4e00\u4e9b\u5224\u65ad\u53d8\u91cf\u662f\u5426\u4e3a\u7a7a\u7684\u6700\u4f73\u5b9e\u8df5\u3002\u4f8b\u5982\uff0c\u5bf9\u4e8e\u7a7a\u5217\u8868\u3001\u7a7a\u5b57\u5178\u3001\u7a7a\u5b57\u7b26\u4e32\u7b49\uff0cPEP 8\u5efa\u8bae\u76f4\u63a5\u4f7f\u7528\u5e03\u5c14\u4e0a\u4e0b\u6587\u5224\u65ad\uff0c\u800c\u4e0d\u662f\u4f7f\u7528len()<\/code>\u51fd\u6570\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n
# PEP 8\u63a8\u8350\u7684\u65b9\u6cd5<\/p>\n
my_list = []<\/p>\n
if not my_list:<\/p>\n
    print("List is empty")<\/p>\n
\u4e0d\u63a8\u8350\u7684\u65b9\u6cd5<\/strong><\/h2>\n
if len(my_list) == 0:<\/p>\n
    print("List is empty")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u76f4\u63a5\u4f7f\u7528if not my_list:<\/code>\u7684\u65b9\u5f0f\u66f4\u4e3a\u7b80\u6d01\uff0c\u7b26\u5408PEP 8\u7684\u63a8\u8350\u3002<\/p>\n<\/p>\n
\u516d\u3001\u603b\u7ed3<\/h3>\n<\/p>\n
\u5224\u65adPython\u53d8\u91cf\u662f\u5426\u4e3a\u7a7a\u7684\u65b9\u6cd5\u6709\u591a\u79cd\uff0c\u5305\u62ec\u4f7f\u7528\u5e03\u5c14\u4e0a\u4e0b\u6587\u3001\u6761\u4ef6\u8bed\u53e5\u3001\u5185\u5efa\u51fd\u6570len()<\/code>\u3001\u5185\u5efa\u51fd\u6570isinstance()<\/code>\u7b49\u3002\u6700\u5e38\u7528\u4e14\u63a8\u8350\u7684\u65b9\u6cd5\u662f\u4f7f\u7528\u5e03\u5c14\u4e0a\u4e0b\u6587\uff0c\u56e0\u4e3a\u5b83\u7b80\u5355\u76f4\u89c2\uff0c\u7b26\u5408PEP 8\u7684\u7f16\u7801\u89c4\u8303\u3002\u5728\u5b9e\u9645\u7f16\u7a0b\u4e2d\uff0c\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u6765\u5224\u65ad\u53d8\u91cf\u662f\u5426\u4e3a\u7a7a\uff0c\u53ef\u4ee5\u4f7f\u4ee3\u7801\u66f4\u52a0\u7b80\u6d01\u3001\u6613\u8bfb\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
 \u5982\u4f55\u68c0\u67e5Python\u4e2d\u7684\u53d8\u91cf\u662f\u5426\u4e3a\u7a7a\uff1f<\/strong>
\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u591a\u79cd\u65b9\u6cd5\u6765\u68c0\u67e5\u53d8\u91cf\u662f\u5426\u4e3a\u7a7a\u3002\u6700\u5e38\u7528\u7684\u65b9\u6cd5\u662f\u4f7f\u7528if not variable:<\/code>\u8bed\u53e5\uff0c\u8fd9\u6837\u53ef\u4ee5\u540c\u65f6\u68c0\u67e5None<\/code>\u3001\u7a7a\u5b57\u7b26\u4e32\u3001\u7a7a\u5217\u8868\u3001\u7a7a\u5b57\u5178\u7b49\u60c5\u51b5\u3002\u53e6\u4e00\u79cd\u65b9\u6cd5\u662f\u4f7f\u7528len()<\/code>\u51fd\u6570\u6765\u68c0\u67e5\u5bf9\u8c61\u7684\u957f\u5ea6\uff0c\u4f8b\u5982if len(variable) == 0:<\/code>\u3002<\/p>\n
Python\u4e2d\u7684\u7a7a\u503c\u4e0eNone\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/strong>
\u5728Python\u4e2d\uff0cNone<\/code>\u662f\u4e00\u4e2a\u7279\u6b8a\u7684\u5e38\u91cf\uff0c\u8868\u793a\u7f3a\u4e4f\u503c\u6216\u7a7a\u503c\u3002\u7a7a\u5b57\u7b26\u4e32\u3001\u7a7a\u5217\u8868\u3001\u7a7a\u5b57\u5178\u7b49\u90fd\u662f\u6709\u6548\u7684\u5bf9\u8c61\uff0c\u4f46\u5b83\u4eec\u7684\u5185\u5bb9\u4e3a\u7a7a\u3002\u4f7f\u7528is None<\/code>\u53ef\u4ee5\u5224\u65ad\u4e00\u4e2a\u53d8\u91cf\u662f\u5426\u4e3aNone<\/code>\uff0c\u800c\u4f7f\u7528if not variable:<\/code>\u53ef\u4ee5\u68c0\u67e5\u662f\u5426\u4e3a\u7a7a\u6216\u4e3aNone<\/code>\u3002<\/p>\n
\u5728Python\u4e2d\u5982\u4f55\u5904\u7406\u7a7a\u503c\u4ee5\u907f\u514d\u9519\u8bef\uff1f<\/strong>
\u5728\u7f16\u5199\u4ee3\u7801\u65f6\uff0c\u5904\u7406\u7a7a\u503c\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u53ef\u4ee5\u4f7f\u7528\u5f02\u5e38\u5904\u7406\u673a\u5236\uff08try-except<\/code>\u8bed\u53e5\uff09\u6765\u6355\u83b7\u6f5c\u5728\u7684\u9519\u8bef\u3002\u5982\u679c\u4e0d\u786e\u5b9a\u53d8\u91cf\u662f\u5426\u4e3a\u7a7a\uff0c\u53ef\u4ee5\u4f7f\u7528\u6761\u4ef6\u8bed\u53e5\u6765\u786e\u4fdd\u4ee3\u7801\u7684\u5065\u58ee\u6027\u3002\u4f8b\u5982\uff0c\u5728\u8bbf\u95ee\u5217\u8868\u6216\u5b57\u5178\u7684\u5143\u7d20\u4e4b\u524d\uff0c\u5148\u68c0\u67e5\u5b83\u4eec\u662f\u5426\u4e3a\u7a7a\uff0c\u4ee5\u907f\u514dIndexError<\/code>\u6216KeyError<\/code>\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5224\u65adPython\u53d8\u91cf\u662f\u5426\u4e3a\u7a7a\u7684\u65b9\u6cd5\u6709\u591a\u79cd\uff1a\u4f7f\u7528\u5e03\u5c14\u4e0a\u4e0b\u6587\u3001\u4f7f\u7528\u6761\u4ef6\u8bed\u53e5\u3001\u4f7f\u7528\u5185\u5efa\u51fd\u6570len()\u3001\u4f7f\u7528\u5185\u5efa\u51fd\u6570i […]","protected":false},"author":3,"featured_media":1187022,"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\/1187019"}],"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=1187019"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1187019\/revisions"}],"predecessor-version":[{"id":1187024,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1187019\/revisions\/1187024"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1187022"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1187019"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1187019"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1187019"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}