Answer
The third line in the script should be:
days_per_year = days_per_week * weeks_per_year
Work Step by Step
The problem in the script is that the '**' operator is used in exponentiation and so the result value of the days_per_year was $7^{52}$.
We want to multiply days_per_week and weeks_per_year and for that a '*' operator is used.
