{"id":8697,"date":"2016-03-30T20:16:04","date_gmt":"2016-03-31T01:16:04","guid":{"rendered":"httpss:\/\/www.powenko.com\/wordpress\/?p=8697"},"modified":"2016-03-30T20:27:52","modified_gmt":"2016-03-31T01:27:52","slug":"python-%e5%9f%b7%e8%a1%8c-command-line","status":"publish","type":"post","link":"https:\/\/www.powenko.com\/wordpress\/?p=8697","title":{"rendered":"Python \u57f7\u884c  Command Line"},"content":{"rendered":"<p>\u4e0b\u9762\u662f\u8abf\u7528\u5916\u90e8\u7a0b\u5f0f\u53ca\u5404\u81ea\u7684\u512a\u9ede\u548c\u7f3a\u9ede\u7684\u5404\u7a2e\u65b9\u5f0f\u7684\u7e3d\u7d50\uff1a<\/p>\n<h2>os.system<\/h2>\n<p>\u4f7f\u7528oos.system(&#8220;some_command with args&#8221;)\u50b3\u905e\u547d\u4ee4\u548c\u53c3\u6578\u5230\u7cfb\u7d71\u7684\u5916\u6bbc\u3002\u9019\u662f\u4e0d\u932f\u7684\uff0c\u56e0\u70ba\u4f60\u5176\u5be6\u53ef\u4ee5\u5728\u9019\u7a2e\u65b9\u5f0f\u904b\u884c\u591a\u500b\u547d\u4ee4\uff0c\u4e26\u5efa\u7acb\u7ba1\u9053\u548c\u8f38\u5165\/\u8f38\u51fa\u91cd\u5b9a\u5411\u3002\u4f8b\u5982\uff0c<\/p>\n<p>os.system(&#8220;some_command &lt; input_file | another_command &gt; output_file&#8221;)<br \/>\n\u4e0d\u904e\uff0c\u96d6\u7136\u9019\u5f88\u65b9\u4fbf\uff0c\u4f60\u5fc5\u9808\u624b\u52d5\u8655\u7406\u7684\u6307\u4ee4\u7684\u6587\u5b57\uff0c\u5982\u7a7a\u683c\u7b49\u3002\u53e6\u4e00\u65b9\u9762\u8f49\u7fa9\uff0c\u9019\u4e5f\u53ef\u4ee5\u8b93\u4f60\u904b\u884c\u7684\u662f\u7c21\u55ae\u7684shell\u547d\u4ee4\uff0c\u4e26\u6c92\u6709\u5be6\u969b\u7684\u5916\u90e8\u7a0b\u5e8f\u7684\u547d\u4ee4\u3002<br \/>\n<a href=\"httpsss:\/\/docs.python.org\/2\/library\/os.html#os.system\">see documentation<\/a><\/p>\n<h2>os.popen<\/h2>\n<p>stream = os.popen(&#8220;some_command with args&#8221;)\u00a0\uff0c\u5c07\u505a\u540c\u6a23\u7684\u4e8b\u60c5\uff0c\u4f7f\u7528os.system\u4f46\u5b83\u7d66\u4f60\u4e00\u500b\u985e\u6587\u4ef6\u5c0d\u8c61\uff0c\u4f60\u53ef\u4ee5\u7528\u5b83\u4f86\u8a2a\u554f\u6a19\u6e96\u7684\u8f38\u5165\/\u8f38\u51fa\u9019\u4e00\u9032\u7a0b\u3002\u9084\u6709\u7684popen\u5176\u4ed63\u8b8a\u7a2e\uff0c\u6240\u6709\u8655\u7406I \/ O\u7565\u6709\u4e0d\u540c\u3002\u5982\u679c\u60a8\u50b3\u905e\u7684\u4e00\u5207\u4f5c\u70ba\u4e00\u500b\u5b57\u4e32\uff0c\u90a3\u9ebc\u4f60\u7684\u547d\u4ee4\u50b3\u905e\u7d66\u5916\u9762;\u5982\u679c\u5c07\u5b83\u5011\u4f5c\u70ba\u4e00\u500b\u5217\u8868\uff0c\u90a3\u9ebc\u4f60\u4e0d\u5fc5\u64d4\u5fc3\u9003\u907f\u4efb\u4f55\u4e8b\u60c5\u3002<\/p>\n<p><a href=\"httpsss:\/\/docs.python.org\/2\/library\/os.html#os.popen\">see documentation<\/a><\/p>\n<p>&nbsp;<\/p>\n<p class=\"default prettyprint prettyprinted\">\n<h2 class=\"default prettyprint prettyprinted\"><code><span class=\"pln\">subprocess<\/span><span class=\"pun\">.<\/span><span class=\"typ\">Popen<\/span><\/code><\/h2>\n<p>\u8a72subprocess \u7528\u610f\u662f\u66ff\u4ee3os.popen\uff0c\u4f46\u6709\u88ab\u7a0d\u5fae\u8907\u96dc\u7684\u7f3a\u9ede\u3002\u4f8b\u5982\uff0c<\/p>\n<p><span class=\"kwd\">print<\/span><span class=\"pln\"> subprocess<\/span><span class=\"pun\">.<\/span><span class=\"typ\">Popen<\/span><span class=\"pun\">(<\/span><span class=\"str\">&#8220;echo Hello World&#8221;<\/span><span class=\"pun\">,<\/span><span class=\"pln\"> shell<\/span><span class=\"pun\">=<\/span><span class=\"kwd\">True<\/span><span class=\"pun\">,<\/span><span class=\"pln\"> stdout<\/span><span class=\"pun\">=<\/span><span class=\"pln\">subprocess<\/span><span class=\"pun\">.<\/span><span class=\"pln\">PIPE<\/span><span class=\"pun\">).<\/span><span class=\"pln\">stdout<\/span><span class=\"pun\">.<\/span><span class=\"pln\">read<\/span><span class=\"pun\">()<\/span><\/p>\n<p>\u4ee3\u66ff<\/p>\n<pre class=\"default prettyprint prettyprinted\"><code><span class=\"kwd\">print<\/span><span class=\"pln\"> os<\/span><span class=\"pun\">.<\/span><span class=\"pln\">popen<\/span><span class=\"pun\">(<\/span><span class=\"str\">\"echo Hello World\"<\/span><span class=\"pun\">).<\/span><span class=\"pln\">read<\/span><span class=\"pun\">()<\/span><\/code><\/pre>\n<p>\u800csubprocess\u7684\u9078\u9805\u4e2d\u6709\u4e00\u500b\u7d71\u4e00\u7684\u985e\uff0c\u800c\u4e0d\u662f4\u500b\u4e0d\u540c\u7684popen\u529f\u80fd\u3002<br \/>\n<a href=\"httpsss:\/\/docs.python.org\/2\/library\/subprocess.html#popen-constructor\">see documentation<\/a><\/p>\n<p>&nbsp;<\/p>\n<h2 class=\"default prettyprint prettyprinted\"><code><span class=\"pln\">subprocess<\/span><span class=\"pun\">.<\/span><span class=\"pln\">call<\/span><\/code><\/h2>\n<p>\u9019\u57fa\u672c\u4e0a\u5c31\u50cfPOPEN\u985e\uff0c\u4e26\u63a1\u53d6\u6240\u6709\u76f8\u540c\u7684\u53c3\u6578\uff0c\u4f46\u5b83\u53ea\u662f\u7b49\u5f85\uff0c\u76f4\u5230\u547d\u4ee4\u5b8c\u6210\uff0c\u8b93\u60a8\u7684\u8fd4\u56de\u4ee3\u78bc\u3002\u4f8b\u5982\uff1a<\/p>\n<pre class=\"default prettyprint prettyprinted\"><code><span class=\"pln\">return_code <\/span><span class=\"pun\">=<\/span><span class=\"pln\"> subprocess<\/span><span class=\"pun\">.<\/span><span class=\"pln\">call<\/span><span class=\"pun\">(<\/span><span class=\"str\">\"echo Hello World\"<\/span><span class=\"pun\">,<\/span><span class=\"pln\"> shell<\/span><span class=\"pun\">=<\/span><span class=\"kwd\">True<\/span><span class=\"pun\">)<\/span>  <\/code><\/pre>\n<p><a href=\"httpsss:\/\/docs.python.org\/2\/library\/subprocess.html#subprocess.call\">see documentation<\/a><\/p>\n<p>&nbsp;<\/p>\n<h2 class=\"default prettyprint prettyprinted\"><code><span class=\"pln\">subprocess.run<\/span><\/code><\/h2>\n<p>\u5982\u679c\u4f60\u4f7f\u7528 Python\u76843\u200b\u200b.5\u6216\u66f4\u9ad8\u7248\u672c\uff0c\u53ef\u4ee5\u4f7f\u7528\u65b0\u7684subprocess.run\u529f\u80fd\uff0c\u9019\u662f\u5f88\u591a\u50cf\u4e0a\u9762\u7684\uff0c\u4f46\u66f4\u9748\u6d3b\uff0c\u7576\u547d\u4ee4\u5b8c\u6210\u57f7\u884c\u8fd4\u56de<a href=\"httpsss:\/\/docs.python.org\/3.5\/library\/subprocess.html#subprocess.CompletedProcess\">CompletedProcess<\/a> \u5c0d\u8c61\u3002<\/p>\n<h2>os<\/h2>\n<p>os\u6a21\u584a\u9084\u64c1\u6709fork\/exec\/spawn \u529f\u80fd\uff0c\u4f46\u6211\u4e0d\u5efa\u8b70\u76f4\u63a5\u4f7f\u7528\u5b83\u5011\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h2>\u7d50\u8ad6<\/h2>\n<p>&nbsp;<\/p>\n<p>subprocess \u56e0\u8a72\u6700\u597d\u7684\u65b9\u6cd5\uff0c\u8acb\u6ce8\u610f\uff0c\u5c0d\u65bc\u60a8\u901a\u904e\u6700\u5f8c\u7684\u547d\u4ee4\u6240\u6709\u7684\u65b9\u6cd5\u7531shell\u4f5c\u70ba\u5b57\u7b26\u4e32\u4f86\u57f7\u884c\uff0c\u4f60\u6709\u8cac\u4efb\u9003\u907f\u5b83\u6709\u56b4\u91cd\u7684\u5b89\u5168\u96b1\u60a3\uff0c\u5982\u679c\u4f60\u628a\u9019\u500b\u5b57\u7b26\u4e32\u7684\u4efb\u4f55\u90e8\u5206\u4e0d\u80fd\u5b8c\u5168\u4fe1\u4efb\uff08\u4f8b\u5982\uff0c\u5982\u679c\u4e00\u500b\u7528\u6236\u8f38\u5165\u4e00\u4e9b\/\u5b57\u7b26\u4e32\u7684\u4efb\u4f55\u90e8\u5206\uff09\u3002\u5982\u679c\u53ea\u662f\u4e0d\u78ba\u5b9a\u4f7f\u7528\u9019\u4e9b\u65b9\u6cd5\u8207\u5e38\u91cf\u3002\u70ba\u4e86\u7d66\u4f60\u4e00\u500b\u63d0\u793a\u7684\u5f71\u97ff\u8003\u616e\u9019\u500b\u4ee3\u78bc<\/p>\n<pre class=\"default prettyprint prettyprinted\"><code><span class=\"kwd\">print<\/span><span class=\"pln\"> subprocess<\/span><span class=\"pun\">.<\/span><span class=\"typ\">Popen<\/span><span class=\"pun\">(<\/span><span class=\"str\">\"echo %s \"<\/span> <span class=\"pun\">%<\/span><span class=\"pln\"> user_input<\/span><span class=\"pun\">,<\/span><span class=\"pln\"> stdout<\/span><span class=\"pun\">=<\/span><span class=\"pln\">PIPE<\/span><span class=\"pun\">).<\/span><span class=\"pln\">stdout<\/span><span class=\"pun\">.<\/span><span class=\"pln\">read<\/span><span class=\"pun\">()<\/span><\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u4e0b\u9762\u662f\u8abf\u7528\u5916\u90e8\u7a0b\u5f0f\u53ca\u5404\u81ea\u7684\u512a\u9ede\u548c\u7f3a\u9ede\u7684\u5404\u7a2e\u65b9\u5f0f\u7684\u7e3d\u7d50\uff1a os.system \u4f7f\u7528oos.system(&#038;#82 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":8698,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[],"class_list":["post-8697","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ch29-system-"],"_links":{"self":[{"href":"https:\/\/www.powenko.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/8697"}],"collection":[{"href":"https:\/\/www.powenko.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.powenko.com\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.powenko.com\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.powenko.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=8697"}],"version-history":[{"count":3,"href":"https:\/\/www.powenko.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/8697\/revisions"}],"predecessor-version":[{"id":8701,"href":"https:\/\/www.powenko.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/8697\/revisions\/8701"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.powenko.com\/wordpress\/index.php?rest_route=\/wp\/v2\/media\/8698"}],"wp:attachment":[{"href":"https:\/\/www.powenko.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=8697"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.powenko.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=8697"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.powenko.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=8697"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}