Python subprocess.Popen Return Value

To obtain the return value using subprocess.Popen, you can use the communicate() method. Here is an example:

import subprocess

# 执行命令
process = subprocess.Popen(['ls', '-l'], stdout=subprocess.PIPE)

# 获取命令执行结果
output, error = process.communicate()

# 打印结果
print(output.decode('utf-8'))

In the example above, subprocess.Popen is used to execute the command “ls -l” and pass the result through the stdout parameter to subprocess.PIPE, meaning the output of the command will be captured.

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.

Lastly, use the print() function to display the command’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(‘utf-8’) method.