<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _parse_description(self, config):
 """Scans the specified config block and returns the description value Args: config (str):
 The interface config block to scan Returns: dict: Returns a dict object with the description value retrieved from the config block. If the description value is not configured, None is returned as the value. The returned dict is intended to be merged into the interface resource dict. """

        value = None
        match = re.search(r'description (.+)$', config, re.M)
        if match:
            value = match.group(1)
        return dict(description=value)