syntax error ?

[lzahradil]

root@rpi-solar:/home/pi/test/SolarShed# ./getChargeryData.py
File "./getChargeryData.py", line 71
dataStr = f"BMS_A{valName} {cellVolts}"
^
SyntaxError: invalid syntax

[BarkinSpider]

Indentation problem causing error?
Code looks good...

[ticktoo]

Same here.

./RenogyWanderer.py 
  File "./RenogyWanderer.py", line 79
    dataStr  = f"Renogy{valName} {float(register)}"
                                                  ^
SyntaxError: invalid syntax