{"id":12739,"date":"2024-03-14T16:31:56","date_gmt":"2024-03-14T16:31:56","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-use-subprocess-popen-to-get-the-return-value-in-python\/"},"modified":"2025-08-05T06:09:26","modified_gmt":"2025-08-05T06:09:26","slug":"how-to-use-subprocess-popen-to-get-the-return-value-in-python","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-use-subprocess-popen-to-get-the-return-value-in-python\/","title":{"rendered":"Python subprocess.Popen Return Value"},"content":{"rendered":"<p>To obtain the return value using subprocess.Popen, you can use the communicate() method. Here is an example:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> subprocess\r\n\r\n<span class=\"hljs-comment\"># \u6267\u884c\u547d\u4ee4<\/span>\r\nprocess = subprocess.Popen([<span class=\"hljs-string\">'ls'<\/span>, <span class=\"hljs-string\">'-l'<\/span>], stdout=subprocess.PIPE)\r\n\r\n<span class=\"hljs-comment\"># \u83b7\u53d6\u547d\u4ee4\u6267\u884c\u7ed3\u679c<\/span>\r\noutput, error = process.communicate()\r\n\r\n<span class=\"hljs-comment\"># \u6253\u5370\u7ed3\u679c<\/span>\r\n<span class=\"hljs-built_in\">print<\/span>(output.decode(<span class=\"hljs-string\">'utf-8'<\/span>))\r\n<\/code><\/pre>\n<p>In the example above, subprocess.Popen is used to execute the command &#8220;ls -l&#8221; and pass the result through the stdout parameter to subprocess.PIPE, meaning the output of the command will be captured.<\/p>\n<p>Next, use the process.communicate() method to retrieve the output and error information of the command (if any). The communicate() method will block until the command is executed.<\/p>\n<p>Lastly, use the print() function to display the command&#8217;s output. It is important to note that the output is a byte string, and if you want to convert it to a text string, you can use the .decode(&#8216;utf-8&#8217;) method.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>To obtain the return value using subprocess.Popen, you can use the communicate() method. Here is an example: import subprocess # \u6267\u884c\u547d\u4ee4 process = subprocess.Popen([&#8216;ls&#8217;, &#8216;-l&#8217;], stdout=subprocess.PIPE) # \u83b7\u53d6\u547d\u4ee4\u6267\u884c\u7ed3\u679c output, error = process.communicate() # \u6253\u5370\u7ed3\u679c print(output.decode(&#8216;utf-8&#8217;)) In the example above, subprocess.Popen is used to execute the command &#8220;ls -l&#8221; and pass the result through the stdout [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[16752,72,8449,7779,16753],"class_list":["post-12739","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-popen","tag-python","tag-return-value","tag-subprocess","tag-system-command"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Python subprocess.Popen Return Value - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn how to capture Python subprocess return values using Popen(). 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