python subprocess run
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in python, the subprocess module provides a powerful and flexible way to spawn new processes, connect to their input/output/error pipes, and obtain their return codes. the subprocess.run() function, introduced in python 3.5, is a high-level interface that simplifies subprocess management.
in this tutorial, we will explore the subprocess.run() function and its various features with code examples.
the most straightforward use of subprocess.run() involves running a command and waiting for it to complete. here's a simple example:
in this example, we run the echo command with the argument "hello, subprocess!" and capture its output. the capture_output=true parameter ensures that the standard output is captured, and text=true specifies that the output should be returned as a string.
you can also provide input to the subprocess using the input parameter:
in this example, we use the grep command to search for the word "subprocess" in the provided input data.
to check for errors in the subprocess, you can inspect the return code and the standard error output:
here, we attempt to list the contents of a nonexistent directory, and the error message is captured in the stderr attribute.
by default, subprocess.run() executes commands directly without going through a shell. if you need shell features (like wildcard expansion or variable substitution), you can use the shell=true parameter:
in this example, we use the shell to expand the $home environment variable.
you can set a timeout for the subprocess using the timeout parameter:
in this example, the sleep command is given a timeout of 3 seconds, causing a timeoutexpired exception to be raised.
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