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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def to_string(var, masked=None, decode_bytes='utf-8', maskFormat='', strFormat='{}', intFormat='{}', numFormat=DEFAULT_NUM_FORMAT, noneFormat='{!r}', otherFormat='{}'):
 """ Converts var to a python string or unicode string so Qt widgets can display them. If var consists of bytes, the decode_bytes is used to decode the bytes. If var consists of a numpy.str_, the result will be converted to a regular Python string. This is necessary to display the string in Qt widgets. For the possible format string (replacement fields) see: https://docs.python.org/3/library/string.html#format-string-syntax :param masked: if True, the element is masked. The maskFormat is used. :param decode_bytes': string containing the expected encoding when var is of type bytes :param strFormat' : new style format string used to format strings :param intFormat' : new style format string used to format integers :param numFormat' : new style format string used to format all numbers except integers. :param noneFormat': new style format string used to format Nones. :param maskFormat': override with this format used if masked is True. If the maskFormat is empty, the format is never overriden. :param otherFormat': new style format string used to format all other types """

    #logger.debug("to_string: {!r} ({})".format(var, type(var)))

    # Decode and select correct format specifier.
    if is_binary(var):
        fmt = strFormat
        try:
            decodedVar = var.decode(decode_bytes, 'replace')
        except LookupError as ex:
            # Add URL to exception message.
            raise LookupError("{}\n\nFor a list of encodings in Python see: {}"
                              .format(ex, URL_PYTHON_ENCODINGS_DOC))
    elif is_text(var):
        fmt = strFormat
        decodedVar = six.text_type(var)
    elif is_a_string(var):
        fmt = strFormat
        decodedVar = str(var)
    elif isinstance(var, numbers.Integral):
        fmt = intFormat
        decodedVar = var
    elif isinstance(var, numbers.Number):
        fmt = numFormat
        decodedVar = var
    elif var is None:
        fmt = noneFormat
        decodedVar = var
    else:
        fmt = otherFormat
        decodedVar = var

    if maskFormat != '{}':
        try:
            allMasked = all(masked)
        except TypeError as ex:
            allMasked = bool(masked)

        if allMasked:
            fmt = maskFormat

    try:
        result = fmt.format(decodedVar)
    except Exception:
        result = "Invalid format {!r} for: {!r}".format(fmt, decodedVar)

    #if masked:
    #    logger.debug("to_string (fmt={}): {!r} ({}) -> result = {!r}".format(maskFormat, var, type(var), result))

    return result