How do you get the total size of a torrent in libtorrent?

How do you get the total size of the files in a torrent?

And is there any way to get the number of files in a torrent and the size of each one?

Using torrent_parser:

import torrent_parser as tp

torrent_metadata = tp.parse_torrent_file("file.torrent")
totalsize = 0

for file in torrent_metadata['info']['files']:
    totalsize += file['length']

print(totalsize)