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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 sf(f, dirpath, jottapath):
 """Create and return a SyncFile tuple from filename. localpath will be a byte string with utf8 code points jottapath will be a unicode string"""

    log.debug('Create SyncFile from %s', repr(f))
    log.debug('Got encoded filename %r, joining with dirpath %r', _encode_filename_to_filesystem(f), dirpath)
    return SyncFile(localpath=os.path.join(dirpath, _encode_filename_to_filesystem(f)),
                  jottapath=posixpath.join(_decode_filename_to_unicode(jottapath), _decode_filename_to_unicode(f)))