python 문자열str와 바이트 그룹 상호전환

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

print('str --> bytes')
print(bytes(s, encoding="utf8"))    
print(str.encode(s))   #   encoding="utf-8"
print(s.encode())      #   encoding="utf-8"

print('
bytes --> str')
print(str(b, encoding="utf-8"))   
print(bytes.decode(b))  #   encoding="utf-8"
print(b.decode())       #   encoding="utf-8"