python - String comparing between output system command with defined variable -

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i tried compare output of command line variable that's defined logic throw false instead of true.

$ sudo hdparm -i /dev/sda | grep serial | awk '{print $3}' 6ra3x34p

in python:

hdserial="6ra3x34p" cmd1="sudo hdparm -i /dev/sda | grep serial | awk '{print $3}'"  output = subprocess.check_output(cmd1, shell=true)  def check_serial(string):     if string != hdserial:         print '\nquitting..'         sys.exit()  check_serial(output)

why comparison failing?

the output of command contains trailing newline. should remove using str.strip or str.rstrip:

output = subprocess.check_output(cmd1, shell=true).strip()

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