Using brain key object you can get keys(private, public) in base58 and hex representations.
from echopy import Echo
echo = Echo()
brain_key = echo.brain_key()
private_key_base58 = brain_key.get_private_key_base58()
private_key_hex = brain_key.get_private_key_hex()
public_key_base58 = brain_key.get_public_key_base58()
public_key_hex = brain_key.get_public_key_hex()
from echopy import Echo
echo = Echo()
brain_key = echo.brain_key()
# set brain key(16 words) in string format separated by comma or space, or list of string
brain_key.brain_key = "<your brain key>"
from echopy import Echo
echo = Echo()
brain_key = echo.brain_key()
#... some code here
# Switch to another brain_key
brain_key = next(brain_key)