how to print stdout while processing the execution in python

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1from subprocess import Popen, PIPE, CalledProcessError
2
3with Popen(cmd, stdout=PIPE, bufsize=1, universal_newlines=True) as p:
4    for b in p.stdout:
5        print(b, end='') # b is the byte from stdout
6
7if p.returncode != 0:
8    raise CalledProcessError(p.returncode, p.args)

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