只是把hacklog中的php代码用python改写了一下

def decode(str):
    codekey='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_-'
    bins=''
    res=''
    for i in range(len(str)):
        curpos=codekey.find(str[i])
        bin6=('000000'+bin(curpos)[2:])[-6:]
        bins+=bin6

    for i in range(0,len(bins),8):
        bin8=bins[i:i+8]
        res+='%c' % int(bin8,2)

    return res

if __name__ == '__main__':
    while True:
        src=raw_input('code:\n')
        print 'decode:'
        print decode(src)