yearning and earning...Python

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

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

pwm1b = Pwm('/dev/bone/pwm/1/b/', frequency=50, value=0)

GPIO  = Path('/sys/class/gpio/gpio48/direction')
GPIO.write_text('out')
GPIO  = Path('/sys/class/gpio/gpio48/value')
GPIO.write_text('0')

GPIO1 = Path('/sys/class/gpio/gpio26/direction')
GPIO1.write_text('out')
GPIO1 = Path('/sys/class/gpio/gpio26/value')
GPIO1.write_text('0')

# https://pastebin.com/R70P1wAn

# initialize and enable pwm, automatically disable when scope is left
#with Pwm('/dev/bone/pwm/1/b', frequency=20000, value=0) as pwm:
#    while True:
#        pwm.value = float(input("Enter PWM value (between 0.0 and 1.0): "))

try:
    while True:
        port = int(input("Please type 0 or 1 : "))
        if port == 0:
            GPIO.write_text('1')
            pwm1b.frequency=50
            pwm1b.value=0.2
            sleep(1)
        elif port == 1:
            GPIO.write_text('1')
            pwm1b.frequency=50
            pwm1b.value=0.3
            sleep(1)

except KeyboardInterrupt:
    GPIO.write_text("0")
    GPIO1.write_text("0")
    pwm1b.enabled = False
    print("Kosher Salt!")

and...The file in question, i.e. (TB6600_PWM.py)

debian@BeagleBone:~/Ball_Screw/Third$ ./TB6600_PWM.py
Please type 0 or 1 : 1
Please type 0 or 1 : 0
Traceback (most recent call last):
  File "/home/debian/Ball_Screw/Third/./TB6600_PWM.py", line 33, in <module>
    pwm1b.frequency=50
  File "/home/debian/Ball_Screw/Third/sysfs_pwm.py", line 144, in frequency
    raise RuntimeError("Cannot set frequency when PWM value is non-zero (i.e. duty_cycle is non-zero)")
RuntimeError: Cannot set frequency when PWM value is non-zero (i.e. duty_cycle is non-zero)