{"id":1689,"date":"2020-06-22T16:44:33","date_gmt":"2020-06-22T08:44:33","guid":{"rendered":"http:\/\/39.97.231.10\/?p=1689"},"modified":"2020-06-22T16:44:33","modified_gmt":"2020-06-22T08:44:33","slug":"%e5%bf%ab%e9%80%9f%e4%b8%ba-python-%e5%ad%97%e5%85%b8%e8%ae%be%e7%bd%ae%e6%96%b0%e7%9a%84%e5%80%bc","status":"publish","type":"post","link":"http:\/\/www.weijing.co\/?p=1689","title":{"rendered":"\u5feb\u901f\u4e3a Python \u5b57\u5178\u8bbe\u7f6e\u65b0\u7684\u503c"},"content":{"rendered":"
\u5047\u8bbe\u6709\u8fd9\u6837\u4e00\u4e2a\u5b57\u5178\u5bf9\u8c61\uff1a<\/div>\n
\n
\n
dict = {\\'evaporation\\': {\\'\u91ca\u4e49\\': \\'\u84b8\u53d1\\', \\'\u8bcd\u6027\\': \\'n\\'},\n        \\'carpenter\\': {\\'\u91ca\u4e49\\': \\'\u6728\u5320\\', \\'\u8bcd\u6027\\': \\'n\\'}}\n<\/pre>\n<\/div>\n
\u5e38\u89c4\u505a\u6cd5\u901a\u5e38\u662f\u8fd9\u6837\uff0c\u5373\u5148\u9a8c\u8bc1 key \u662f\u5426\u5728\u5b57\u5178\u4e2d\uff0c\u5982\u679c\u4e0d\u5b58\u5728\uff0c\u5219\u52a0\u5165\u5b57\u5178\uff1a<\/p>\n
\n
if \\'future\\' not in dict:\n    dict[\\'future\\']={\\'\u91ca\u4e49\\': \\'\u672a\u6765\\', \\'\u8bcd\u6027\\': \\'n\\'}\n<\/pre>\n<\/div>\n
\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u5b57\u5178\u7684 setdefault() \u65b9\u6cd5\uff0c\u76f4\u63a5\u5b9e\u73b0\u4e0a\u8ff0\u529f\u80fd\uff1a<\/p>\n
\n
dict.setdefault(\\'future\\', {\\'\u91ca\u4e49\\': \\'\u672a\u6765\\', \\'\u8bcd\u6027\\': \\'n\\'})\n<\/pre>\n<\/div>\n
\u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n
{\\’evaporation\\’: {\\’\u91ca\u4e49\\’: \\’\u84b8\u53d1\\’, \\’\u8bcd\u6027\\’: \\’n\\’}, \\’carpenter\\’: {\\’\u91ca\u4e49\\’: \\’\u6728\u5320\\’, \\’\u8bcd\u6027\\’: \\’n\\’}, \\’future\\’: {\\’\u91ca\u4e49\\’: \\’\u672a\u6765\\’, \\’\u8bcd\u6027\\’: \\’n\\’}}<\/p><\/blockquote>\n
\u4f20\u9012\u7ed9 setdefault \u65b9\u6cd5\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u8981\u68c0\u67e5\u7684\u952e\u3002\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u5982\u679c\u8be5\u952e\u4e0d\u5b58\u5728\u9700\u8981\u8bbe\u7f6e\u7684\u9ed8\u8ba4\u503c\u3002\u5982\u679c\u8be5\u952e\u5b58\u5728\uff0c\u8be5\u65b9\u6cd5\u4f1a\u76f4\u63a5\u8fd4\u56de\u952e\u6240\u5bf9\u5e94\u7684\u503c\uff1a<\/p>\n
\n
carpenter = dict.setdefault(\\'carpenter\\', \\'\u672a\u6536\u5165\u672c\u8bcd\u5178\\')\nprint(\\'carpenter = \\' + str(carpenter))\n<\/pre>\n<\/div>\n
\u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n
carpenter = {\\’\u91ca\u4e49\\’: \\’\u6728\u5320\\’, \\’\u8bcd\u6027\\’: \\’n\\’}<\/p><\/blockquote>\n
\u5229\u7528 setdefault \u65b9\u6cd5\uff0c\u6211\u4eec\u53ef\u4ee5\u5f88\u65b9\u4fbf\u5730\u7edf\u8ba1\u51fa\uff0c\u4e00\u4e2a\u5b57\u7b26\u4e32\u6240\u62e5\u6709\u5b57\u7b26\u51fa\u73b0\u6b21\u6570\uff1a<\/p>\n
\n
content = \\'\u7f8e\u56fd\u56fd\u5bb6\u822a\u7a7a\u822a\u5929\u5c40(NASA)\u5c40\u957f\u5409\u59c6\u00b7\u5e03\u83b1\u767b\u65af\u6c40\u65e5\u524d\u8868\u793a\uff0c\u5982\u679c\u5bf9\u592a\u7a7a\u63a2\u7d22\u6280\u672f\u516c\u53f8(SpaceX)\u8f7d\u4eba\u201c\u9f99\u201d\u98de\u8239\u8fdb\u884c\u7684\u6d4b\u8bd5\u7ed3\u679c\u662f\u80af\u5b9a\u7684\u8bdd\uff0c\u8be5\u516c\u53f8\u7684\u98de\u8239\u5c06\u6700\u65e9\u4e8e\u660e\u5e74\u628a\u7f8e\u56fd\u5b87\u822a\u5458\u9001\u5f80\u56fd\u9645\u7a7a\u95f4\u7ad9\u3002\u8fc4\u4eca\u4e3a\u6b62\uff0cSpaceX\u4ece\u672a\u5c06\u4eba\u7c7b\u9001\u5165\u592a\u7a7a\uff0c\u4e00\u76f4\u8fd0\u9001\u7684\u53ea\u6709\u8d27\u7269\u3002\\'\ncount = {}\nfor char in content:\n   count.setdefault(char, 0)\n   count[char] = count[char] + 1\nprint(count)\n<\/pre>\n<\/div>\n
\u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n
{\\’\u7f8e\\’: 2, \\’\u56fd\\’: 4, \\’\u5bb6\\’: 1, \\’\u822a\\’: 3, \\’\u7a7a\\’: 4, \\’\u5929\\’: 1, \\’\u5c40\\’: 2, \\'(\\’: 2, \\’N\\’: 1, \\’A\\’: 2, \\’S\\’: 3, \\’)\\’: 2, \\’\u957f\\’: 1, \\’\u5409\\’: 1, \\’\u59c6\\’: 1, \\’\u00b7\\’: 1, \\’\u5e03\\’: 1, \\’\u83b1\\’: 1, \\’\u767b\\’: 1, \\’\u65af\\’: 1, \\’\u6c40\\’: 1, \\’\u65e5\\’: 1, \\’\u524d\\’: 1, \\’\u8868\\’: 1, \\’\u793a\\’: 1, \\’\uff0c\\’: 4, \\’\u5982\\’: 1, \\’\u679c\\’: 2, \\’\u5bf9\\’: 1, \\’\u592a\\’: 2, \\’\u63a2\\’: 1, \\’\u7d22\\’: 1, \\’\u6280\\’: 1, \\’\u672f\\’: 1, \\’\u516c\\’: 2, \\’\u53f8\\’: 2, \\’p\\’: 2, \\’a\\’: 2, \\’c\\’: 2, \\’e\\’: 2, \\’X\\’: 2, \\’\u8f7d\\’: 1, \\’\u4eba\\’: 2, \\’\u201c\\’: 1, \\’\u9f99\\’: 1, \\’\u201d\\’: 1, \\’\u98de\\’: 2, \\’\u8239\\’: 2, \\’\u8fdb\\’: 1, \\’\u884c\\’: 1, \\’\u7684\\’: 4, \\’\u6d4b\\’: 1, \\’\u8bd5\\’: 1, \\’\u7ed3\\’: 1, \\’\u662f\\’: 1, \\’\u80af\\’: 1, \\’\u5b9a\\’: 1, \\’\u8bdd\\’: 1, \\’\u8be5\\’: 1, \\’\u5c06\\’: 2, \\’\u6700\\’: 1, \\’\u65e9\\’: 1, \\’\u4e8e\\’: 1, \\’\u660e\\’: 1, \\’\u5e74\\’: 1, \\’\u628a\\’: 1, \\’\u5b87\\’: 1, \\’\u5458\\’: 1, \\’\u9001\\’: 3, \\’\u5f80\\’: 1, \\’\u9645\\’: 1, \\’\u95f4\\’: 1, \\’\u7ad9\\’: 1, \\’\u3002\\’: 2, \\’\u8fc4\\’: 1, \\’\u4eca\\’: 1, \\’\u4e3a\\’: 1, \\’\u6b62\\’: 1, \\’\u4ece\\’: 1, \\’\u672a\\’: 1, \\’\u7c7b\\’: 1, \\’\u5165\\’: 1, \\’\u4e00\\’: 1, \\’\u76f4\\’: 1, \\’\u8fd0\\’: 1, \\’\u53ea\\’: 1, \\’\u6709\\’: 1, \\’\u8d27\\’: 1, \\’\u7269\\’: 1}<\/p><\/blockquote>\n<\/article>\n","protected":false},"excerpt":{"rendered":"
\u5047\u8bbe\u6709\u8fd9\u6837\u4e00\u4e2a\u5b57\u5178\u5bf9\u8c61\uff1a dict = {\\’evaporation\\’: {\\’\u91ca\u4e49\\’: \\’\u84b8\u53d1\\’,  …<\/p>\n
  \u5feb\u901f\u4e3a Python \u5b57\u5178\u8bbe\u7f6e\u65b0\u7684\u503c<\/span> \u67e5\u770b\u5168\u6587 »<\/a><\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":""},"categories":[106,126],"tags":[],"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false,"mailpoet_newsletter_max":false,"woocommerce_thumbnail":false,"woocommerce_single":false,"woocommerce_gallery_thumbnail":false,"shop_catalog":false,"shop_single":false,"shop_thumbnail":false},"uagb_author_info":{"display_name":"weijing","author_link":"http:\/\/www.weijing.co\/?author=4"},"uagb_comment_info":0,"uagb_excerpt":"\u5047\u8bbe\u6709\u8fd9\u6837\u4e00\u4e2a\u5b57\u5178\u5bf9\u8c61\uff1a dict = {\\'evaporation\\': {\\'\u91ca\u4e49\\': \\'\u84b8\u53d1\\', …","_links":{"self":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/posts\/1689"}],"collection":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1689"}],"version-history":[{"count":0,"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/posts\/1689\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1689"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1689"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1689"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}