A home-made decimal-binary converter...

Dec_to_Binary.py

"""by Alfonso Diz-Lois"""

def Binary_from_decimal(number,bitcount=None):
    Binary=[]
    while number>1:
        if number%2==0:
            Binary.insert(0,0)
        if number%2==1:
            Binary.insert(0,1)
        number=number/2
    Binary.insert(0,1)
    if bitcount:
        dif=bitcount-len(Binary)
        if dif!=0:
            z=dif*[0]
            z.extend(Binary)
            Binary=z
    print Binary