TypeError: string argument without an encoding

Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/pyghmi/ipmi/oem/lenovo/energy.py", line 30, in __init__
    data=self.iana + b'\x00\x00\x01')
  File "/usr/local/lib/python3.6/site-packages/pyghmi/ipmi/command.py", line 459, in xraw_command
    raise exc.IpmiException(rsp['error'], rsp['code'])
pyghmi.exceptions.IpmiException: Invalid command

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "./ipmi_sensors_discovery.py", line 54, in <module>
    print(*sensors_descriptions, sep='\n')
  File "/usr/local/lib/python3.6/site-packages/pyghmi/ipmi/command.py", line 990, in get_sensor_descriptions
    for sensor in self._oem.get_sensor_descriptions():
  File "/usr/local/lib/python3.6/site-packages/pyghmi/ipmi/oem/lenovo/handler.py", line 421, in get_sensor_descriptions
    return self.immhandler.get_oem_sensor_descriptions(self.ipmicmd)
  File "/usr/local/lib/python3.6/site-packages/pyghmi/ipmi/oem/lenovo/imm.py", line 628, in get_oem_sensor_descriptions
    } for x in self.get_oem_sensor_names(ipmicmd)]
  File "/usr/local/lib/python3.6/site-packages/pyghmi/ipmi/oem/lenovo/imm.py", line 621, in get_oem_sensor_names
    self._energymanager = energy.EnergyManager(ipmicmd)
  File "/usr/local/lib/python3.6/site-packages/pyghmi/ipmi/oem/lenovo/energy.py", line 33, in __init__
    self.iana = bytearray('\x4d\x4f\x00')
TypeError: string argument without an encoding

--- energy.py 2020-03-25 12:28:56.840767989 +0300
+++ energy-fix.py 2020-03-25 12:29:39.569242159 +0300
@@ -30,9 +30,9 @@
                                        data=self.iana + b'\x00\x00\x01')
         except pygexc.IpmiException as ie:
             if ie.ipmicode == 193: # try again with IBM IANA
- self.iana = bytearray('\x4d\x4f\x00')
+ self.iana = bytearray(b'\x4d\x4f\x00')
                 rsp = ipmicmd.xraw_command(netfn=0x2e, command=0x82,
- data=self.iana + '\x00\x00\x01')
+ data=self.iana + b'\x00\x00\x01')
             else:
                 raise
         if rsp['data'][4:6] not in (b'\x02\x01', b'\x02\x06', b'\x02\x09'):