记的一点笔记，希望有所帮助：

# string to bytes, then to numbers
s = '你好'
list(bytes(s,encoding='utf8'))
Output：[228, 189, 160, 229, 165, 189]

# string to bytes then to string
bytes(s,encoding='utf8').decode('utf8')
Output：'你好'

# list numbers to bytes then to string
bytes([228, 189, 160, 229, 165, 189]).decode('utf8')
Output：'你好'

# str
s = 'hello'

# bytes
b = b'hello'

# ok
s + s

# error
try:
s + b
except TypeError:
print('发生错误')
Output：发生错误