python - Python2 grep command with pipes -

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i need identify environment variable in following script.

env | grep -i timezone | cut -c14-18

what doing wrong? tried:

command = ['env'] command2 = ['grep'] command2.append('-i') command2.append('timezone') command3 = ['cut'] command3.append('-c14-18')  process=subprocess.popen(command,stdout=subprocess.pipe,shell=true)  process2=subprocess.popen(command2,stdin=process.stdout,stdout=subprocess.pipe) process3=subprocess.popen(command3,stdin=process2.stdout,stdout=subprocess.pipe) (out,err) = process3.communicate() print 'output :', out


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