<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def file_to_attachment(filename, filehandler=None):
 """ Convert a file to attachment """

    if filehandler:
        return {'_name': filename,
                'content': base64.b64encode(filehandler.read())
        }
    with open(filename, 'rb') as _file:
        return {'_name': filename,
                'content': base64.b64encode(_file.read())
        }