Backport of builtin function bin() for python 2.4

I wrote a program that uses builtin function bin(), but this function is new in Python version 2.6 开发者_JS百科and I would like to run this application also in Python versions 2.4 and 2.5.

Is there some backport of bin() for 2.4?

You can try this version (credit goes to the original author):

def bin(x):
    """
    bin(number) -> string

    Stringifies an int or long in base 2.
    """
    if x < 0: 
        return '-' + bin(-x)
    out = []
    if x == 0: 
        out.append('0')
    while x > 0:
        out.append('01'[x & 1])
        x >>= 1
        pass
    try: 
        return '0b' + ''.join(reversed(out))
    except NameError, ne2: 
        out.reverse()
    return '0b' + ''.join(out)