{"id":299302,"date":"2021-01-18T03:56:53","date_gmt":"2021-01-17T19:56:53","guid":{"rendered":"http:\/\/4563.org\/?p=299302"},"modified":"2021-01-18T03:56:53","modified_gmt":"2021-01-17T19:56:53","slug":"tee-%e5%87%bd%e6%95%b0%e7%b1%bb%e4%bc%bc%e4%ba%8e%e6%88%91%e4%bb%ac%e7%86%9f%e7%9f%a5%e7%9a%84%e7%bb%86%e8%83%9e%e5%88%86%e8%a3%82","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=299302","title":{"rendered":"tee \u51fd\u6570\u7c7b\u4f3c\u4e8e\u6211\u4eec\u719f\u77e5\u7684\u7ec6\u80de\u5206\u88c2"},"content":{"rendered":"<div>\n<div>\n<div>\n<h1>                  tee \u51fd\u6570\u7c7b\u4f3c\u4e8e\u6211\u4eec\u719f\u77e5\u7684\u7ec6\u80de\u5206\u88c2               <\/h1>\n<p> <\/p>\n<div>\n<div> <span>\u8cc7\u6df1\u5927\u4f6c : fanqieipnet <\/span>  <span><i><\/i> 5<\/span> <\/div>\n<div> <\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<div isfirst=\"1\">                        tee \u51fd\u6570\u7c7b\u4f3c\u4e8e\u6211\u4eec\u719f\u77e5\u7684\u7ec6\u80de\u5206\u88c2\u3002\u5177\u4f53\u662f\u600e\u4e48\u56de\u4e8b\u5462?\u4eca\u5929\u756a\u8304\u52a0\u901f\u5c31\u6765\u8bf4\u4e00\u4e0b\u3002<\/p>\n<p>\u3000\u3000 tee \u51fd\u6570\u7c7b\u4f3c\u4e8e\u6211\u4eec\u719f\u77e5\u7684\u7ec6\u80de\u5206\u88c2\uff0c\u5b83\u80fd\u590d\u5236\u539f\u8fed\u4ee3\u5668 n \u4e2a\uff0c\u539f\u578b\u5982\u4e0b\uff1a<\/p>\n<p>\u3000\u3000 tee(iterable, n=2)<\/p>\n<p>\u3000\u3000\u5e94\u7528\u5982\u4e0b\uff0c\u53ef\u4ee5\u770b\u51fa\u590d\u5236\u51fa\u7684\u4e24\u4e2a\u8fed\u4ee3\u5668\u662f\u72ec\u7acb\u7684<\/p>\n<p>\u3000\u3000 a = tee([1,4,6,4,1],2)<\/p>\n<p>\u3000\u3000 In [51]: next(a[0])<\/p>\n<p>\u3000\u3000 Out[51]: 1<\/p>\n<p>\u3000\u3000 In [52]: next(a[1])<\/p>\n<p>\u3000\u3000 Out[52]: 1<\/p>\n<p>\u3000\u3000\u5b9e\u73b0\u5b83\u7684\u4ee3\u7801\u5927\u6982\u5982\u4e0b\uff1a<\/p>\n<p>\u3000\u3000 def tee(iterable, n=2):<\/p>\n<p>\u3000\u3000 it = iter(iterable)<\/p>\n<p>\u3000\u3000 deques = [collections.deque() for i in range(n)]<\/p>\n<p>\u3000\u3000 def gen(mydeque):<\/p>\n<p>\u3000\u3000 while True:<\/p>\n<p>\u3000\u3000 if not mydeque:<\/p>\n<p>\u3000\u3000 try:<\/p>\n<p>\u3000\u3000 newval = next(it)<\/p>\n<p>\u3000\u3000 except StopIteration:<\/p>\n<p>\u3000\u3000 return<\/p>\n<p>\u3000\u3000 for d in deques:<\/p>\n<p>\u3000\u3000 d.append(newval)<\/p>\n<p>\u3000\u3000 yield mydeque.popleft()<\/p>\n<p>\u3000\u3000 return tuple(gen(d) for d in deques)<\/p>\n<p>\u3000\u3000 tee \u5b9e\u73b0\u5185\u90e8\u4f7f\u7528\u4e00\u4e2a\u961f\u5217\u7c7b\u578b deques\uff0c\u8d77\u521d\u751f\u6210\u7a7a\u961f\u5217\uff0c\u5411\u590d\u5236\u51fa\u6765\u7684\u6bcf\u4e2a\u961f\u5217\u4e2d\u6dfb\u52a0\u5143\u7d20 newval, \u540c\u65f6 yield \u5f53\u524d\u88ab\u8c03\u7528\u7684 mydeque \u4e2d\u7684\u6700\u5de6\u5143\u7d20\u3002<\/p>\n<p>\u3000\u3000 map \u53d8\u4f53<\/p>\n<p>\u3000\u3000 starmap \u53ef\u4ee5\u770b\u505a\u662f map \u7684\u53d8\u4f53\uff0c\u5b83\u80fd\u66f4\u52a0\u8282\u7701\u5185\u5b58\uff0c\u540c\u65f6 iterable \u7684\u5143\u7d20\u5fc5\u987b\u4e5f\u4e3a\u53ef\u8fed\u4ee3\u5bf9\u8c61\uff0c\u539f\u578b\u5982\u4e0b\uff1a<\/p>\n<p>\u3000\u3000 starmap(function, iterable)<\/p>\n<p>\u3000\u3000\u5e94\u7528\u5b83\uff1a<\/p>\n<p>\u3000\u3000 In [63]: list(starmap(lambda x,y: str(x)+&#8217;-&#8216;+str(y), [(&#8216;a&#8217;,1),(&#8216;b&#8217;,2),(&#8216;c&#8217;,3)]))<\/p>\n<p>\u3000\u3000 Out[63]: [&#8216;a-1&#8217;, &#8216;b-2&#8217;, &#8216;c-3&#8217;]<\/p>\n<p>\u3000\u3000 starmap \u7684\u5b9e\u73b0\u7ec6\u8282\u5982\u4e0b\uff1a<\/p>\n<p>\u3000\u3000 def starmap(function, iterable):<\/p>\n<p>\u3000\u3000 for args in iterable:<\/p>\n<p>\u3000\u3000 yield function(*args)      <\/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>tee \u51fd\u6570\u7c7b\u4f3c\u4e8e\u6211\u4eec\u719f\u77e5\u7684\u7ec6\u80de\u5206&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\/299302"}],"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=299302"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/299302\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=299302"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=299302"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=299302"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}