py func code snippet

gistfile1.py

def select_entry(seq, question):
    for entry in seq:
        print '%d) %s' % ((1 + seq.index(entry)), entry)

    return input(question) - 1

def remove_duplicate(seq):
    seen = set()
    seen_add = seen.add
    return [x for x in seq if x not in seen and not seen_add(x)]

def list_optargs(option, opt, value, parser):
    """ Turns an option arguments string into a list.
        
        This function is an optparse callback function
        to return a list of option argument values
        passed as comma-separated string like "aaa, bbb".

        Sample parser.add_options setting to use this callback:
        parser.add_options('-s', '--sample', type='string', action='callback', callback=list_optargs, dest='sample', help='just a sample')

    """
    value = re.sub(r'\s+', '', value)
    setattr(parser.values, option.dest, value.split(','))

def get_binary_string(n):
    """
    returns binary string representation of a given number
    """
    r = ''
    p = 0
    pp = 1
    
    while n >= pp:
        if n & pp:
            r += '1'
        else:
            r += '0'
        p += 1
        pp = 2 ** p
    return r[::-1]