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/usr/bin/mido3-ports is in python3-mido 1.2.7-2.

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The actual contents of the file can be viewed below.

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#!/usr/bin/python3
"""
List available PortMidi ports.
"""

from __future__ import print_function
import os
import sys
import mido

def print_ports(heading, port_names):
    print(heading)
    for name in port_names:
        print("    '{}'".format(name))
    print()

print()
print_ports('Available input Ports:', mido.get_input_names())
print_ports('Available output Ports:', mido.get_output_names())

for name in ['MIDO_DEAFULT_INPUT',
             'MIDO_DEFAULT_OUTPUT',
             'MIDO_DEFAULT_IOPORT',
             'MIDO_BACKEND']:
    try:
        value = os.environ[name]
        print('{}={!r}'.format(name, value))
    except LookupError:
        print('{} not set.'.format(name))
print()
print('Using backend {}.'.format(mido.backend.name))
print()