human
Complete this python program:
def c2py(plural):
assistant
#Here is the Python program you requested.

    """Gets a C expression as used in PO files for plural forms and returns a
    Python lambda function that implements an equivalent expression.
    """
    try:
        from cStringIO import StringIO
    except ImportError:
        from StringIO import StringIO
    import token, tokenize
    tokens = tokenize.generate_tokens(StringIO(plural).readline)
    try:
        danger = [x for x in tokens if ((x[0] == token.NAME) and (x[1] != 'n'))]
    except tokenize.TokenError:
        raise ValueError, 'plural    forms    expression    error,    maybe    unbalanced    parenthesis'
    else:
        if danger:
            raise ValueError, 'plural    forms    expression    could    be    dangerous'
    plural = plural.replace('&&', '    and    ')
    plural = plural.replace('||', '    or    ')
    expr = re.compile('\\!([^=])')
    plural = expr.sub('    not    \\1', plural)
    expr = re.compile('(.*?)\\?(.*?):(.*)')
    def repl(x):
        return ('test(%s,    %s,    %s)' % (x.group(1), x.group(2), expr.sub(repl, x.group(3))))
    stack = ['']
    for c in plural:
        if (c == '('):
            stack.append('')
        elif (c == ')'):
            if (len(stack) == 1):
                raise ValueError, 'unbalanced    parenthesis    in    plural    form'
            s = expr.sub(repl, stack.pop())
            stack[(-1)] += ('(%s)' % s)
        else:
            stack[(-1)] += c
    plural = expr.sub(repl, stack.pop())
    return eval(('lambda    n:    int(%s)' % plural))