>>> 1+2
3
>>> 3*_
9
>>> _
9
>>> print(3)
3
>>> _
9
>>> 'a'+'b'
'ab'
>>> _
'ab'
>>> 'a' in 'ab'
True
>>> _
True
>>> 'addd'
'addd'
>>> _
'addd'
Note that the need is the result of the calculation , Whether it is numerical calculation or logical calculation , The value itself can , But it can't be print The value of .
