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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 reload(self):
 """ Reload a ConfigObj from file. This method raises a ``ReloadError`` if the ConfigObj doesn't have a filename attribute pointing to a file. """

        if not isinstance(self.filename, string_types):
            raise ReloadError()

        filename = self.filename
        current_options = {}
        for entry in OPTION_DEFAULTS:
            if entry == 'configspec':
                continue
            current_options[entry] = getattr(self, entry)

        configspec = self._original_configspec
        current_options['configspec'] = configspec

        self.clear()
        self._initialise(current_options)
        self._load(filename, configspec)