1.Document-introduction-to-subprocess.txt

import subprocess
sp=subprocess.Popen(cmd,shell=True/False,stdout=subprocess.PIPE,stderr=subprocess.PIPE,universal_newlines=True)
rc=sp.wait()
out,err=sp.communicate()
print(f'OUTPUT IS: {out}')
print(f'Error is: {err}')
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if shell=True then your cmd is a string (as your os command)
if shell=False then your cmd is a list

Note: shell=False dont work on your os environment variables
      
ex: cmd="ls -lrt" ==>shell=True
    shell=False ==> cmd="ls -lrt".split()  or ['ls','-lrt']
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shell=True always on windows
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cmd is a string
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