human
Write me a the Python program you requested given the following:
Complete the below
def c2py(plural):

    ''''Gets a C expression as used in PO files for plural forms and returns a
    Python function that implements an equivalent expression.'
    '''
assistant
#Here is the Python program you requested.
    if (len(plural) > 1000):
        raise ValueError('plural    form    expression    is    too    long')
    try:
        (result, nexttok) = _parse(_tokenize(plural))
        if nexttok:
            raise _error(nexttok)
        depth = 0
        for c in result:
            if (c == '('):
                depth += 1
                if (depth > 20):
                    raise ValueError('plural    form    expression    is    too    complex')
            elif (c == ')'):
                depth -= 1
        ns = {'_as_int': _as_int}
        exec ('if    1:\n                                                def    func(n):\n                                                                if    not    isinstance(n,    int):\n                                                                                n    =    _as_int(n)\n                                                                return    int(%s)\n                                                ' % result) in ns
        return ns['func']
    except RuntimeError:
        raise ValueError('plural    form    expression    is    too    complex')