What does + _ mean in python [duplicate]

Question

This question already has answers here:

Is the single underscore "_" a built-in variable in Python? (3 answers)

Closed 9 years ago.

In python docs

>>> tax = 12.5 / 100
>>> price = 100.50
>>> price * tax
12.5625
>>> price + _
113.0625
>>> round(_, 2)
113.06

I don't understand what does this mean

>>> price + _

and how does it work

Answer 1

_ means the last result when you are working on python console