{"id":592,"date":"2019-05-16T18:40:59","date_gmt":"2019-05-16T10:40:59","guid":{"rendered":"https:\/\/www.sunjw.cn\/?p=592"},"modified":"2019-05-16T14:03:17","modified_gmt":"2019-05-16T06:03:17","slug":"python_key_argument","status":"publish","type":"post","link":"https:\/\/www.sunjw.cn\/index.php\/2019\/05\/16\/python_key_argument\/","title":{"rendered":"[PYTHON]python\u4e2d\u7684\u5173\u952e\u5b57\u53c2\u6570"},"content":{"rendered":"

\u5728\u90e8\u5206\u51fd\u6570\u4e2d\uff0c\u6211\u4eec\u4f1a\u770b\u5230\u4f20\u5165\u7684\u53c2\u6570\u5e26\u6709\u5173\u952e\u5b57\uff0c\u8fd9\u7c7b\u53c2\u6570\u79f0\u4e3a\u5173\u952e\u5b57\u53c2\u6570\uff08keyword arguments\uff09\u3002
\n\u6bd4\u5982\uff1a
\nheaders={….}
\nr=requests.get(URL,headers=headers)
\n\u8fd9\u79cd\u4f20\u5165\u53c2\u6570\u7684\u65b9\u6cd5\u770b\u8d77\u6765\u66f4\u7b80\u6d01\u6e05\u6670\u3002
\n\u5728python\u51fd\u6570\u5b9a\u4e49\u7684\u65f6\u5019\uff0c\u53ef\u4ee5\u4f7f\u7528*\u5728\u5f3a\u5236\u4f7f\u7528\u5173\u952e\u5b57\u53c2\u6570\u3002\u5982\u4e0b\u793a\u4f8b\uff1a
\ndef addd(a, *,b,c):<\/em><\/strong>
\n\u00a0 \u00a0 print(a,b,c)<\/em><\/strong>
\n#addd(1,2,3)#error<\/em><\/strong><\/span>
\n#addd(1,b=2,3)#error<\/em><\/strong><\/span>
\naddd(1,b=2,c=3)<\/em><\/strong><\/p>\n

def adda(*,a,b,c):<\/em><\/strong>
\n\u00a0 \u00a0 print(a,b,c)<\/em><\/strong>
\n#adda(a=1,2,3)#error<\/em><\/strong><\/span>
\n#adda(a=1,2,3)#error<\/em><\/strong><\/span>
\nadda(a=1,b=23,c=2)<\/em><\/strong>
\n\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u6240\u6709\u5728*\u4e4b\u540e\u7684\u53c2\u6570\u90fd\u4f1a\u88ab\u89c6\u4e3a\u5173\u952e\u5b57\u53c2\u6570\u3002<\/p>\n

\u5982\u679c\u51fd\u6570\u53c2\u6570\u4e2d\u6709\u53ef\u53d8\u53c2\u6570\uff0c\u5219\u53ef\u53d8\u53c2\u6570(\u53d8\u91cf\u540d\u524d\u7d27\u8ddf*)\u4e4b\u540e\u7684\u6240\u6709\u53c2\u6570\u90fd\u88ab\u89c6\u4e3a\u5173\u952e\u5b57\u53c2\u6570\u3002\u53ef\u53d8\u53c2\u6570\u672c\u8eab\u4e0d\u662f\u5173\u952e\u5b57\u53c2\u6570\u3002\u5982\u4e0b*arg\uff1a<\/p>\n

def addb(a, *arg,b,c):<\/em><\/strong>
\n\u00a0 \u00a0 print(a, arg,b,c)<\/em><\/strong>
\n#addb(10,(1,2),20,30)#error<\/em><\/strong><\/span>
\naddb(10,(1,2),b=20,c=30)<\/em><\/strong>
\naddb(10,2,b=20,c=30)<\/em><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

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