figuring out what does what in GPIO/PWM

#!/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
import gpiod
import os

CHIP = 'gpiochip1'
LINE_OFFSET = [28]

CHIP1 = 'gpiochip1'
LINE_OFFSET1 = [18]

chip = gpiod.Chip(CHIP)
chip1 = gpiod.Chip(CHIP1)

lines = chip.get_lines(LINE_OFFSET)
lines.request(consumer=' ', type=gpiod.LINE_REQ_DIR_OUT)

lines1 = chip.get_lines(LINE_OFFSET1)
lines1.request(consumer=' ', type=gpiod.LINE_REQ_DIR_IN)

lines.set_values([0])
#lines1.set_values([0])

try:
    port = int(input("Please type 0 or 1 : "))
    if port == 0:
        lines.set_values([0])
        pwm1b = Pwm('/dev/bone/pwm/1/b/', frequency=2000)
        pwm1b.value = 0.5
        sleep(1)
        lines.set_values([1])
        sleep(5)
    elif port == 1:
        lines1.set_values([0])
        pwm1b = Pwm('/dev/bone/pwm/1/b/', frequency=0)
        pwm1b.value = 0.0
        sleep(1)
        lines1.set_values([1])
        sleep(1)

except KeyboardInterrupt:
    lines.set_values([0])
    lines1.set_values([0])
    pwm1b = Pwm('/dev/bone/pwm/1/b', frequency=0)
    pwm1b.value = 0.0
    print("Kosher Salt!")