python subprocess run vs check output

the subprocess module in python allows you to spawn new processes, connect to their input/output/error pipes, and obtain their return codes. two commonly used functions in this module are run() and check_output().
return value:
handling output:
error handling:

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#python check if variable exists
#python check if list is empty
#python check if file exists
#python check if directory exists
#python check type

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