python wait for command to finish
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title: python: waiting for a command to finish - a tutorial
introduction:
in python, there are times when you need to execute external commands or processes and wait for them to complete before proceeding with the rest of your code. this tutorial will guide you through the process of executing a command and waiting for it to finish using the subprocess module in python.
step 1: import the subprocess module
firstly, you need to import the subprocess module, which allows you to spawn new processes, connect to their input/output/error pipes, and obtain their return codes.
step 2: execute a command and wait for it to finish
to execute an external command and wait for it to finish, you can use the subprocess.run() function. this function takes a list containing the command and its arguments as its first argument. here's an example:
in this example, the ls -l command is executed, and the check=true parameter ensures that a calledprocesserror exception is raised if the command returns a non-zero exit code. you can adjust the command and arguments based on your specific use case.
step 3: capture the output of the command
if you want to capture the output of the executed command, you can use the subprocess.pipe option for the stdout and stderr parameters. here's an example:
in this example, the stdout and stderr parameters are set to subprocess.pipe to capture the standard output and error of the command, respectively. the text=true parameter ensures that the output is returned as a string.
conclusion:
by using the subprocess module in python
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#python #python #python #python #python
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