b = b"Hello, world!"  # bytes object

s = "Hello, world!"   # str object 

print('str --> bytes')

print(bytes(s, encoding="utf8"))

print(str.encode(s))   # 默认 encoding="utf-8"

print(s.encode())      # 默认 encoding="utf-8"

print('\nbytes --> str')

print(str(b, encoding="utf-8"))

print(bytes.decode(b))  # 默认 encoding="utf-8"

print(b.decode())       # 默认 encoding="utf-8"