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[buran]

Hi, First of all let's look at GetMonths function. You don't need to supply Months as argument. You just need Years and then return calculated Months.
Now the error - the error comes because at the time of the function call name Months does not exists.

def get_months(years):
    months = years * 12 
    return months

most people would simply:

def get_months(years):
    return years * 12

and call it (e.g. print the result) like this:

print(get_months(25))

as a general note - take a look at PEP-8 - the styling guide, naming conventions, etc.