FAQ: Introduction to Functions - Multiple Parameters

This community-built FAQ covers the “Multiple Parameters” exercise from the lesson “Introduction to Functions”.

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FAQs on the exercise Multiple Parameters

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In case anyone else gets confused here. In the lesson it teaches to define a function we type
def function_name(parameter1, parameter2, parameter 3)
when running this you will run into a syntax error. simply retype to match this
def function_name(parameter1, parameter2, parameter 3):
not having the colon will cause a syntax error to appear

1 Like

I’m wondering why the solution requires a space between hotel_rates and the comma. Anyone else come into this issue?

Please help. What’s amiss in the code below:

def calculate_expenses(plane_ticket_price , car_rental_rate , hotel_rate , trip_time):
car_rental_total = car_rental_rate * trip_time
hotel_total = hotel_rate * trip_time-10
print(car_rental_total + hotel_total + plane_ticket_price)
calculate_expenses(200, 100, 100, 5)

1 Like

Did you forget to indent when defining the function?

2 Likes

Can anyone explain to me few moments please?

1.Why we should do here the multiply action?
car_rental_total = car_rental_rate * trip_time

2. Why the output will be different if write the code not this way

hotel_total = hotel_rate * trip_time - 10

but this:

hotel_total = hotel_rate * trip_time
hotel_total =- 10

Thanks in the advance!

I’ll try and answer if I’m understanding your questions correctly:

1: You multiply because the car_rental_total variable is to represent the total cost of renting the car. Industry standard for car rental businesses is to charge clients on a hourly rate. In order to get a cost of a rental, it would require you to multiply the rate (price for renting) by the amount of time the car was used.

2: ‘=’ assigns a meaning to a variable. In your alternative way, by writing hotel_total = -10 you are making the variable literally -10, you arent reducing the total by 10.

By by using hotel_total = a second time, you are rewriting its meaning.

By doing it all in one line:

hotel_total = hotel_rate * trip_time - 10

It will now calculate ‘hotel_rate * trip_time - 10’ together to accurately make the hotel_total variable represent the total cost of the hotel stay.

I hope this explanation helps.

1 Like

I got it.
Thank you a lot for your explanation!

1 Like

I as a practice always use parenthesis when doing multiple calculations. I really think it should be

(hotel_rate * trip_time) - 10

Or at least it should be considered a valid answer. I know there is an order of how the +, _ * / work, but I don’t think I’ll remember them. I just know that hotel_rate * (trip_time - 10) would be very different than the answer you are wanting to get.

The other thing I don’t really understand is that I did
print(str(car_rental_total + hotel_total + plane_ticket_price))
and it wasn’t considered valid? I suppose I only have to use str when mixing different data types?

Thanks,
Halimah