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['3', '80', '443', 'a2', 'a32', 'a222', 'b1', 'http', 'telnet', 'ZZZ']
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norm = lambda t: int(t) if t.isdigit() else t.lower()
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'''Finds parent process id for pid based on /proc/<pid>/stat. See
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'man 5 proc' for details.
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raise ValueError("pid must be an integer")