def fundamentalaNyckeltal(param):
    fundamentalaNyckeltalRoot = Tk()
    f = open("fundameta.txt", "r")
    if param == "1":
        f_contents = f.read(16)
    if param == "2":
        f_contents = f.read(16: 32) #from 16 to 32
    f.close()

f_contents = f.read(16: 32) #from 16 to 32

f.seek(16)              # go to position 16
f_contents = f.read(16) # read 16 bytes (from position 16), i. e. bytes 16 to 31