What you shared is not valid python code. Here is an example of code that will accomplish what you are asking:
# define function:
def CalculateMortgage(p, i, n):
    # calculate numerator:
    numerator = p * (i *(1+i) ** n)
    # calculate denominator:
    denominator = ((1+i) ** n - 1)
    # calculate mortgage:
    mortgage = numerator/denominator 
    # return result:
    return mortgage
# set variables:
p = 1
i = 1
n = 1
# call function:
mortgage = CalculateMortgage(p, i, n)
# print result:
print('Your mortgage is: ' + str(mortgage))
solved python not understanding simple math question [closed]