Binary operations with Python

binary.py

def bitrepresent(dec):
    base, exp = 2, 7
    power = base ** exp
    str = ""
    
    while power != 0:
        if power <= dec:
            str += "1"
            dec -= power
        else:
            str += "0"
        power = power // 2
    return str

def showBin(dec):
    byte1 = 0
    byte2 = 0
    buf = ""

    if dec > 255:
        byte2 = dec // 256
        byte1 = dec - byte2 * 256
        buf = bitrepresent(byte2) + " " + bitrepresent(byte1)
    else:
        byte1 = dec
        buf = bitrepresent(byte2) + " " + bitrepresent(byte1)
    return buf

print(showBin(3))
# -> 00000000 00000011
print(showBin(256*128))
# -> 10000000 00000000
print(showBin(1))
# -> 00000000 00000001
print(showBin(128))
# -> 00000000 10000000