How to generate Zcash address and private key by a mnemonic seed, in nodejs or python? Is there some lib like bitcore-lib or ethereum-bip44?
Zcash transparent addresses can be generated in the usual BIP 44 way. There is a Zcash
coin_type defined in SLIP 44, which can be used with any standard Bitcoin library. The resulting transparent addresses just need to be re-encoded with the Zcash transparent address prefix for mainnet.
There is currently no library for generating Zcash shielded addresses deterministically. We are working on ZIP 32 which will define how to generate Sprout and Sapling shielded addresses from a seed. In practice, this will be the same seed used for transparent addresses.