Python Question

Consider a simple game where the player starts with $1 and, at each turn, can choose to either:
1. Double her money, or
2. Add $1 to her total
Write a function named double_or_1 that accepts one argument (a whole dollar amount, such as $500) and returns the minimum number of turns required to obtain exactly that dollar amount. Here are some sample runs of the function:

In [1]: double_or_1(1)
Out[1]: 0

In [2]: double_or_1(2)
Out[2]: 1

In [3]: double_or_1(100)
Out[3]: 8

In [4]: double_or_1(500)
Out[4]: 13

Point of Stress: Please attach a print screen in addition to the codes as evidence that the scripts ran properly and as intended. Thanks.

It's basically a homework. I have taken time to go through the question and I can't see any missing details.