{"id":208737,"date":"2020-11-21T23:57:59","date_gmt":"2020-11-21T15:57:59","guid":{"rendered":"http:\/\/4563.org\/?p=208737"},"modified":"2020-11-21T23:57:59","modified_gmt":"2020-11-21T15:57:59","slug":"python-%e6%95%b0%e6%8d%ae%e7%b1%bb%e5%9e%8b%e4%b9%8b%e5%ad%97%e5%85%b8-dict","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=208737","title":{"rendered":"Python \u6570\u636e\u7c7b\u578b\u4e4b\u5b57\u5178 dict"},"content":{"rendered":"
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Python \u6570\u636e\u7c7b\u578b\u4e4b\u5b57\u5178 dict <\/h1>\n

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\u8cc7\u6df1\u5927\u4f6c : fanqieipnet <\/span> <\/i> 3<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
\u4eca\u5929\u756a\u8304\u52a0\u901f\u5c31\u6765\u8bf4\u8bf4 Python \u6570\u636e\u7c7b\u578b\u4e4b\u5b57\u5178 dict<\/p>\n

\u3000\u3000# \u5b57\u5178\u662f\u4e00\u79cd\u53ef\u53d8\u5bb9\u5668\u7c7b\u578b\uff0c\u53ef\u5b58\u50a8\u4efb\u610f\u7c7b\u578b\u5bf9\u8c61<\/p>\n

\u3000\u3000# \u5b57\u5178\u4ee5\u952e\u503c\u5bf9\u5b58\u50a8\u6570\u636e\uff0ckey-value \u5f62\u5f0f\uff0c\u952e\u503c\u4e4b\u95f4\u4f7f\u7528\u5192\u53f7:\u5206\u9694\uff0c\u6bcf\u4e2a\u952e\u503c\u4e2d\u95f4\u7528\u9017\u53f7,\u5206\u9694<\/p>\n

\u3000\u3000# \u5b57\u5178\u5305\u542b\u5728\u5927\u62ec\u53f7\uff0c\u82b1\u62ec\u53f7{}\u4e2d<\/p>\n

\u3000\u3000# python \u4e2d\u952e\u5fc5\u987b\u662f\u4e0d\u53ef\u53d8\u7684\uff0c\u4f46\u503c\u53ef\u53d6\u4efb\u4f55\u6570\u636e\u7c7b\u578b<\/p>\n

\u3000\u3000# \u5143\u7ec4\u53ef\u4ee5\u4f5c\u4e3a dict \u7684 key\uff0c\u4f46\u5217\u8868\u4e0d\u80fd\u4f5c\u4e3a\u5143\u7ec4\u7684 key\uff0cdict \u8981\u6c42 key \u5fc5\u987b\u662f\u4e0d\u53ef\u53d8\u7c7b\u578b\uff0c\u4f46\u5217\u8868\u662f\u53ef\u53d8\u7c7b\u578b<\/p>\n

\u3000\u3000 dic = {“key1″:”value1″,”key2″:”value2”}<\/p>\n

\u3000\u3000 print(dic)<\/p>\n

\u3000\u3000 print(type(dic))<\/p>\n

\u3000\u3000# \u521b\u5efa\u5b57\u5178<\/p>\n

\u3000\u3000# \u521b\u5efa\u4e00\u4e2a\u7a7a\u7684\u5b57\u5178<\/p>\n

\u3000\u3000 b = {}<\/p>\n

\u3000\u3000 print(b)<\/p>\n

\u3000\u3000 print(type(b))<\/p>\n

\u3000\u3000# \u76f4\u63a5\u8d4b\u503c\u521b\u5efa<\/p>\n

\u3000\u3000 a = {“name”:”Tom”,”age”:19,”area”:”shanghai”,123:456}<\/p>\n

\u3000\u3000 print(a)<\/p>\n

\u3000\u3000 print(type(a))<\/p>\n

\u3000\u3000# \u901a\u8fc7\u5173\u952e\u5b57 dict \u548c\u5173\u952e\u5b57\u53c2\u6570\u521b\u5efa<\/p>\n

\u3000\u3000 c = dict(aa=”bb”,bb=”\u4f60\u597d”,cc=”acc”)<\/p>\n

\u3000\u3000 print(c)<\/p>\n

\u3000\u3000# \u901a\u8fc7\u5173\u952e\u5b57 dict \u548c\u4e8c\u5143\u7ec4\u5217\u8868\u521b\u5efa<\/p>\n

\u3000\u3000 list = [(‘name’,”Tom”),(‘age’,20),(‘area’, “shanghai”)]<\/p>\n

\u3000\u3000 d = dict(list)<\/p>\n

\u3000\u3000 print(d)<\/p>\n

\u3000\u3000# \u901a\u8fc7\u5b57\u5178\u63a8\u5bfc\u5f0f\u521b\u5efa<\/p>\n

\u3000\u3000 f = {i:2+i for i in range(1,5)}<\/p>\n

\u3000\u3000 print(f)<\/p>\n

\u3000\u3000# \u901a\u8fc7\u5173\u952e\u5b57 dict \u548c zip \u7ed3\u5408\u521b\u5efa<\/p>\n

\u3000\u3000 e = dict(zip(‘ab’, [1, 2]))<\/p>\n

\u3000\u3000 print(e)<\/p>\n

\u3000\u3000# \u901a\u8fc7 dict.fromkeys()\u521b\u5efa<\/p>\n

\u3000\u3000# \u8fd9\u4e2a\u901a\u5e38\u7528\u6765\u521d\u59cb\u5316\u5b57\u5178, \u8bbe\u7f6e value \u7684\u9ed8\u8ba4\u503c<\/p>\n

\u3000\u3000 g = dict.fromkeys(range(5), ‘v’)<\/p>\n

\u3000\u3000 print(g)<\/p>\n

\u3000\u3000# \u5b57\u5178\u4e2d\u952e\u4e00\u822c\u662f\u552f\u4e00\u7684\uff0c\u5982\u679c\u91cd\u590d\u6700\u540e\u7684\u4e00\u4e2a\u952e\u503c\u5bf9\u4f1a\u66ff\u6362\u524d\u9762\u7684\uff0c\u503c\u4e0d\u9700\u8981\u552f\u4e00<\/p>\n

\u3000\u3000 abc = {“ab”:”11″,”ac”:”22″,”ad”:”33″,”ab”:”55″}<\/p>\n

\u3000\u3000 print(abc)<\/p>\n

\u3000\u3000 print(type(abc))<\/p>\n

\u3000\u3000# \u5b57\u5178\u7684\u8bbf\u95ee<\/p>\n

\u3000\u3000# \u8bbf\u95ee\u5b57\u5178\u4e2d\u7684\u6570\u636e:\u5b57\u5178\u662f\u952e\u503c\u5bf9,\u8bbf\u95ee\u7684\u65f6\u5019\u6839\u636e key \u8fdb\u884c\u8bbf\u95ee\u64cd\u4f5c<\/p>\n

\u3000\u3000# a[key]<\/p>\n

\u3000\u3000# a.get(key)<\/p>\n

\u3000\u3000# \u4f7f\u7528\u65b9\u62ec\u53f7\u8bbf\u95ee\u5b57\u5178,key \u5fc5\u987b\u662f\u5b58\u5728,\u5982\u679c\u4e0d\u5b58\u5728,\u7a0b\u5e8f\u4f1a\u62a5\u5f02\u5e38<\/p>\n

\u3000\u3000 print(a[“name”])<\/p>\n

\u3000\u3000# \u4f7f\u7528 get \u8bbf\u95ee,key \u4e0d\u5b58\u5728,\u4f1a\u8fd4\u56de None,\u7a7a\u7684\u610f\u601d<\/p>\n

\u3000\u3000 print(a.get(“age”))<\/p>\n

\u3000\u3000 print(a.get(“abcd”))<\/p>\n

\u3000\u3000# \u5b57\u5178\u7684\u5e38\u7528\u64cd\u4f5c<\/p>\n

\u3000\u3000# \u5b57\u5178\u6570\u636e\u4fee\u6539<\/p>\n

\u3000\u3000# \u5b57\u5178\u6570\u636e\u5220\u9664<\/p>\n

\u3000\u3000# \u5b57\u5178\u6570\u636e\u589e\u52a0<\/p>\n

\u3000\u3000# \u5b57\u5178\u952e\u7684\u7279\u6027:\u4e0d\u53ef\u91cd\u590d,\u4e0d\u53ef\u53d8<\/p>\n

\u3000\u3000# \u6dfb\u52a0\u4e00\u4e2a\u5b57\u5178:\u4fee\u6539 ,<\/p>\n

\u3000\u3000# \u5982\u679c key \u4e0d\u5b58\u5728,\u8fd9\u5c31\u662f\u4e00\u4e2a\u6dfb\u52a0\u64cd\u4f5c,\u5982\u679c key \u5b58\u5728,\u8fd9\u5c31\u662f\u4e00\u4e2a\u4fee\u6539\u64cd\u4f5c<\/p>\n

\u3000\u3000 a[“msg”] = “\u4f60\u597d”<\/p>\n

\u3000\u3000 print(a)<\/p>\n

\u3000\u3000 a[“age”] = 29<\/p>\n

\u3000\u3000 print(a)<\/p>\n

\u3000\u3000# \u5220\u9664<\/p>\n

\u3000\u3000 del a[“age”]<\/p>\n

\u3000\u3000 print(a)<\/p>\n

\u3000\u3000# \u5217\u8868,\u4e0d\u53ef\u63d2\u5165\u5b57\u5178,\u53ef\u53d8<\/p>\n

\u3000\u3000# a1 = [1,2,3]<\/p>\n

\u3000\u3000# a[a1] = “abc”<\/p>\n

\u3000\u3000# print(a)<\/p>\n

\u3000\u3000# \u5143\u7ec4<\/p>\n

\u3000\u3000 a2 = (1,2,3)<\/p>\n

\u3000\u3000 a[a2] = “abc”<\/p>\n

\u3000\u3000 print(a)<\/p>\n

\u3000\u3000# \u5982\u679c\u8981\u5224\u65ad\u5b57\u5178\u662f\u5426\u5305\u542b\u6307\u5b9a\u7684 key\uff0c\u5219\u53ef\u4ee5\u4f7f\u7528 in \u6216 not in \u8fd0\u7b97\u7b26\u3002\u5b57\u5178\u4e2d in \u6216 not in \u8fd0\u7b97\u7b26\u90fd\u662f\u57fa\u4e8e key \u6765\u5224\u65ad\u7684\uff0c\u5b57\u5178\u7684 key \u5c31\u76f8\u5f53\u4e8e\u5b83\u7684\u7d22\u5f15<\/p>\n

\u3000\u3000# \u5224\u65ad\u5b57\u5178 a \u4e2d\u662f\u5426\u5305\u542b\u540d\u4e3a’age’\u7684 key<\/p>\n

\u3000\u3000 print(“age” in a)<\/p>\n

\u3000\u3000# \u8f93\u51fa True\uff0cFalse<\/p>\n

\u3000\u3000# \u5224\u65ad a \u4e2d\u662f\u5426\u5305\u542b\u540d\u4e3a’school’\u7684 key<\/p>\n

\u3000\u3000 print(‘school’ in a)<\/p>\n

\u3000\u3000# \u5224\u65ad’school’ key \u4e0d\u518d\u5b57\u5178 a \u4e2d<\/p>\n

\u3000\u3000 print(‘school’ not in a)<\/p>\n

\u3000\u3000# \u5217\u8868\u7684\u7d22\u5f15\u603b\u662f\u4ece 0 \u5f00\u59cb\u3001\u8fde\u7eed\u589e\u5927\u7684;\u4f46\u5b57\u5178\u7684\u7d22\u5f15\u5373\u4f7f\u662f\u6574\u6570\u7c7b\u578b\uff0c\u4e5f\u4e0d\u9700\u8981\u4ece 0 \u5f00\u59cb\uff0c\u800c\u4e14\u4e0d\u9700\u8981\u8fde\u7eed\u3002\u56e0\u6b64\uff0c\u5217\u8868\u4e0d\u5141\u8bb8\u5bf9\u4e0d\u5b58\u5728\u7684\u7d22\u5f15\u8d4b\u503c\uff0c\u4f46\u5b57\u5178\u5219\u5141\u8bb8\u76f4\u63a5\u5bf9\u4e0d\u5b58\u5728\u7684 key \u8d4b\u503c\uff0c\u8fd9\u6837\u5c31\u4f1a\u4e3a\u5b57\u5178\u589e\u52a0\u4e00\u4e2a key-value \u5bf9<\/p>\n

\u3000\u3000# \u5b57\u5178\u7684\u5e38\u7528\u65b9\u6cd5<\/p>\n

\u3000\u3000# keys \u83b7\u53d6\u6240\u6709\u7684 key<\/p>\n

\u3000\u3000# values \u83b7\u53d6\u6240\u6709\u7684\u503c<\/p>\n

\u3000\u3000# pop \u6839\u636e\u952e\u5f39\u51fa<\/p>\n

\u3000\u3000# popitem \u5f39\u51fa\u6700\u540e\u4e00\u7ec4\u952e\u503c\u5bf9<\/p>\n

\u3000\u3000# update \u66f4\u65b0\u6570\u636e<\/p>\n

\u3000\u3000# clear \u6e05\u9664\u6570\u636e<\/p>\n

\u3000\u3000 print(a.keys())<\/p>\n

\u3000\u3000 print(a.values())<\/p>\n

\u3000\u3000# \u83b7\u53d6\u6240\u6709\u7684\u952e\u503c\u5bf9<\/p>\n

\u3000\u3000 print(a.items())<\/p>\n

\u3000\u3000# pop \u5f39\u51fa\u7684\u662f\u5b57\u5178\u4e2d\u5b58\u5728\u7684 key<\/p>\n

\u3000\u3000 print(a.pop(“name”))<\/p>\n

\u3000\u3000# popitem() \u65b9\u6cd5\u7528\u4e8e\u968f\u673a\u5f39\u51fa\u5b57\u5178\u4e2d\u7684\u4e00\u4e2a key-value \u5bf9\uff0c\u4f46\u5176\u5b9e\u662f\u5f39\u51fa\u6700\u540e\u4e00\u4e2a\u952e\u503c\u5bf9<\/p>\n

\u3000\u3000 print(a.popitem())<\/p>\n

\u3000\u3000 print(a)<\/p>\n

\u3000\u3000# \u66f4\u65b0\u4e00\u4e2a\u952e\u503c\u5bf9<\/p>\n

\u3000\u3000 a.update(msg=”\u4e16\u754c”)<\/p>\n

\u3000\u3000 print(a)<\/p>\n

\u3000\u3000# \u6e05\u7a7a\u5b57\u5178<\/p>\n

\u3000\u3000 print(a.clear())<\/p>\n

\u3000\u3000# setdefault()\u65b9\u6cd5:\u6839\u636e key \u6765\u83b7\u53d6\u5bf9\u5e94 value \u7684\u503c;<\/p>\n

\u3000\u3000# setdefault() \u65b9\u6cd5\u603b\u80fd\u8fd4\u56de\u6307\u5b9a key \u5bf9\u5e94\u7684 value;\u5982\u679c\u8be5 key-value \u5bf9\u5b58\u5728\uff0c\u5219\u76f4\u63a5\u8fd4\u56de\u8be5 key \u5bf9\u5e94\u7684 value;\u5982\u679c\u8be5 key-value \u5bf9\u4e0d\u5b58\u5728\uff0c\u5219\u5148\u4e3a\u8be5 key \u8bbe\u7f6e\u9ed8\u8ba4\u7684 value\uff0c\u7136\u540e\u518d\u8fd4\u56de\u8be5 key \u5bf9\u5e94\u7684 value \u3002<\/p>\n

\u3000\u3000# \u8bbe\u7f6e\u9ed8\u8ba4\u503c\uff0c\u8be5 key \u5728 dict \u4e2d\u4e0d\u5b58\u5728\uff0c\u65b0\u589e key-value \u5bf9<\/p>\n

\u3000\u3000 a = {“name”:”Tom”,”age”:19,”area”:”shanghai”,123:456}<\/p>\n

\u3000\u3000 print(a.setdefault(‘school’, “\u5927\u5b66”)) # 9.2<\/p>\n

\u3000\u3000 print(a)<\/p>\n

\u3000\u3000# \u8bbe\u7f6e\u9ed8\u8ba4\u503c\uff0c\u8be5 key \u5728 dict \u4e2d\u5b58\u5728\uff0c\u4e0d\u4f1a\u4fee\u6539 dict \u5185\u5bb9<\/p>\n

\u3000\u3000 print(a.setdefault(‘name’, “Lida”)) # 8.5<\/p>\n

\u3000\u3000 print(a) <\/p><\/div>\n

\u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (0<\/span>) <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n
    \n
  • \n","protected":false},"excerpt":{"rendered":"

    Python \u6570\u636e\u7c7b\u578b\u4e4b\u5b57\u5178 di…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/208737"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=208737"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/208737\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=208737"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=208737"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=208737"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}