FAQ: Taking a Vacation - Transportation

Frequently Asked Questions Python FAQ
1

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This community-built FAQ covers the "Transportation " exercise from the lesson “Taking a Vacation”.

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This exercise can be found in the following Codecademy content:

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FAQs on the exercise _Transportation _

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3 
def rental_car_cost(days):
  cost = days * 40
  if days >= 7:
    cost -= 50
  elif days >= 3:
    cost -= 20
  return cost

why this code don’t have return in if and elif function and also this code don’t have else why

1 Like
4

we manipulate the cost variable, then at the end function we return the cost.

in this case, we don’t need else, given we always want to return cost at the end of the function

5

def rental_car_cost(days):
cost = days * 40
if days >= 7:
cost -= 50
elif days >= 3:
cost -= 20
return cost

6

taking_a_vacation_mycode
This is my code, but i get an alert?
What did i miss?

2 Likes
7

difficult to say, it seems you nested the rental_car_cost so its not available in the global namespace of the module.

4 Likes
8

Thank you very much. You are right. It was an indentation mistake. Just deleted the space bevore def rental_car_cost(days).

3 Likes
10

your editor have a problem.

File "python", line 17
    return x -= 50
              ^
SyntaxError: invalid syntax
11

This error is thrown by the python interpreter, got nothing to do with the editor.

you do too many operations at once here, you try to re-assign a variable and return the re-assigned variable.

12

Why doesn’t this work?

def rental_car_cost(days):
  if (days >= 7):
    return days * 40 - 50
  elif (days >= 3 and days < 7):
    return days * 40 - 20
1 Like
13

what if the car is rented for two days? That seems to be the most obvious flaw

what error message do you get?

1 Like
14

Why it is not working?
def rental_car_cost(days):

cost = 40 * days

if days >= 7:

return cost =- 50

elif 7 > days >= 3:

return cost =-20

image

15

Here is the code I wrote, but not working, said something wrong with line16
image

16

what is =-? Its assigning a value of minus 50 to the return value. You can’t assign to return value.

17

It should be -=, thanks!

18

If you want to update the variable, yes. But is that really what you want to do?

19

You did not

return cost on line 20 after ‘cost -= 20’

Also, beware that return must be aligned with the if and elif for it to work properly.

20

def rental_car_cost(days):
cost = 40 * days
if days >= 7:
cost -=50
elif days >= 3 and days < 7:
cost -=20
return cost

how come it doesn’t need the “and days < 7” part to not get both discounts?

21

Because the first if statement already checked whether the days were 7 or more. If…elif…else statements evaluate in order, so for the function to reach the elif statement, it assumes that days are fewer than 7.

22

when using if, elif and else, once one of the conditions is met, the remaining conditions are skipped.

so in this case, lets say days = 9, then if is true, so the elif condition never runs. Which is why you don’t need to check that days is less then 7 in elif condition.