I am reading a value from a device over serial, and the return value has the format:

[Theoretical position in mm, Encoder position in mm], for example, b'\r#-0.001504,-0.001516\n'

I would like to format this return value and save the second value into an array. Does anyone have an idea how I might do this? Any suggestions are much appreciated.

Thanks.

New edit: This is my code and output. At this point I only need to extract the float value from this string.

    ser.write(b'1POS?\r') #command to query positionpos = ser.readline() #read the positionpos_str = str(pos)pos_splt = pos_str.split(",") enc_pos = pos_splt[1]print(enc_pos)

Output: "-0.028970\n'"

Ok, sorry, I've just realised what your: error "a bytes-like object is required, not 'str'" means.

Its because what you are trying to split is a bytes array, which, although it has a split() method, its requires a bytes array as the parameter.

Try this now:

pos = b'\r#-0.001504,-0.001516\n'   # Sample data from serial portpos_splt = pos.strip().split(b",")  # the param b"," is the bytes version of ","
enc_pos = pos_splt[1]
print(float(enc_pos))

Output

-0.001516