send file to serial port in python - xmodem

Question

i am trying to send the file below '105.8k' to my energy meter.
i am using the xmodem example from pypi but i get the following error:
Traceback (most recent call last):
File "C:\Py\mainpy.py", line 68, in <module>
status = modem.send(f, retry=3)
File "C:\Users\admin\AppData\Local\Programs\Python\Python38-32\lib\site-packages\xmodem\__init__.py", line 270, in send
char = self.getc(1)
File "C:\py\mainpy.py", line 62, in getc
return ser.read(size) or None
AttributeError: 'str' object has no attribute 'read'
the code i use:
### send file to port###
ser = serialPortCombobox.get().split(" ")[0]
def getc(size, timeout=1):
return ser.read(size) or None
def putc(data, timeout=1):
return ser.write(data)
modem = XMODEM(getc, putc)
f = open('105.8k', 'rb')
status = modem.send(f, retry=3)
ser.close()
stream.close()
thank you for your help.