There's a reason we're telling you to use libsodium box instead: even if pyrsa sets a reasonable exponent, for example, it's still a separate pure Python implem

There's a reason we're telling you to use libsodium box instead: even if pyrsa sets a reasonable exponent, for example, it's still a separate pure Python implementation (with fewer eyeballs and almost certainly more side channel vulnerabilities), and still uses PKCSv15, exposing you to Bb98-style padding oracle attacks.