_scrub_hostname.py

    def _maketrans(self, replace_chars, replacement_chars, delete_chars):
        if PY3:
            return str.maketrans(replace_chars, replacement_chars, delete_chars)

        if not isinstance(replace_chars, text_type) or not isinstance(replacement_chars, text_type):
            raise ValueError('replace_chars and replacement_chars must both be strings')
        if len(replace_chars) != len(replacement_chars):
            raise ValueError('replacement_chars must be the same length as replace_chars')

        table = dict(zip((ord(c) for c in replace_chars), replacement_chars))
        for char in delete_chars:
            table[ord(char)] = None

        return table

    def _scrub_hostname(self, name):
        """LocalHostName only accepts valid DNS characters while HostName and ComputerName
        accept a much wider range of characters. This functions aims to mimic how macOS
        translates a friendly name to the LocalHostName.
        """

        # Replace all these characters with a single dash
        name = to_text(name)
        replace_chars = '\'"~`!@#$%^&*(){}[]/=?+\\|-_ '
        delete_chars = ".'"
        table = self._maketrans(replace_chars, '-' * len(replace_chars), delete_chars)
        name = name.translate(table)

        # Replace multiple dashes with a single dash
        while '-' * 2 in name:
            name = name.replace('-' * 2, '')

        name = name.rstrip('-')
        return name