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# tested on python 3.6
from typing import NamedTuple

class T(NamedTuple):
  a: int
  b: str

if __name__=='__main__':
  
  # define a named tuple object

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import sys
import glob
import serial


def serial_ports():
    """ Lists serial port names

        :raises EnvironmentError:
            On unsupported or unknown platforms