Bitcoin -> Litecoin address conversions using https://github.com/vbuterin/pybitcointools

gistfile1.txt

from bitcoin import *

# private key conversion
privkey = "L2Gkw3kKJ6N24QcDuH4XDqt9cTqsKTVNDGz1CRZhk9cq4auDUbJy"
encode_privkey(privkey, get_privkey_format(privkey), 48)
# testnet
encode_privkey(privkey, get_privkey_format(privkey), 111)


# public key conversion
pubkey = "1AGNa15ZQXAZUgFiqJ2i7Z2DPU2J6hW62i"
bin_to_b58check(b58check_to_bin(pubkey), 48)


# bip32 conversions
MAINNET_PRIVATE = b'\x01\x9D\x9C\xFE'
MAINNET_PUBLIC = b'\x01\x9D\xA4\x62'
TESTNET_PRIVATE = b'\x04\x36\xEF\x7D'
TESTNET_PUBLIC = b'\x04\x36\xF6\xE1'

data = "tpubD6NzVbkrYhZ4WZaiWHz59q5EQ61bd6dUYfU4ggRWAtNAyyYRNWT6ktJ7UHJEXURvTfTfskFQmK7Ff4FRkiRN5wQH8nkGAb6aKB4Yyeqsw5m"
dbin = changebase(data, 58, 256)
if from_byte_to_int(dbin[3]) == 228:
  bindata = MAINNET_PRIVATE + dbin[4:-4]
elif from_byte_to_int(dbin[3]) == 30:
  bindata = MAINNET_PUBLIC + dbin[4:-4]
elif from_byte_to_int(dbin[3]) == 148:
  bindata = TESTNET_PRIVATE + dbin[4:-4]
else:
  bindata = TESTNET_PUBLIC + dbin[4:-4]

changebase(bindata+bin_dbl_sha256(bindata)[:4], 256, 58)