python - Best way to pipe output of Linux sort -

i process file line line. need sort first piping:

sort --key=1,2 data |./script.py.   

what's best call sort within python? searching online see subprocess or sh module might possibilities? don't want read file memory , sort in python data big.

its easy. use subprocess.popen run sort , read stdout data.

import subprocess myfile = 'data' sort = subprocess.popen(['sort', '--key=1,2', myfile],     stdout=subprocess.pipe) line in sort.stdout:     your_code_here sort.wait() assert sort.returncode == 0, 'sort failed'