what to do if moudle not in pip3 only in pip2?

[korenron]

Ok
now I don't get this error

but when I try to run the code I get that somehting is wrong with the modem-cmd package

import time
import datetime
import serial
import pynmea2
from modemcmd import modemcmd
from modemcmd import ModemcmdException
from modemcmd import ModemcmdTimeoutException


ser = serial.Serial('/dev/ttyUSB1',9600,timeout = 0.5)
ModemInfo = '/dev/ttyUSB2'

try:
    result = modemcmd('/dev/ttyUSB2', 'AT+CSQ', 2)
except ModemcmdTimeoutException as e:
    print (e)
except ModemcmdException as e:
    print (e)

but I get this error:

Traceback (most recent call last):
  File "GetAllData_test.py", line 20, in <module>
    result = modemcmd('/dev/ttyUSB2', 'AT+CSQ', 2)
  File "/home/pi/.local/lib/python3.7/site-packages/modemcmd/__init__.py", line 26, in modemcmd
    serial.write(cmd)
  File "/usr/lib/python3/dist-packages/serial/serialposix.py", line 532, in write
    d = to_bytes(data)
  File "/usr/lib/python3/dist-packages/serial/serialutil.py", line 63, in to_bytes
    raise TypeError('unicode strings are not supported, please encode to bytes: {!r}'.format(seq))
TypeError: unicode strings are not supported, please encode to bytes: 'AT+CSQ\r'