{"id":316997,"date":"2021-02-04T10:17:43","date_gmt":"2021-02-04T02:17:43","guid":{"rendered":"http:\/\/4563.org\/?p=316997"},"modified":"2021-02-04T10:17:43","modified_gmt":"2021-02-04T02:17:43","slug":"%e8%a3%85%e9%a5%b0%e5%99%a8%e5%b0%b1%e6%98%af%e4%b8%80%e4%b8%aa%e8%bf%94%e5%9b%9e%e5%87%bd%e6%95%b0%e7%9a%84%e9%ab%98%e9%98%b6%e5%87%bd%e6%95%b0","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=316997","title":{"rendered":"\u88c5\u9970\u5668\u5c31\u662f\u4e00\u4e2a\u8fd4\u56de\u51fd\u6570\u7684\u9ad8\u9636\u51fd\u6570"},"content":{"rendered":"<div>\n<div>\n<div>\n<h1>                  \u88c5\u9970\u5668\u5c31\u662f\u4e00\u4e2a\u8fd4\u56de\u51fd\u6570\u7684\u9ad8\u9636\u51fd\u6570               <\/h1>\n<p> <\/p>\n<div>\n<div> <span>\u8cc7\u6df1\u5927\u4f6c : fanqieipnet <\/span>  <span><i><\/i> 6<\/span> <\/div>\n<div> <\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<div isfirst=\"1\">                        \u88c5\u9970\u5668\u5c31\u662f\u4e00\u4e2a\u8fd4\u56de\u51fd\u6570\u7684\u9ad8\u9636\u51fd\u6570\u3002\u5177\u4f53\u662f\u600e\u4e48\u56de\u4e8b\u5462?\u4eca\u5929\u756a\u8304\u52a0\u901f\u5c31\u6765\u8bb2\u4e00\u4e0b\u3002<\/p>\n<p>\u3000\u3000\u672c\u8d28\u4e0a\uff0c\u88c5\u9970\u5668(decorator)\u5c31\u662f\u4e00\u4e2a\u8fd4\u56de\u51fd\u6570\u7684\u9ad8\u9636\u51fd\u6570\u3002\u62ff\u5230\u4e00\u4e2a\u51fd\u6570\uff0c\u8fd4\u56de\u4e00\u4e2a\u51fd\u6570\uff0c\u6216\u8005\u62ff\u5230\u4e00\u4e2a\u7c7b\uff0c\u8fd4\u56de\u53e6\u4e00\u4e2a\u7c7b\u3002<\/p>\n<p>\u3000\u3000\u8fd9\u662f\u666e\u901a\u51fd\u6570\uff0c\u7ec4\u88c5\u540e\u5b9e\u73b0\u7684\u6548\u679c\uff1a<\/p>\n<p>\u3000\u3000 def use_logging(func):<\/p>\n<p>\u3000\u3000 print(&#8220;%s is running&#8221; % func.__name__)<\/p>\n<p>\u3000\u3000 return func<\/p>\n<p>\u3000\u3000 def bar():<\/p>\n<p>\u3000\u3000 print(&#8216;i am bar&#8217;)<\/p>\n<p>\u3000\u3000 use_logging(bar)()<\/p>\n<p>\u3000\u3000\u5982\u679c\u4f7f\u7528\u88c5\u9970\u5668\uff0c\u53ef\u4ee5\u8fd9\u4e48\u505a\uff1a<\/p>\n<p>\u3000\u3000 def use_logging(func):<\/p>\n<p>\u3000\u3000 print(&#8220;%s is running&#8221; % func.__name__)<\/p>\n<p>\u3000\u3000 return func<\/p>\n<p>\u3000\u3000 @use_logging<\/p>\n<p>\u3000\u3000 def bar():<\/p>\n<p>\u3000\u3000 print(&#8216;i am bar&#8217;)<\/p>\n<p>\u3000\u3000 bar()<\/p>\n<p>\u3000\u3000\u4ee5\u4e0a\u8f93\u51fa\uff0c\u90fd\u4e3a\u5982\u4e0b\uff1a<\/p>\n<p>\u3000\u3000 bar is running<\/p>\n<p>\u3000\u3000 i am bar<\/p>\n<p>\u3000\u3000\u5bf9\u6bd4\u4ee5\u4e0a\u4e24\u79cd\u5199\u6cd5\uff0c\u53ef\u4ee5\u770b\u51fa\uff0c\u88c5\u9970\u5668\u5c31\u662f\u4e00\u4e2a\u8fd4\u56de\u51fd\u6570\u7684\u9ad8\u9636\u51fd\u6570\u3002python \u63d0\u4f9b\u4e86 @ \u7b26\u53f7\u4f5c\u4e3a\u88c5\u9970\u5668\u7684\u8bed\u6cd5\u7cd6\uff0c\u4f7f\u6211\u4eec\u66f4\u65b9\u4fbf\u7684\u5e94\u7528\u88c5\u9970\u51fd\u6570\u3002\u4f46\u4f7f\u7528\u8bed\u6cd5\u7cd6\u8981\u6c42\u88c5\u9970\u51fd\u6570\u5fc5\u987b return \u4e00\u4e2a\u51fd\u6570\u5bf9\u8c61\u3002<\/p>\n<p>\u3000\u3000 Python \u9664\u4e86\u80fd\u652f\u6301 OOP \u7684 decorator \u5916\uff0c\u76f4\u63a5\u4ece\u8bed\u6cd5\u5c42\u6b21\u652f\u6301 decorator \u3002Python \u7684 decorator \u53ef\u4ee5\u7528\u51fd\u6570\u5b9e\u73b0\uff0c\u4e5f\u53ef\u4ee5\u7528\u7c7b\u5b9e\u73b0\u3002<\/p>\n<p>\u3000\u3000 decorator \u53ef\u4ee5\u589e\u5f3a\u51fd\u6570\u7684\u529f\u80fd\uff0c\u5b9a\u4e49\u8d77\u6765\u867d\u7136\u6709\u70b9\u590d\u6742\uff0c\u4f46\u4f7f\u7528\u8d77\u6765\u975e\u5e38\u7075\u6d3b\u548c\u65b9\u4fbf\u3002\u4e0b\u9762\u4e3e\u4e00\u4e2a\u4f8b\u5b50\uff1a\u8bbe\u8ba1\u4e00\u4e2a decorator\uff0c\u5b83\u53ef\u4f5c\u7528\u4e8e\u4efb\u4f55\u51fd\u6570\u4e0a\uff0c\u5e76\u6253\u5370\u8be5\u51fd\u6570\u7684\u6267\u884c\u65f6\u95f4\u3002<\/p>\n<p>\u3000\u3000 import time<\/p>\n<p>\u3000\u3000 def log(func):<\/p>\n<p>\u3000\u3000 def wrapper(*args,**kw):<\/p>\n<p>\u3000\u3000 t1 = time.time()<\/p>\n<p>\u3000\u3000 func(*args,**kw)<\/p>\n<p>\u3000\u3000 print(&#8216;%s excute in %s ms&#8217;%(func.__name__,1000*(time.time()-t1)))<\/p>\n<p>\u3000\u3000 return wrapper<\/p>\n<p>\u3000\u3000 @log<\/p>\n<p>\u3000\u3000 def slow(x,y,z):<\/p>\n<p>\u3000\u3000 time.sleep(5)<\/p>\n<p>\u3000\u3000 @log<\/p>\n<p>\u3000\u3000 def fast(x,y):<\/p>\n<p>\u3000\u3000 time.sleep(2)<\/p>\n<p>\u3000\u3000 slow(4,5,6)<\/p>\n<p>\u3000\u3000 fast(3,5)<\/p>\n<p>\u3000\u3000 print(slow.__name__)<\/p>\n<p>\u3000\u3000\u4ee5\u4e0a\u5199\u6cd5\u6709\u4e9b\u7f3a\u9677\uff0c\u56e0\u4e3a\u8fd4\u56de\u7684\u90a3\u4e2a wrapper()\u51fd\u6570\u540d\u5b57\u5c31\u662f&#8217;wrapper&#8217;\uff0c\u6240\u4ee5\uff0c\u9700\u8981\u628a\u539f\u59cb\u51fd\u6570\u7684__name__\u7b49\u5c5e\u6027\u590d\u5236\u5230 wrapper()\u51fd\u6570\u4e2d\uff0c\u5426\u5219\uff0c\u6709\u4e9b\u4f9d\u8d56\u51fd\u6570\u7b7e\u540d\u7684\u4ee3\u7801\u6267\u884c\u5c31\u4f1a\u51fa\u9519\u3002<\/p>\n<p>\u3000\u3000\u4e0d\u9700\u8981\u7f16\u5199 wrapper.__name__ = func.__name__\u8fd9\u6837\u7684\u4ee3\u7801\uff0cPython \u5185\u7f6e\u7684 functools.wraps \u5c31\u662f\u5e72\u8fd9\u4e2a\u4e8b\u7684\uff0c\u6240\u4ee5\uff0c\u4e00\u4e2a\u5b8c\u6574\u7684 decorator \u7684\u5199\u6cd5\u5982\u4e0b\uff1a<\/p>\n<p>\u3000\u3000 import time,functools<\/p>\n<p>\u3000\u3000 def log(func):<\/p>\n<p>\u3000\u3000 @functools.wraps(func)<\/p>\n<p>\u3000\u3000 def wrapper(*args,**kw):<\/p>\n<p>\u3000\u3000 t1 = time.time()<\/p>\n<p>\u3000\u3000 func(*args,**kw)<\/p>\n<p>\u3000\u3000 print(&#8216;%s excute in %s ms&#8217;%(func.__name__,1000*(time.time()-t1)))<\/p>\n<p>\u3000\u3000 return wrapper<\/p>\n<p>\u3000\u3000 @log<\/p>\n<p>\u3000\u3000 def slow(x,y,z):<\/p>\n<p>\u3000\u3000 time.sleep(5)<\/p>\n<p>\u3000\u3000 @log<\/p>\n<p>\u3000\u3000 def fast(x,y):<\/p>\n<p>\u3000\u3000 time.sleep(2)<\/p>\n<p>\u3000\u3000 slow(4,5,6)<\/p>\n<p>\u3000\u3000 fast(3,5)<\/p>\n<p>\u3000\u3000 print(slow.__name__)<\/p>\n<p>\u3000\u3000\u4ee5\u4e0a\u5c31\u662f\u88c5\u9970\u5668\u7684\u4e3b\u8981\u7528\u6cd5\u3002      <\/p><\/div>\n<div> <b>\u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (<span>0<\/span>)        <\/div>\n<div> <\/div>\n<\/p><\/div>\n<\/p><\/div>\n<ul>\n<li>\n","protected":false},"excerpt":{"rendered":"<p>\u88c5\u9970\u5668\u5c31\u662f\u4e00\u4e2a\u8fd4\u56de\u51fd\u6570\u7684\u9ad8\u9636\u51fd\u6570 &hellip;<\/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\/316997"}],"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=316997"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/316997\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=316997"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=316997"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=316997"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}