I guess?

#!/usr/bin/python3

# Use for PWM on /dev/bone/pwm/

from pathlib import Path
from NewMotor_TB6600 import Pwm  # see https://pastebin.com/R70P1wAn
from time import sleep

GPIO = Path('/sys/class/gpio/gpio60/direction')
GPIO.write_text("out")

GPIO = Path('/sys/class/gpio/gpio60/value')
GPIO.write_text("0")

pwm1b = Pwm('/dev/bone/pwm/1/b/')
pwm1a = Pwm('/dev/bone/pwm/1/a/')

try:
    while True:
        port = int(input("Please type 0 or 1 : "))
        if port == 0:
            GPIO.write_text("1")
            pwm1a.frequency = 2000
#            pwm1a.enabled = True
            pwm1a.value = 0.5
            sleep(4)
        elif port == 1:
            GPIO.write_text("1")
            pwm1b.frequency = 2000
#            pwm1b.enabled = True
            pwm1b.value = 0.5
            sleep(4)

except KeyboardInterrupt:
    pwm1b.enabled = False
    pwm1a.enabled = False
    print("Kosher Salt!")