```py
import argparse

parser = argparse.ArgumentParser(prog = "Salary Calculator")
parser.add_argument('--salary', type=float)
args = parser.parse_args()

monthly_salary = args.salary
yearly_salary =  monthly_salary * 12

print(yearly_salary)
```
```py
import argparse

parser = argparse.ArgumentParser(prog = "Salary Calculator")
parser.add_argument('--salary', type=float)
args = parser.parse_args()

monthly_salary = args.salary
yearly_salary =  monthly_salary * 12

print(yearly_salary)
```