human
Complete this python program:
def literal_stringizer(value):
assistant
#Here is the Python code you requested.

    """Convert a `value` to a Python literal in GML representation.
    Parameters
    value : object
    The `value` to be converted to GML representation.
    Returns
    rep : string
    A double-quoted Python literal representing value. Unprintable
    characters are replaced by XML character references.
    Raises
    ValueError
    If `value` cannot be converted to GML.
    Notes
    `literal_stringizer` is largely the same as `repr` in terms of
    functionality but attempts prefix `unicode` and `bytes` literals with
    `u` and `b` to provide better interoperability of data generated by
    Python 2 and Python 3.
    The original value can be recovered using the
    :func:`networkx.readwrite.gml.literal_destringizer` function.
    """
    def stringize(value):
        if (isinstance(value, (int, long, bool)) or (value is None)):
            if (value is True):
                buf.write(str(1))
            elif (value is False):
                buf.write(str(0))
            else:
                buf.write(str(value))
        elif isinstance(value, unicode):
            text = repr(value)
            if (text[0] != 'u'):
                try:
                    value.encode('latin1')
                except UnicodeEncodeError:
                    text = ('u' + text)
            buf.write(text)
        elif isinstance(value, (float, complex, str, bytes)):
            buf.write(repr(value))
        elif isinstance(value, list):
            buf.write('[')
            first = True
            for item in value:
                if (not first):
                    buf.write(',')
                else:
                    first = False
                stringize(item)
            buf.write(']')
        elif isinstance(value, tuple):
            if (len(value) > 1):
                buf.write('(')
                first = True
                for item in value:
                    if (not first):
                        buf.write(',')
                    else:
                        first = False
                    stringize(item)
                buf.write(')')
            elif value:
                buf.write('(')
                stringize(value[0])
                buf.write(',)')
            else:
                buf.write('()')
        elif isinstance(value, dict):
            buf.write('{')
            first = True
            for (key, value) in value.items():
                if (not first):
                    buf.write(',')
                else:
                    first = False
                stringize(key)
                buf.write(':')
                stringize(value)
            buf.write('}')
        elif isinstance(value, set):
            buf.write('{')
            first = True
            for item in value:
                if (not...