human
Solve the following python programming problem given the following code:
def ex_take_node_screenshot(self, node, directory, screen = 0) : 
    '
        Take a screenshot of a monitoring of a running instance.

        :param node: Node to take the screenshot of.
        :type node: :class:`libcloud.compute.base.Node`

        :param directory: Path where the screenshot will be saved.
        :type directory: ``str``

        :param screen: ID of the monitor to take the screenshot of.
        :type screen: ``int``

        :return: Full path where the screenshot has been saved.
        :rtype: ``str``
        ' 
    if ((not os.path.exists (directory)) or (not os.path.isdir (directory))) : 
        raise ValueError ('Invalid value for directory argument') 
domain = self._get_domain_for_node (node = node) 
    stream = self.connection.newStream () 
    mime_type = domain.screenshot (stream = stream, screen = 0) 
    extensions = mimetypes.guess_all_extensions (type = mime_type) 
    if extensions : 
        extension = extensions [0] 
else : 
        extension = '.png' 
name = ('screenshot-%s%s' % (int (time.time ()), mime_type)) 
    file_path = pjoin (directory, name) 
    with open (file_path, 'wb') as fp : 
        def write(stream, buf, opaque) : 
            fp.write (buf) 
stream.recvAll (write, None) 
try : 
        stream.finish () 
except Exception : 
        pass 
return file_path 

    
    

    Fix the buggy line: name = ('screenshot-%s%s' % (int (time.time ()), mime_type))
assistant
#Here is Python program to fix the buggy line: name = ('screenshot-%s%s' % (int (time.

name = ('screenshot-%s%s' % (int (time.time ()), extension))