Help me solve the code #0004

Question

https://code.sololearn.com/cz3m4k83jOuj/?ref=app

it gives output 1.
i don't know how..?

Answer 1

frac = Fraction (1,3) ----> frac = 1/3

frac += Fraction (1,2) ----> frac = frac + 1/2 = 1/3 + 1/2 = 5/6

frac += Fraction (1,6) ----> frac = frac + 1/6 = 5/3 + 1/6 = 6/6 =1

Answer 2

this docstring (coment)