can someone help me with the formula to use with python

Question

Function 6: Loan Pay-Off Period Calculator
Write a function pay_off_period(PV, PMT, i) that calculates the minimum number of years left until a loan is fully paid off, if:

the amount owned on the loan is currently equal to PV,
the loan is repaid at an amount, PMT at the END of every YEAR (with the first payment exactly 1 year from now),
at an interest rate of i% per year, compounded annually.

IMPORTANT:
Your function may not call any of the other functions you've defined in this project.

Just like in Function 4 and 5, calculate the loan as the present value of the future down-payments on the loan, discounted at an interest rate of i% per year. (Use the present value of an annuity formula, a.k.a. discounted cash flow valuation - https://www.investopedia.com/walkthrough/corporate-finance/3/discounted-cash-flow/introduction.aspx)

### START FUNCTION 6

def pay_off_period(PV, PMT, i):

# YOUR CODE HERE

return int(n)

### END FUNCTION 6
IMPORTANT:
Your function needs to return an int.

Make sure that the following tests all give a True result:

pay_off_period(1635153, 15000*12, 0.1045) == 30
pay_off_period(1578934, 15000*12, 0.1045) == 25

Answer 1

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And from your descriptions, in the same assignment, there are function 4 and function 5, which discount future values to present.
I assumed you have done those yourself and fully understood them.
Now, one of the way to do function 6 is to use if-else statements to compare the PV and present values of PMT.
If you don't understand the math, use while loop to compare year-by-year (But that's not what the description is restricting you)