>>> s = '开始'
>>> print(s)
开始
>>> print(s.encode('unicode-escape'))
b'\u5f00\u59cb'
>>> print(str(s.encode('unicode-escape'), encoding='utf-8'))
u5f00u59cb
参考:牛啊!

>>> s = '开始'
>>> print(s)
开始
>>> print(s.encode('unicode-escape'))
b'\u5f00\u59cb'
>>> print(str(s.encode('unicode-escape'), encoding='utf-8'))
u5f00u59cb
参考:牛啊!